Trying to find a free AI chat that fits your needs can feel like sorting through a dozen apps that all promise the same thing. This guide compares five top platforms—ChatGPT, DeepAI, Grammarly, Quillbot, and Google Play Chat AI—using official descriptions and real free-tier limits so you can pick the right tool for writing, coding, or just chatting with a character, knowing that every option offers a free tier but strengths vary widely.
AI chat platforms reviewed: 5 · Primary use cases: Writing, coding, character interaction · Free tier available: Yes (all listed) · Mobile app available: Yes (ChatGPT, Google Play app) · Launch year of ChatGPT: 2022
Quick snapshot
- Grammarly’s AI chat is free to use (Grammarly official site)
- DeepAI offers free character chat (DeepAI official site)
- ChatGPT is the most well-known AI chat platform (Zapier, a leading automation platform)
- Future pricing changes for free tiers (Artificial Analysis, an AI benchmarking site)
- Long-term privacy implications of storing conversation history (Harvard University Information Technology)
- Free tiers remain available as of 2025 across major platforms (DataCamp, an education platform)
- New models like GPT‑5.4 are restricted to paying users (DataCamp)
- Deeper integration with mobile and productivity tools expected (Google AI Blog)
- Premium-only advanced features may expand (Artificial Analysis)
Here are the key metrics across the five platforms.
| Metric | Value |
|---|---|
| Top AI Chat Tool | ChatGPT |
| Free Option | Yes (all listed) |
| Mobile App | ChatGPT, Google Play app |
| Best for Writing | Grammarly, Quillbot |
| Best for Characters | DeepAI |
What is an AI Chat?
How does AI chat work?
AI chat uses large language models (LLMs) to generate text based on user prompts. According to Zapier (a leading automation platform), these models are trained on massive datasets to predict and produce coherent responses. ChatGPT, launched in November 2022 by OpenAI, is the most recognizable example, but others like DeepAI and Grammarly use similar transformer architectures.
What can AI chat do?
- Write stories, emails, and social media posts (DeepAI official site)
- Generate and debug code (DataCamp, an education platform)
- Act as a brainstorming partner for creative projects (Quillbot official site)
- Answer questions and recommend next steps (Google Play listing)
The implication: one tool rarely does everything well, so matching the right platform to your main use case matters.
What are the different types of AI chat?
What is a free AI chat?
Free AI chat options include ChatGPT, DeepAI, and Grammarly. While all provide basic access without payment, Artificial Analysis (an independent benchmarking site) notes that free tiers often have smaller context windows and may lack web search or file uploads. For example, ChatGPT’s free tier gives limited access to advanced models before falling back to GPT‑4o mini, according to DataCamp.
What are AI chat characters?
AI chat characters let users role-play or engage in themed conversations. DeepAI is the standout here, explicitly describing its service as an “AI chatbot that writes text” and supporting character interactions (DeepAI official site). Other platforms, like ChatGPT, can also adopt personas but are not designed primarily for character chat.
How does Google AI Chat work?
Google’s AI chat is branded as Gemini (formerly Bard) and integrates with Google services. According to Google AI Blog, it is available through a web interface and the Google Play app, with a free tier that includes limited Deep Research capabilities. The Google Play Chat AI app, specifically, is a separate assistant that answers questions directly from Android devices (Google Play listing).
Character chat and general assistant chat serve different audiences. If you want to explore fictional worlds, DeepAI fits; if you need a productivity helper integrated with your calendar and email, Google’s ecosystem wins.
This distinction helps narrow down the best tool for each user.
Which AI chat app is the best?
What is the best AI chat app?
No single platform dominates every category. Zapier’s 2025 roundup names ChatGPT as the best general‑purpose chatbot, while Claude is praised for writing and coding, and Gemini for integration with Google products. For our focus on writing, coding, and character chat:
- ChatGPT excels at advanced reasoning and everyday conversation.
- DeepAI specializes in character chat and code generation.
- Grammarly is optimized for polishing your writing.
- Quillbot acts as a research companion and email drafter.
- Google Play Chat AI offers a lightweight Android assistant.
Before diving into specifics, consider how these five stack up on the features that matter most.
| Feature | ChatGPT | DeepAI | Grammarly | Quillbot | Google Play Chat AI |
|---|---|---|---|---|---|
| Free tier | Yes | Yes | Yes | Yes | Yes |
| Mobile app | iOS & Android | No | iOS & Android | Web only | Android |
| Character chat | Limited | Yes | No | No | No |
| Code generation | Yes | Yes | No | No | Limited |
| Writing polish | Good | Basic | Excellent | Good | Basic |
What are the differences between AI chat platforms?
The differences go beyond free tiers. Artificial Analysis highlights that premium plans range from roughly $15 to $25 per month for standard access, while top‑tier plans (ChatGPT Pro, Claude Max, etc.) can reach $200–$300 per month. Free tiers often limit context length and advanced features like web search. For Harvard students, Harvard University Information Technology offers an AI Sandbox with free access to multiple LLMs, including chat, writing editing, and image generation.
Free users get powerful tools, but the best features—like unlimited deep research or the newest models—are locked behind subscriptions. That’s fine if you only need occasional help, but power users should budget $15–$25/month.
Users should evaluate their budget and usage frequency before committing.
Where can I use AI chat online?
Can I use AI chat on mobile?
Yes. ChatGPT has dedicated apps for iOS and Android, and Google Play Chat AI is available directly from the Google Play Store. Grammarly also offers mobile apps. According to DataCamp, Gemini Live is free on Android and iOS, providing a voice‑first experience.
Is AI chat available for free online?
All five platforms reviewed here offer web‑based free access. No credit card is required for the basic tiers. Zapier confirms that even premium‑leaning tools like Perplexity and Meta AI have free plans, though with usage limits.
Is AI chat safe?
Are AI chats private?
Privacy varies. ChatGPT stores conversation history by default (OpenAI Privacy Policy), and Grammarly’s AI chat processes your text to improve suggestions (Grammarly Privacy Policy). Google’s Gemini logs interactions according to its data policy (Google Privacy Policy). The consensus from Harvard University IT and other institutional guidance is simple: avoid sharing sensitive personal information, and review each platform’s data handling before use.
Upsides
- Free access to advanced language models for everyone
- Mobile and web availability means you can chat anywhere
- Wide range of use cases: writing, coding, research, role‑play
Downsides
- Privacy concerns due to conversation storage and data processing
- Accuracy can vary; models may hallucinate or produce biased content
- Best features are often locked behind paid subscriptions
“ChatGPT is your AI chatbot for everyday use.”— OpenAI (ChatGPT official site)
“Unlock your writing with Grammarly’s free AI chat.”— Grammarly official site
“AI Chat is an AI chatbot that writes text.”— DeepAI official site
“AI Chatbot is your new writing partner, personal assistant, and research companion.”— Quillbot official site
For the average user looking to improve writing or automate simple tasks, the decision comes down to fit. Grammarly is unbeatable for polishing prose; DeepAI is the only free option that truly leans into character chat; ChatGPT remains the reliable all‑rounder; Quillbot shines as a drafting companion; and Google Play Chat AI fills the quick‑assistant role on Android. The pattern: pick your primary need first, then check the free tier limits. For students and professionals, starting with a free account and upgrading only when you hit the ceiling of context or features is the smartest path.
For a broader overview of how AI chat works and the best free options, check out this free AI chat guide.
Frequently asked questions
Can I use AI chat for job applications?
Yes. Many platforms, especially ChatGPT and Grammarly, can help draft and proofread cover letters and resumes. However, always review the output for accuracy and originality.
Is AI chat better than human writing?
AI chat excels at speed and volume but lacks true creativity and context awareness. For polished, unique content, human editing is still essential.
Do AI chats remember past conversations?
Most do, within the same session or logged history. ChatGPT and Grammarly store conversation history unless you delete it or use incognito mode. Check each platform’s privacy settings.
Can I use AI chat in my native language?
Yes. ChatGPT, Gemini, and DeepAI support multiple languages. Their training data includes many non‑English languages, though performance may be stronger in English.
How much does a premium AI chat subscription cost?
Standard premium plans range from about $15 to $25 per month. High‑end tiers like ChatGPT Pro or Claude Max cost around $200 per month.
Are AI chat responses always accurate?
No. Models can generate plausible‑sounding but incorrect information—a phenomenon known as hallucination. Always verify critical facts from primary sources.
Can AI chat generate images?
Some platforms can. ChatGPT Plus integrates DALL·E, and DeepAI offers image generation. Grammarly and Quillbot focus exclusively on text.
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Hannah Walsh covers federal and provincial politics and public policy for Canada Scope.