Second brain

A second brain that doesn't just store — it acts

Most second-brain apps are a beautiful place to put things and never look at them again. Squirrel Brain captures the way you think and then does something with it.

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The Burrow in Squirrel Brain answering a plain-language question from everything the user has captured

Storage isn't the problem

You don't need another place to put things

Notebooks, notes apps, and bookmark piles are great at storing and terrible at reminding. The hard part was never writing it down — it's getting the right thing back at the right time. A second brain that just stores is a filing cabinet you forget to open.

Capture → act

It turns what you capture into action

Speak it, snap it, or screenshot it, and Squirrel Brain sets the alarm, adds the calendar event, files the photo, and calls you when something can't slip. The information doesn't just sit there — it moves things forward.

Voice notes, photos, screenshots, and forwarded messages all become action
Ask your captured memory questions in plain language
Reminders, alarms, and calendar events, not just stored text

Talk to it both ways

A memory you can talk to — and that talks back

Ask "what did I say I'd do for Mom this week?" and your squirrel answers from everything you've captured. And through a built-in MCP server, AI assistants like Claude and ChatGPT can use your second brain too — reading your day and setting things up on your behalf.

One app for everything you don’t want to forget

Second brain is one of the things Squirrel Brain does. The Squirrel Brain AI reminder app turns voice notes, photos, screenshots, texts, and emails into reminders, alarms, notes, and calendar events — then makes sure you follow through.

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Common questions

Questions, answered

What makes Squirrel Brain a second brain?

It captures the things you'd otherwise forget — by voice, photo, screenshot, or forwarded message — keeps them searchable, and lets you ask questions in plain language. The difference is that it also acts on them, setting reminders, alarms, and calendar events.

How is it different from a notes app?

A notes app stores text until you go find it. Squirrel Brain acts: it sets alarms, adds calendar events, organizes photos, and reaches out to you when something matters — so things actually get done, not just recorded.

Can my AI assistant use it?

Yes. Squirrel Brain has a built-in MCP server, so AI assistants like Claude and ChatGPT can read your day and set reminders, notes, and alarms on your behalf. Setting up an agent is optional — the app works great on its own.

What device does it run on?

iPhone, for now. Squirrel Brain is pre-launch — join the launch list to get early access.

Stop trying to remember it all

Join the launch list — we’ll email you the moment Squirrel Brain is ready.