I built an open-source ChatGPT alternative where the "Open" isn't just marketing

Description and use

GptOpen is an open‑source AI chat app that lets users create agents and use any API key without accounts or a database.

Problem

Existing open AI chat apps require sign‑ups, data hand‑over, and impose markup or credit systems.

Outcome

GptOpen provides a fully open, privacy‑first chat experience that supports any API model and eliminates provider markup.

Workflow

• Create an agent with name, avatar, instructions, personality
• Select an API model and paste your key in Settings
• Chat solo or add agents to a group chat
• The app relays API calls via a serverless function with automatic failover

Evidence

GptOpen works with any API model: Groq, OpenRouter, Gemini, Mistral, NVIDIA, DeepSeek, Kimi

Source

No accounts. No database. Your API keys and chats stay on your device.

Source

The only thing that ever leaves your device is the API call itself.

Source