Open source · Free forever

Your second brain,
quietly organized.

Notes, focus timer, daily logs and a learning tracker — all in one calm place. No subscriptions. No noise. Yours forever.

MIT licensed · Self-hostable · No card needed

brainbase.app

Today

Tuesday · May 8

Notes

124

Streak

12d

Focus

2h 15m

Reviews

8

Recent notes

Compounding knowledge
essay
On deep work
draft
Stoic frameworks
read
The architecture of thought
essay

Focus

17:23
Pomodoro 3/4
The problem

Five tabs open. Three apps installed. Zero clarity.

Most productivity tools are billing engines first and notebooks second. Brain Base is the opposite — yours, local, free, forever. One quiet app you actually want to open at 11pm.

Six tools

Everything you’d open in the morning. Nothing you wouldn’t.

01

Quick capture

⌘K from anywhere. A blank page lit by a single lamp. Start typing — it saves.

02

Notes that link

Write [[double brackets]] anywhere. Watch the wall of your knowledge fill in.

03

Focus timer

A single ring under candlelight. Twenty-five quiet minutes. No leaderboards.

04

Daily log

One page per day. A prompt, a slider for mood. The whole month in the margin.

05

Learning tracker

What you're reading, watching, taking. Progress without the leaderboard guilt.

06

Spaced repetition

An index card under the lamp. SM-2 schedules. Remember the things worth keeping.

Why open

Your second brain shouldn’t be someone else’s product.

MIT-licensed. Self-hostable. No telemetry, no analytics, no signup wall standing between you and the page. Run it on your laptop, on a Raspberry Pi, on a $5 droplet — wherever your notes feel safest.

Free foreverYour data, your machineBuilt in public
Pricing

Free. Actually free.

One tier. No upsells. No team plan dangling above a feature you need.

Always free

Brain Base

$0/ forever

Self-host it, run it locally, deploy to Vercel — your call.

  • Unlimited notes, tags, daily logs
  • Wikilinks + knowledge graph
  • Focus timer & spaced repetition
  • Self-hostable (Postgres or SQLite)
  • PWA installable, offline-friendly
  • MIT licensed — fork it, ship it

Begin.

One quiet page. One blinking cursor. The rest is up to you.