Ptero

Ptero is a free, open-source AI chat platform that provides access to multiple powerful language models without requiring sign-up or payment. The service prioritizes user privacy by keeping all conversations stored locally in your browser rather than on remote servers. Users can simply pick a name to start chatting immediately, and their conversation history is preserved on their device for future sessions.

Key features include local-first privacy where chats remain in the browser and are never stored on servers, support for multiple AI models, and optional cloud storage only for projects and custom files. The platform is completely free and non-profit, with a commitment to never introduce paid tiers or paywalls. Ptero supports 20+ languages, making it accessible to a global audience.