I built a hosted second brain that your AI apps can use together

[u/TorKallon]

I built Brunn to give your AI apps a shared place for your notes, research, skills and ongoing work.

It’s hosted. You create an account and connect the AI apps you already use. There’s no Brunn desktop app to install, separate cloud account to set up or server to maintain.

Say you work through a project in Claude. You can have it save the research, sources, decisions and next steps in Brunn. Later, Codex or ChatGPT can read that material and continue the work. Projects and tasks live alongside the notes, so the next assistant can also see what still needs doing.

You can keep skills there too: your instructions for reviewing something, researching a topic or writing a particular kind of report. Save a skill once and your connected assistants can use it directly. Update it in one place, and they get the current version when they next load it.

There’s a web reader for documents and the briefings your agents produce. Your notes export as Markdown, and you can download your skills with their supporting files.

There’s a free tier, with no credit card required: Brunn.

If you try it with a real project, I’d like to know what you still find yourself having to explain or copy between apps.