Content rating
Everyone
5+
Downloads
88% off•Offer ends 10/14/26, 7:59 PM
Content rating
Everyone
Learn more
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image

About this app

Second Brain is a journal for capturing thoughts and organizing plans in one place.

Capture your thoughts
Write an entry or record a voice note on your phone. Voice entries can be transcribed so you can revisit them as text.

Review your day
Browse your journal by date, search entries using text or voice, and choose to generate an AI summary of your day. Review AI-generated text for accuracy.

Keep track of tasks
Add to-dos yourself or review tasks drawn from your journal entries. Mark tasks complete as you go.

Plan with Google Calendar
Optionally connect Google Calendar to create new events from dated plans you capture. Second Brain does not read, edit or delete your existing Google Calendar events.

Find the privacy policy, terms and account deletion information in Settings.
Capture thoughts by voice or text, then review summaries and to-dos
Updated on
Sep 29, 2026
Featured stories

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • No data shared with third parties
    Learn more about how developers declare sharing
  • No data collected
    Learn more about how developers declare collection
  • Data is encrypted in transit
  • You can request that data be deleted

What’s new

- Create Google Calendar events from the Calendar screen or journal entries.
- Improve event and task forms, validation, and error handling.
- Add Light, Dark, and System appearance settings.
- Add account, privacy, terms, and account-deletion settings.
- Second Brain creates requested events; existing events remain managed in Google Calendar.