
Second Brain - AI Note
Notes, tasks & calendar in one
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Free
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About
Manage notes, to-dos, and your schedule in one app.
Capture thoughts as notes, actions as to-dos, and anything with a date on the calendar. No more hopping between apps.
■ Notes
Write fast, organize later. Sort into folders and find anything with search. Share only the notes you choose via a link, and unshare with a single tap.
■ To-Dos
Set due dates and repeat rules. See what's left with D-Day countdowns, and group tasks by category.
■ Calendar
See to-dos and events on the same screen. Switch between month and week views to check how full your week is.
■ Widgets
Check today's tasks from your Home Screen and Lock Screen. See what's left without opening the app.
■ Notifications
Get notified as deadlines approach. Start the day with a morning briefing and wrap up with a daily summary.
■ AI Organize
Pull action items out of long text. Turn copied text into to-dos. Gather past records into a retrospective.
AI features are free up to 3 times per month. To use more, connect your own AI API key.
■ Same content on every device
Notes written on iPhone open on the web too. Sign in once and your content follows you across devices.
■ Privacy
AI features only process text you explicitly send. See the privacy policy for details.
https://docs.ainote.dev/legal/privacy
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What's New in Second Brain
1.0.1
August 22, 2026
• Japanese, Traditional Chinese, and German are now supported. Pick one in Settings › Language and the app and widgets follow. • Change the accent color and the whole app follows. Six presets in Settings › Appearance. • Fixed tab names and date formats so they follow the language you picked.
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