STACK://second-brain[ ⌘K ]

the anti-app for your brain

CAPTURE
AT THE
SPEED
OF THOUGHT

No folders. No friction. No lock-in. STACK is a plain-text second brain for people who'd rather think than file. Keyboard-driven, local-first, brutally fast.

~/brain — stack
$ stack new
# opened daily note 2026-05-28

> met w/ team re: [[roadmap]]. big idea:
  link notes like a brain, not a tree.

$ stack links roadmap
  ← 14 backlinks
  ← 3 unlinked mentions

$stack find "second brain"
  37 results · 4ms
✦ plain text✦ local first✦ keyboard driven✦ open format✦ no lock-in✦ backlinks✦ instant search✦ markdown native✦ plain text✦ local first✦ keyboard driven✦ open format✦ no lock-in✦ backlinks✦ instant search✦ markdown native
01$ stack capture

INSTANT CAPTURE

Global hotkey. Type. Done. Your thought is on disk before you finish the sentence.

02$ stack link

[[BIDIRECTIONAL]]

Wrap any phrase in brackets to forge a link. The graph builds itself as you write.

03$ stack grep

FULL-TEXT RECALL

Fuzzy. Boolean. Regex if you want it. Search returns in single-digit milliseconds.

04$ stack sync

LOCAL-FIRST SYNC

Plain markdown on your machine. Encrypted mirror in the cloud. You own the files.

STOP FILING.
START THINKING.

$ install stack — free