Ptero: Free AI Chat with Multiple Models. No Signup.
Ptero is a free AI chat platform for developers with local chat storage, projects, and API access.
About Ptero: Free AI Chat with Multiple Models. No Signup.
Ptero is a free AI chat platform aimed at developers. The homepage describes it as “AI Chat For Developers” and lets users start chatting without signup by choosing a local display name.
The service emphasizes local-first privacy for regular chats. Ptero states that normal conversation history stays in the browser, while Projects are the only chats and custom files stored in the cloud.
Ptero also includes a developer API. The API panel documents personal API keys, bearer-token authentication, chat and streaming endpoints, OpenAI-compatible request parameters, and model IDs that can be used from external apps.
The terms say Ptero is completely free and will always be free, with no premium plans, subscriptions, paywalls, or paid tiers. The app also shows hourly token usage and a GitHub-star option for increasing quota.
Features
- Regular chat history is stored in browser local storage, not Ptero’s server database
- Projects store project title, custom files, and project messages in Ptero cloud storage
- Developer API supports bearer tokens, chat requests, streaming responses, and model selection
- API requests use the same rate limits and token quotas as chat requests in the web app
- Available model IDs include mercury-2.5:free, qwen3.7-flash:free, gpt-5-nano:free, and gpt-6-luna:free
Use cases
- Instant AI conversations without registration
- Exploring different AI model responses
- Private and transparent AI chat experience
- Build simple apps against the documented chat and streaming API endpoints
- Export chats as backups and import them on another device
Screenshots
Frequently asked questions
Do I need to create an account to use Ptero?
No, Ptero allows you to chat with AI models without any signup.
Is Ptero open source?
Yes, the platform is fully open source and its code is available on GitHub.
Can I use multiple AI models on Ptero?
Yes, Ptero lets you interact with several AI models in a single platform.
How long are inactive project files kept?
The Projects notice says inactive project files are deleted after 90 days.
Is GitHub required for API keys?
Yes. The API key panel says GitHub verification is required before a key can be created.
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