I built the app I trust with my own memories.

For years I was a second-brain person. Notion, Obsidian, Evernote, OneNote, Apple Notes. At the start it feels great. You capture everything that matters: articles, meeting notes, voice memos, the highlights of the books you read. Every piece of the day you didn't want to lose lands somewhere safe.

Then the years pass. The vault grows. The tags multiply. You start organizing the organization. A search that should bring back one note brings back forty. The system that was supposed to be your memory becomes another thing to manage.

I still love the second-brain idea. But notes are a record of what you thought worth writing down. They are not a record of what happened.

When I started building Stonekept, I wanted something closer to how my brain actually remembers a day. Not the articles I clipped. Not the notes I typed. The thing someone said in passing that I want to recall three weeks later. The decision we made on a call. The name of the person I just met (I'm terrible with names).

You hit record when something matters: a conversation, a meeting, a long walk where you think out loud. A model I trained, running on your device, pulls out the moments your brain would normally hold onto. Decisions, facts, tasks, preferences, and the reasoning behind them. You review them at the end of the day, keep the ones you want, and they go into a memory you can actually search in plain language. Ask for "the time we talked about the camping trip" and it comes back. Hand the result to Claude when you want help with it, or use the on-device AI yourself.

I sometimes call Stonekept my first brain. Not because it replaces a second-brain tool (use both if you like), but because it sits closer to my actual life than a folder of saved articles ever did.