AI notes and second brain apps
Notes apps that use AI to organize what you capture, answer questions about your notes and turn ideas into plans. We track 4 apps, each checked against official pages with a last-verified date.
| App | Free plan | Paid from* | Platforms | Top AI features | AI training on your notes | Verified |
|---|---|---|---|---|---|---|
| CraftPolished notes and docs app with a built-in AI assistant, good for journaling and planning. | Limited | $6.40/mo | iOS, Web, Mac | AI assistant with monthly credits (50/month on Plus); Choice of AI models (Core, Fast, Max on Plus) | Not used | |
| Saner.AIAI notes and personal assistant built for people with ADHD: dump thoughts, it organizes and plans. | Limited | $8.00/mo | iOS, Android, Web | AI chat over your notes; Auto-organization of notes and tasks | Unknown | |
| CapacitiesObject-based notes app (a 'studio for your mind') with an AI assistant on Pro. | Yes | $9.99/mo | iOS, Android, Web, Mac, Windows, Linux | AI assistant and chat over your notes (Pro); AI autofill of properties | Not used | |
| ReflectNetworked notes and daily journal app with optional AI chat over your notes. | Limited | $8.25/mo | iOS, Mac | Optional AI chat over notes with citations; AI writing and summaries | May be used |
*Lowest annual-equivalent price for the plan that includes the listed features (USD, as published by the vendor; "See notes" means no USD price was published, so check the app page). "ZDR providers" means the vendor says its AI providers are under zero-data-retention agreements. Check the app page for details and sources.
What to check before you pick
- Check whether AI is opt-in, and whether you can turn it off for private notes or journals.
- Look for full export (Markdown or similar) so your notes aren't locked in.
- See how many AI requests the plan includes; several apps meter AI with credits or budgets.
- Confirm the platforms you use every day; some apps are Apple-only.
Comparisons and alternatives
