Card catalog for your mind
Drop in tasks, ideas, notes, and things you're learning — the moment you have them. Second Brain files everything so it's there when you need it, not just when you remember to look.
Second Brain, Mind Shelf, Catalog...
Used for doubt, emotion, wishes...
Due before Friday, use new template
Simple enough to use in five seconds, organized enough to actually find things later.
One box for tasks, ideas, notes, and things you're learning. No decision fatigue.
Everything sorts into a category automatically, like a real card catalog.
Find anything by title, content, or tag in a fraction of a second.
Add it to your Mac's Dock like a native app — no App Store required.
Start free. Upgrade when you outgrow it.
Right in your browser, on your device. Nothing is sent anywhere unless you're on Pro with cloud sync enabled.
Yes. Open the app in Safari or Chrome, then use the browser's "Add to Dock" option for an app-like experience — no App Store download needed.
Yes, Pro is billed monthly or annually and you can cancel whenever you like — no long-term contract.
Not yet — the web app already works like one. A native version is on the roadmap.