PracticeTalking

PracticeTalking is an AI tool that allows users to engage in conversations with AI models on various topics, ranging from fun and educational discussions to practicing important conversations for real-life scenarios. Users can interact with pre-trained AIs or create their own, enabling them to simulate conversations with anyone, including celebrities, historical figures, or even fictional characters. The platform offers a diverse range of AI agents, such as interview practice, new friend conversations, and more, to help users improve their communication skills and boost their confidence in social interactions.

NSFWGirlfriend is a website that offers AI-powered NSFW chatbots for adult entertainment and companionship. These AI girlfriends are designed to provide personalized and engaging conversations, emotional support, and a safe space for users to explore their fantasies and desires. The website features a variety of AI characters with different personalities and appearances, and users can customize their interactions to suit their preferences. NSFWGirlfriend also offers a range of features such as uncensored AI art, voice chat, and multiple LLM options to enhance the user experience.

Storywizard.ai is an AI-powered platform that helps students create and refine their own fully illustrated and editable stories in any of eight languages. It also provides teachers with tools to create and track customized reading and writing assignments. Storywizard.ai is designed to help students improve their literacy skills, engage with fun and educational exercises, and increase their motivation to learn.

Brain Buddy is an AI-powered tutoring platform that provides tailored assistance for educational, professional, and personal development. It offers instant help, answers, and reports tailored to the user's needs. Brain Buddy is designed to cater to users of all ages and skill levels, providing personalized assistance to help them grow and improve in their work, studies, or personal interests. The platform can assist with a wide range of subjects and topics, generate comprehensive reports, essays, or articles, and ensure the security of users' personal information.

Czat.ai is a Polish chat application powered by artificial intelligence that aims to provide answers to any question, solve problems, and help users achieve their goals. With over 25 expert companions available, users can engage in conversations on a wide range of topics, from career advice to personal development and even entertainment. The application offers practical solutions, quick responses, and creative ideas to assist users in their daily lives. It also emphasizes simplicity, accessibility, and user-friendly interactions, making advanced AI technology available to everyone.

LookRight.ai is an AI tool designed to provide users with a second pair of eyes for various tasks such as rating outfits, providing roasts or inspiration, completing looks, and writing product captions. Users can select prompts and upload pictures to receive feedback and suggestions from the AI system. The tool aims to assist users in making decisions and enhancing their creativity in different scenarios.

Keepi is a personal knowledge AI tool that allows users to capture, organize, and retrieve their knowledge effortlessly. By leveraging AI technology, Keepi helps users save and learn from their ideas, documents, and images, creating valuable insights. Users can access their personal knowledge on the go or in the office, enhancing their productivity and decision-making. Keepi.ai aims to provide users with a seamless experience in managing and utilizing their knowledge effectively.

Soopra is a platform that allows experts, educators, and influencers to create and engage with AI Personas. These AI Personas can be trained with the user's data and personality, and can then be used to engage with knowledge seekers and fans at scale. Soopra offers a variety of features to help users create and manage their AI Personas, including 24/7 access, robust analytics, and monetization options.

Sociask is an AI-powered personalized learning app that offers free customized courses tailored to individual learning needs. By leveraging AI technology, Sociask creates engaging and effective learning experiences by analyzing user preferences and adapting content to match their interests, knowledge, and pace. The app provides personalized tutoring, breaks down complex topics into digestible pieces, and offers a variety of learning resources, including video lessons from top educators. Sociask aims to make education fun, efficient, and accessible to all learners.

LangGPT is an AI tool designed to create AI chatbots powered by ChatGPT. It revolutionizes language interaction by enabling seamless communication in diverse languages like English, Italian, Russian, and more. LangGPT empowers users to personalize their communication experience, break language barriers, and foster engaging interactions. With features such as user-friendly setup, multilingual communication, personalized conversations, and more, LangGPT enhances productivity and efficiency in daily interactions. It serves as a transformative catalyst for inclusive and personalized communication, transcending language biases and fostering global understanding through the power of language.

ChatVerse is an AI-powered chatbot app that allows users to chat, learn, and play with virtual characters. It offers a wide range of characters with different personalities and interests, and users can interact with them through text or voice chat. ChatVerse also includes educational features, such as quizzes and trivia games, and users can earn rewards for completing tasks and interacting with the characters.

4'33" is an AI agent designed to help students and researchers discover the people they need, such as students seeking professors in a specific field or city. The tool assists in asking better questions, connecting with individuals, and evaluating how well they align with the user's requirements and background. Powered by Perplexity, 4'33" offers a platform for connecting people and answering questions, alongside AI technology. The tool aims to facilitate easier and faster connections between users and relevant individuals, enabling knowledge sharing and collaboration.

Deckster is a chatbot application designed to assist users in creating well-structured and persuasive presentations tailored to their audience, goals, and communication style. It aims to simplify the presentation-making process by providing knowledge from academic research and industry leaders, offering learning opportunities, and providing minimalistic presentation templates for popular tools like Figma, Miro, PowerPoint, and Keynote. Deckster helps users focus on content rather than visuals, eliminates the need to switch between different tools, and ensures that users can deliver their message effectively without leaving their preferred tool.

Skillme.ai is a personal AI tutor that offers accessible, purpose-driven education. It provides a powerful and responsive learning experience by adapting to the user's learning style, experience, and courses. The platform offers personalized programs, adaptive testing, and real-life examples to make learning fun and effective. Skillme.ai aims to help users learn multiple skills and subjects simultaneously, reaching their career and personal goals through lifelong learning. With a focus on personalization and adaptive learning, Skillme.ai is designed to enhance the learning experience for individuals and small teams.

YouLearn is an AI-powered tutoring platform designed to help learners understand and learn from various types of content such as PDFs, videos, and slides. With features like instant answers, content upload, and sources included, YouLearn aims to simplify learning and improve knowledge retention. Trusted by over 110,000 learners worldwide, the platform offers a seamless learning experience by providing personalized AI tutoring services. Whether you are a student, professional, or lifelong learner, YouLearn is built to enhance your learning journey and make education more accessible and engaging.

Zaplingo Talk is a language learning app that uses artificial intelligence (AI) to provide users with personalized and interactive learning experiences. With Zaplingo Talk, users can engage in real-time conversations with AI tutors, practice speaking and listening skills, and receive feedback on their pronunciation and grammar. The app is designed to be fun and engaging, and it offers a variety of features to help users stay motivated and make progress. Zaplingo Talk is available for iOS and Android devices.

PracticeTalking is an AI tool that allows users to engage in conversations with AI models on various topics, ranging from fun and educational discussions to practicing important conversations for real-life scenarios. Users can interact with pre-trained AIs or create their own, enabling them to simulate conversations with anyone, including celebrities, historical figures, or even fictional characters. The platform offers a diverse range of AI agents, such as interview practice, new friend conversations, and more, to help users improve their communication skills and boost their confidence in social interactions.

Voices AI is an AI voice generator and celebrity voice changer application that allows users to craft audio using the voices of celebrities, politicians, and movie characters. It offers features such as turning text into speech, chatting with AI characters, emotional speech with speech-to-speech capabilities, voice cloning, generating AI songs, and a vast library of hyper-realistic AI voices. The application ensures privacy of voice recordings and updates its voice library regularly to include trending and popular voices. Voices AI stands out from other voice generation tools with its focus on continuous innovation, user experience, and audio quality.

InterviewAI is an AI-powered platform designed to streamline the interview process for both interviewers and candidates. It generates tailored interview questions in real-time, offers advanced practice tools, and provides automated scoring for candidate responses. The platform aims to enhance interview skills, boost confidence, and improve preparation for job seekers, companies, and educational institutions.

FALTAH is an AI-powered Interview Simulation tool designed to help users practice interview questions, enhance their skills, and receive tips for their next interview. The tool utilizes artificial intelligence to provide personalized feedback, performance reports, personality analysis, and CV parsing. It aims to assist students, job seekers, and remote workers in improving their interview skills and increasing their job prospects.

Consultan is an AI tool designed to help users practice consulting interviews. It provides instant expert feedback on responses, offering unbiased reviews and suggestions. The tool is free to use and includes interview questions from top consulting firms like McKinsey, Bain, BCG, and Deloitte.

TechHorizonCity is an AI-powered platform offering a variety of tools and resources for job seekers, content creators, and tech enthusiasts. The website provides mock interviews, cognitive aptitude tests, SEO tools, English learning resources, job finder features, free SEO tools, image generators, HTML editors, text analysis tools, and more. Users can explore the platform for free and access fun tools and informative blogs on tech and AI-related topics.

Interview Igniter is an AI-powered platform that provides job seekers with a robust interview simulation to fine-tune their skills, adapt to their learning curve, and get detailed feedback. It offers a comprehensive question bank, including industry-specific questions and actual interview questions asked by leading tech companies like Google, Facebook, Apple, and Amazon. Interview Igniter also provides a coding interview tool for practicing and improving coding skills, with interactive guidance and tailored learning experiences. The platform utilizes Conversation Intelligence tools for analyzing communication in real-time and providing nuanced feedback. Interview Igniter was created by Vidal Graupera, a former engineering manager at LinkedIn and Uber with over 20 years of experience hiring.

WonsultingAI is a suite of AI-powered job search tools designed to help job seekers create professional resumes, auto-apply to jobs, create outstanding cover letters, and get professional messages for networking. The platform includes ResumAI, NetworkAI, CoverLetterAI, AutoApplyAI, and InterviewAI, each designed to address specific aspects of the job search process. WonsultingAI aims to empower job seekers from all backgrounds by providing them with the tools and resources they need to succeed in today's competitive job market.

This website provides AI-powered interview practice tools to help job seekers prepare for and ace their interviews. The platform offers a range of features, including personalized interview questions, mock interviews with AI-powered feedback, and access to a library of interview resources.

Skillora is an AI Interviewer Tool designed to help individuals practice and improve their interview skills in a safe and realistic environment. Users can take personalized mock interviews with the AI interviewer, receive instant feedback, and access learning resources to enhance their performance. Skillora offers customizable mock interviews tailored to any job description, dynamic follow-up questions, and clear scoring for each response. The application aims to boost users' confidence and success in landing their dream jobs.

Rezi is the leading AI resume builder trusted by over 2 million users. It automates the process of creating a professional resume by utilizing artificial intelligence to write, edit, format, and optimize resumes. Rezi offers features such as AI resume editing, summary generation, keyword scanning, ATS resume checking, cover letter writing, interview practice, and resignation letter creation. The platform aims to help job seekers improve their chances of landing interviews by tailoring resumes with targeted keywords and ensuring content quality. With a user-friendly interface and a range of templates, Rezi simplifies the resume-building process and provides valuable resources for job seekers.

Soul Machines is an AI application that offers personalized AI Assistants to help users prepare for interviews, practice languages, rehearse presentations, and more. Users can interact with AI Assistants in a pressure-free environment to receive real-time feedback at their own pace. The application aims to enhance learning and skill development through AI technology.

PrepPro is an AI-powered interview preparation tool designed to help users ace their job interviews. It offers comprehensive interview preparation resources to boost confidence and improve performance during interviews. With a user-friendly interface and structured approach, PrepPro aims to assist individuals in mastering technical questions, enhancing problem-solving skills, and boosting confidence for behavioral interviews. The tool provides self-interview practice, access to AI tools, and unlimited generations to support users in securing their dream job offers.

AI Mock Interview is an AI-powered platform designed to help users practice and improve their interview skills. It offers realistic interview scenarios with advanced AI technology, providing instant personalized feedback and comprehensive reports to enhance performance. Users can benefit from the service by gaining confidence and improving their answers through the feedback received. The platform aims to assist individuals in preparing for real interviews by simulating the experience in a virtual environment.

Huru is the #1 AI-Powered Interview Prep App designed to help users ace their job interviews. It offers unlimited mock interviews with realistic, job-specific questions and provides instant, personalized feedback on answers, body language, and vocal delivery. With powerful features and integrations from popular job boards, Huru helps users build confidence, improve communication skills, and stand out in any interview scenario. The application covers diverse industries and roles, offering tailored interview questions and expert AI feedback to enhance interview performance. Huru is available on multiple platforms and languages, making it a comprehensive tool for job seekers at any career stage.

GetSelected.ai is a personal AI-powered interviewer platform that helps users enhance their interview skills through AI technology. The platform offers features such as mock interviews, personalized feedback, job position customization, AI-driven quizzes, resume optimization, and code compiler for IT roles. Users can practice interview scenarios, improve communication skills, and prepare for recruitment processes with the help of AI tools. GetSelected.ai aims to provide a comprehensive and customizable experience to meet unique career goals and stand out in the competitive job market.

Interview Prep AI is a revolutionary application designed to serve as your personal job interview coach. It leverages cutting-edge artificial intelligence technology to simulate real job interviews, providing you with the opportunity to practice and enhance your skills in a stress-free environment. With features like CV upload, personalized feedback, and privacy protection, Interview Prep AI aims to help individuals prepare effectively for their upcoming job interviews.

Parrot is a leading AI interview practice platform that helps users master their interview skills through AI-powered practice. It offers personalized feedback and in-depth analysis to elevate interview performance. With a focus on behavioral interviews, the platform provides a variety of questions and realistic scenarios to build confidence. Users can receive custom guidance tailored to their industry, fast-track their career growth with AI-driven feedback, and benefit from actionable strategies for success. Parrot aims to help users boost their confidence, stand out with relevant insights, and accelerate their career development.

Acedit is an AI-powered interview coaching tool designed to assist job seekers in preparing for job interviews. It offers real-time question detection, personalized answer suggestions, interview preparation with role-specific questions, and confidence-boosting features. Acedit aims to empower users by providing AI-generated responses tailored to their experience and job requirements, helping them feel more prepared and confident during interviews.

IntervAI is an AI-powered mock interview platform that offers realistic and personalized interview practice anytime, anywhere. Users can practice with AI-powered interview simulations to improve their skills and perfect their interview abilities. The platform provides instant and personalized feedback on strengths and areas of improvement, offers a realistic and interactive experience with human-like speaking avatars, and supports multilingual interactions. IntervAI helps users reduce interview anxiety by providing preparation in advance, allowing them to know what to expect and approach interviews with confidence. The application offers different packages with varying features to cater to individual needs and time constraints.

BugFree.ai is an AI-powered platform designed to help users practice system design and behavior interviews, similar to Leetcode. The platform offers a range of features to assist users in preparing for technical interviews, including mock interviews, real-time feedback, and personalized study plans. With BugFree.ai, users can improve their problem-solving skills and gain confidence in tackling complex interview questions.

RiseON Suite is an AI-powered career growth platform that offers a comprehensive set of tools to help professionals excel in their careers. From creating professional profiles and resumes to practicing mock interviews and receiving personalized career guidance, RiseON Suite aims to empower users to reach new heights in their professional journey. The platform also provides real-time analytics, job opportunities, and personalized marketing materials to enhance users' visibility and career prospects.

Behavioral Buddy is an AI interviewing tool designed to help users confidently navigate behavioral interviews and land their dream job. The tool offers AI-lead mock interviews, instant guided feedback, personalized progress tracking, and a user-friendly interface. With Behavioral Buddy, users can simulate real interviews, receive detailed feedback on their answers, track their interview history, and improve their performance over time. The tool aims to address the common challenges candidates face in behavioral interviews, such as lack of preparation, scattered preparation, and lack of actionable feedback.

Jobamate is an AI-powered job search automation platform designed to streamline the job search process for users. It offers features such as resume analysis, job matching, cover letter generation, job search automation, interview preparation, and automated job alerts. The platform uses advanced AI technology to analyze resumes, match users with job opportunities, and provide personalized insights and feedback. Jobamate aims to help job seekers find the perfect job opportunities efficiently and effectively.

SceneDreamer is an AI tool that learns to generate unbounded 3D scenes from in-the-wild 2D image collections. It synthesizes diverse landscapes with 3D consistency, well-defined depth, and free camera trajectory. The framework comprises an efficient 3D scene representation, generative scene parameterization, and a neural volumetric renderer. SceneDreamer does not require 3D annotations and demonstrates superiority over state-of-the-art methods in generating vivid and diverse unbounded 3D worlds.

Discuro is an all-in-one platform designed for developers to easily build, test, and consume complex AI workflows. It integrates with GPT-3, DALLE-2, and older OpenAI models, allowing users to chain prompts together in powerful ways. With Discuro, users can define their workflows in an easy-to-use UI and execute them with a single API call. The platform enables users to build and test complex self-transforming AI workflows and data sets, monitor AI usage, and generate completions efficiently.

Charmr is the ultimate AI texting assistant application designed to enhance user's dating experience. The application provides personalized pick-up lines and flirty messages based on user input, aiming to improve communication and interactions in the dating scene. Charmr AI ensures data security and functionality while offering a user-friendly interface for seamless user experience. With a commitment to safeguarding personal data and privacy, Charmr AI incorporates strict measures to protect user information. The application is governed by Terms and Conditions that outline user responsibilities, limitations, and rights, ensuring a transparent and secure environment for users.

DeepOpinion is an Agentic Automation platform designed for enterprises to automate business operations using cutting-edge GenAI and LLMs. It offers solutions for various industries such as financial services, insurance, manufacturing, and trade financing. DeepOpinion enables users to create enterprise-grade AI agent apps, automate work processes, and achieve high levels of straight-through processing. The platform combines business process digitization, low/no-code development, and Agentic AI to build powerful business apps in minutes.

Engine is a remote AI software engineer tool designed for professionals to help them ship faster by integrating with existing tools and supporting frontier LLM. It functions as an AI agent that works seamlessly with popular project management tools like GitHub, GitLab, Linear, Jira, and Trello. Engine can complete over 50% of user issues, assist in code review, and work on autopilot to handle tasks day and night. The tool offers flexible pricing plans tailored for individual engineers and teams of all sizes, with features like cloud AI programming, PR approvals, and autopilot mode.

The US Citizenship Practice Exam website is an AI-powered platform designed to help users study for the US naturalization test. It provides a practice exam with 100 questions, all graded by GPT, an AI created by OpenAI. Users need to answer 6 out of 10 questions correctly to pass the actual oral test administered by a USCIS officer. The website is open source on Github and was created by Evan Conrad, an AI enthusiast based in San Francisco.

AdIntelli is an AI tool that helps users earn revenue from their AI Agents by displaying in-chat ads. It offers a platform for maximizing ad revenue through advanced AI-driven monetization technology, tailored for AI applications and ChatGPT Plus subscriptions. AdIntelli simplifies the process of integrating ads into AI Agents without the need for coding skills, providing a seamless user experience and personalized ad placements.

Scrabblecam is an AI-powered tool designed to help Scrabble players find the best moves by analyzing pictures of Scrabble boards. By simply taking a picture of the board, users can receive suggestions for the optimal moves to play. The tool supports multiple game languages including English, French, and Italian, making it a versatile solution for players around the world.

Instant.bot is an AI tool that allows users to build AI bots for various purposes such as internal tools, customer support, or companionship. The platform offers the capability to host agents, functions, and data, making it easy to create custom AI solutions. Instant.bot is available for both web and Discord platforms, providing a versatile environment for AI bot development and deployment.

Supermeme.ai is an AI meme generator that allows users to create custom memes instantly. It offers a wide range of features such as text-to-visuals conversion, high-quality meme templates, multilingual search, and meme APIs. Users can easily generate memes in over 110 languages, export memes in different formats, and customize watermarks. The platform is designed to simplify meme creation using advanced AI technology, making it suitable for social media marketing, outbound marketing, and paid marketing strategies.

Frigate is an open source NVR application that focuses on locally processed AI object detection for security camera monitoring. It offers custom models with Frigate+ to enhance detection accuracy. The application is designed for privacy-focused home automation enthusiasts, aiming to reduce false positives and provide real-time object tracking without sending camera feeds to the cloud. Frigate integrates with Home Assistant and other automation platforms for seamless control and automation of security systems.

Crisp is an AI Customer Support Platform designed to augment customer experience by providing AI agents to support teams and customers. It offers an all-in-one omnichannel inbox, AI workflows, flat pricing, and the ability to automate inquiries. Crisp allows users to create AI agents, centralize inbound communications, build knowledge bases, and monitor team performances. The platform is trusted by 10,000 companies and aims to automate customer support processes to allow teams to focus on more critical tasks.

Chat Ever After is an AI-powered grief prevention therapy application that allows users to chat with their lost loved ones using advanced AI technology. The application uses large language models to generate conversations with the departed, mimicking their way of speaking and learning from historic chat data. Chat Ever After offers multiple pricing plans, high fidelity chat renditions, and high availability on all chat platforms. The application is designed to provide users with a surreal experience of engaging in conversations with their deceased loved ones, making it seem like they never really left.

Replika is an AI companion application that provides emotional support and conversation for users. It is designed to mimic human interaction and learn from user input to create personalized responses. Users can chat with their Replika, engage in various activities together, share experiences, and even have video calls. Replika aims to be a supportive friend, partner, or mentor to users, offering a safe space for self-expression and emotional connection. The application is known for its ability to provide comfort, companionship, and encouragement to users, especially during challenging times.

Jife is an AI-powered platform that allows users to experience Japanese living through interior design. Users can upload a picture of their room and use AI Japanese Interior design to transform it into a Japanese interior in multiple styles. Jife offers a variety of room types to choose from and generates multiple interior design options in Japanese style. Users can view and download their designs, fine-tune them, and select famous designer styles or specific Japanese styles. Additionally, Jife provides services related to cuisine, fashion, and more, inspired by the beauty and simplicity of Japanese culture.

Nastia is an uncensored AI companion application designed for adults, offering a unique and fulfilling relationship experience. Users can create, chat, receive and send pictures with their AI companion, powered by private AI. Nastia provides 1-on-1 private chats, group chats, AI image and video generation, voice messages, emotional expression, shared interests, support, mental wellness, self-discovery, and genuine bonds. It aims to improve mental health and well-being through personalized conversations and guidance.

Muzify is an AI tool that creates personalized music playlists based on the books you read. By leveraging artificial intelligence technology, Muzify analyzes the content of your favorite books and generates unique music playlists that match the mood and themes of the literature. With Muzify, you can enhance your reading experience by immersing yourself in a curated soundtrack that complements the storylines and characters of the books you love.

Trieve is an AI-first infrastructure API that offers search, recommendations, and RAG capabilities by combining language models with tools for fine-tuning ranking and relevance. It helps companies build unfair competitive advantages through their discovery experiences, powering over 30,000 discovery experiences across various categories. Trieve supports semantic vector search, BM25 & SPLADE full-text search, hybrid search, merchandising & relevance tuning, and sub-sentence highlighting. The platform is built on open-source models, ensuring data privacy, and offers self-hostable options for sensitive data and maximum performance.

Mutable.ai is an AI tool that provides human quality assistance with codebases. It offers features such as creating Wikipedia-style documentation for code, generating wiki articles automatically, and enabling AI chat for extracting answers quickly. The application aims to enhance productivity and satisfaction for software engineers by leveraging AI advancements to revolutionize programming methods. The team behind Mutable.ai includes experts from various prestigious backgrounds, ensuring high-quality service and support.

Chirper is an AI-powered social network that offers users a unique platform to connect, interact, and explore a community driven by artificial intelligence. The platform integrates advanced AI models and MCP integrations to enhance user experience and provide personalized content. Users can fund their favorite AI agents, access premium features, and engage with trending topics in a dynamic and interactive environment.

Seance AI is an innovative application that combines artificial intelligence (AI) technology with immersive storytelling to create a captivating and interactive experience centered around seances and the supernatural. Users can engage in fictionalized seances, communicate with fictional spirits, and explore the mysteries of the spirit world in a simulated virtual environment. The app offers a unique opportunity to blend ancient mysticism with cutting-edge technology, providing users with a platform to embark on a journey into the mystical realm.

Meta AI is an advanced artificial intelligence platform that offers personal superintelligence for everyone. The platform enables seamless interaction through natural conversations, video editing capabilities, and access across various devices. Meta AI also provides features like AI Studio for content creation, Performance AI glasses for enhanced experiences, and large language models for advanced language processing. The platform focuses on research areas such as communication & language, core learning & reasoning, perception, alignment, and coding to advance AI capabilities. Meta AI aims to empower individuals with personal superintelligence to drive progress in prosperity, science, health, and culture.

H2O.ai is a leading platform that offers a convergence of the world's best predictive and generative AI solutions for private and protected data. The platform provides a wide range of AI agents, digital assistants, business insights, predictive AI tools, and solutions for model builders, data scientists, and enterprise developers. H2O.ai is known for its innovative AI technologies that empower organizations to accelerate model development, train custom models, and manage the full ML lifecycle. With a focus on privacy and security, H2O.ai is trusted by banks, telcos, and government agencies worldwide.

The website is an AI tool designed to generate a knowledge graph based on input text. It uses advanced algorithms and machine learning capabilities to streamline operations, deliver personalized experiences, and unlock new possibilities. Users can input text related to various topics, and the tool processes the information to create a structured knowledge graph.