a work a lot with different LLMs (local and remote) and have to test a lot of different prompts and approaches.

So to scratch my own itch, I build a small AI notebook that can run prompts, javascript and markdown in cells of different types (inspired by jupyter). It can connect to OpenAI, Anthropic, Openrouter and Custom (including local) APIs and endpoints.

The Data never leaves your Browser (except for the LLM calls of course), as there is no backend and no accounts and everything is stored locally.

The whole thing is Open Source: https://github.com/grothkopp/ainb You can also host it yourself if you don't trust me (or github) with the instance on ainb.dev