Private AI Notes: Second Brain

Capture any thought in a tap, then ask your own notes and get answers drawn only from what you wrote. It links your related ideas for you. Fully on-device, private.

Your second brain, and it never leaves your phone.

Capture any thought the moment you have it. Type it, say it, or share it in from any app. Second Brain saves it in one tap and quietly links it to the related ideas you already wrote, using Apple's on-device intelligence. Later, you just ask.

ASK YOUR OWN NOTES "What did I decide about the trip?" "What was that book idea?" Second Brain answers in plain words, drawn only from your own notes, and shows the source behind every answer. When it doesn't have something, it tells you, instead of making an answer up.

IT CONNECTS THE DOTS Every capture is matched to earlier notes about the same person, project, or topic. Ideas you forgot you had resurface next to the ones you're writing now, so your knowledge stays organized on its own.

LET IT GO, IT COMES BACK Jot "remind me to call Sam tomorrow at 9" and Second Brain reads the time and reminds you. Offload the task and stop holding it in your head.

SEE WHAT'S ON YOUR MIND Reflect gathers the themes running through your recent notes, grounded in what you actually wrote and never invented.

PRIVATE BY DESIGN Everything runs on your device with an on-device model. No account, no cloud, no tracking. It works in airplane mode, and your notes never leave your device.

WHAT YOU GET Capture by text, voice, and share, ask your notes with sourced answers, and set reminders. Second Brain Pro unlocks Reflect and a gentle daily resurfacing of what matters most.

REQUIREMENTS Second Brain runs on iPhone and iPad, on iOS or iPadOS 26 or later. On devices with Apple Intelligence it uses Apple's built-in on-device model — no download needed. On other devices, a free one-time on-device model download powers it. Everything runs on your device; your notes never leave it.

A Studio AM app. Made in San Francisco.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://studioam.art/apps/second-brain/privacy