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Ngày nay, artificial intelligence (AI) has become popular and known to many people, and many powerful AI tools are available at no cost. These free AI platforms span chatbots, writing assistants, image generators, and more – helping students, creators, and professionals boost productivity.

In the chatbot realm, OpenAI’s ChatGPT stands out: it’s free to use (sign up required) and now offers advanced GPT-4o capabilities even on the free tier.

In fact, “more than a hundred million people use ChatGPT” every week. ChatGPT can handle text, voice, and images (via DALL·E 3) – just ask it what picture you want and it will craft a prompt for DALL·E to generate it.

Other free AI chat assistants include Google Bard (Gemini) – Google’s conversational AI chatbot (opened in 180+ countries to rival ChatGPT) – and Microsoft’s new Bing Chat, which runs on GPT-4 and can search, answer, and chat at bing.com. 

Anthropic’s Claude is another free AI assistant (web chat with voice mode), and Perplexity AI is a free “answer engine” that provides research answers with cited sources. All these chatbots let you ask questions, brainstorm, and get creative help at no cost.

AI Chatbots

• ChatGPT (OpenAI): A leading AI conversational assistant that can answer questions, draft text, code, and even generate images. 
  It has over 400 million weekly active users and ~4.5 billion visits per month. 
  The free tier gives access to the GPT-4o model (via chat.openai.com) with daily usage limits. 
  Users can create custom GPTs or use text-to-image prompts, while advanced features (voice chat, search, etc.) require the paid ChatGPT Plus subscription. 
  ChatGPT remains the most-visited AI tool on the internet.

• Google Bard / Gemini: Google’s AI assistant (formerly called Bard) is free to anyone with a Google account. It supports both text and image inputs and integrates with Google Search and Docs. 
  Google reports Gemini’s free version (Gemini Lite) handles creative tasks, summaries, and research with up-to-date knowledge. 
  G2 notes that Gemini has a 2.47% share of the AI chatbot market – well behind ChatGPT but still popular. 
  Its tight integration into Google’s ecosystem makes Bard/Gemini widely used for casual queries and productivity.

• Claude (Anthropic): Claude is a general-purpose AI chat assistant known for safety and longer-form text generation. 
  Anthropic’s Claude offers a free tier (Claude 3 Opus Lite) that lets users chat, brainstorm, or write with an “easy-to-use interface”. 
  It excels at creative and technical tasks while prioritizing user privacy. Claude’s free plan is attractive for students and professionals who need a more “responsible” chatbot experience.

• Bing Chat (Microsoft Copilot): Built into the Bing search engine and Microsoft Edge, Bing Chat (Copilot) uses OpenAI’s models to provide answers, summaries, and even DALL·E image generation. 
  It’s free for all users with a Microsoft account. Key features include real-time web access (for current information) and integrated workflow with Windows and Office apps. 
  Because it’s web-integrated, Bing Chat is a popular AI assistant for search and productivity tasks.

• Perplexity AI: Perplexity is an AI-powered research assistant that combines live web browsing with conversational answers. 
  Its free tier allows unlimited basic queries and always cites sources. Perplexity is especially useful for fact-checking and research: it returns up-to-date answers with links, making it stand out from generic chatbots. 
  Users often prefer it when they need accurate, sourced information.

• Character.AI: This platform lets users chat with custom “characters” powered by AI (literary figures, celebrities, etc.). 
  It’s free to use (with optional paid upgrades) and has seen explosive growth: as of mid-2024 Character.
  AI had 20 million monthly active users and over 200 million visits worldwide. 
  The app is especially popular among young users who enjoy conversational role-play.

• INVIAI Free AI Chat: INVIAI Chat AI is a free online GPT chat platform that helps you chat directly with leading AI models such as GPT, Claude, Gemini and Grok.
  Users can use it immediately without registration, no credit card required, 24/7 experience with 99.9% stability.
  With a friendly interface, fast processing speed and high security, INVIAI's free AI Chat tool supports content creation, answering questions, studying and working effectively.
  This is the ideal choice for anyone who wants to exploit the power of AI easily and completely free.

>>> Learn more about: Free AI Chat

Writing and Productivity AIs

A number of free AI tools focus on writing and productivity. 

Grammarly is a hugely popular AI writing assistant (used by ~40 million people) that offers a free plan for grammar, clarity, and tone checking. You can install it as a browser extension or use the web editor to polish essays, emails, or social media posts. 

DeepL provides a free AI translator – “millions translate with DeepL every day” – and also offers DeepL Write, a free writing companion that rephrases and improves text.

Free AI summarizers and paraphrasers are also common: for example, QuillBot has a free paraphrasing tool, and Otter.ai provides a free plan (300 minutes/month) to transcribe and summarize meetings in real time. Many of these free tools use large language models to rewrite or condense text, making writing tasks faster.

Image and Design AIs

Visual creativity has its own set of free AI tools. DALL·E 3 (OpenAI) is an AI image generator accessible through ChatGPT: simply describe your idea and ChatGPT will “automatically generate tailored, detailed prompts for DALL·E 3” to create the image. The images you create are yours to use freely.

Another major tool is Stable Diffusion, an open-source model for generating and editing images from text. Stable Diffusion powers many free web interfaces and apps (and can even run locally) – it’s “designed to generate high-quality, detailed images from text descriptions”. Social media creators often use Stable Diffusion via sites like DreamStudio (which offers free credits) or via community tools.

Design platforms have also embraced AI. Canva’s Magic Studio bundles dozens of free AI features (Magic Write, Magic Design, Magic Media, etc.) for images, text, and video.

Canva reports that its AI tools have been used more than 10 billion times to date, illustrating its popularity. Many Magic Studio features are available on Canva’s free plan (for example, Magic Write offers 25 free generations per month). 

Adobe Firefly similarly offers free image, vector, and video generation tools for creators with an Adobe account. These AI design tools let anyone generate social-media graphics, marketing images, or art with simple text prompts – all without paying for extra software.

Audio and Video AIs 

A few free AI tools help with audio and video production.

For example, Runway offers a free tier (with limited credits) for AI video editing: you can generate short video clips or apply visual effects from text or image inputs.

In audio, ElevenLabs provides a free trial of its advanced AI voice synthesis (cloning or text-to-speech), and Otter.ai has a free plan for meeting transcription. 

Murf.ai and Descript also offer limited free tiers for AI voiceovers. These tools let users create podcasts, voiceovers, or video content using AI, without any cost beyond sign-up.

For quick meeting summaries, Fathom is a free AI notetaker that records and summarizes Zoom or Google Meet calls – saving manual note-taking.

Other Popular Free AI Tools

Beyond these categories, there are many other notable free AI tools. 

GitHub Copilot offers a free tier for verified students, helping generate code via AI. 

Hugging Face hosts free chatbot demos (like HuggingChat) and code assistants. 

Character.ai is a free chat platform where you can converse with AI-generated personalities.

In marketing and business, tools like Canva’s AI Writer, Lumen5 (video creation), and Copy.ai (free trial) are widely used.

>>>Click to know:

The role of AI in the digital age

Common Types of Artificial Intelligence

Across industries, free AI utilities now cover everything from text summarization to image editing. Whatever your task, there’s likely a free AI tool available to speed it up.