https://martiansoftware.com/chatkeeper/

I built ChatKeeper because I wanted to treat my ChatGPT history like a local knowledge base, with local-first access to my data.

It’s a command-line tool (GUI in progress) that takes a full ChatGPT .zip export and syncs it with local Markdown files. You can move and rename them freely and they will stay in sync on future runs.

It pairs well with tools like Obsidian and lets you link your own notes to specific conversations or even points within them.

Revenue is modest but growing month over month. It’s a one-time purchase, not a subscription.

Most users so far are researchers and other ChatGPT power users who already live in Markdown or want to do things like curate and compress the context of very long-running conversations.