ANOTESYSTEMFORYOURSECONDBRAIN.
INDEX/04 IS A KEYBOARD-DRIVEN NOTE TOOL FOR RESEARCHERS, BUILDERS AND OBSESSIVES. WRITE PLAIN TEXT. LINK ANYTHING TO ANYTHING. QUERY LIKE A DATABASE. EXPORT LIKE A PRINTER.
WE BELIEVE DATABASES SHOULD FEEL SHARP, DOCUMENTS SHOULD FEEL HEAVY, AND SOFTWARE SHOULD WORK OFFLINE.
splittable
rebindable
per vault
servers
"FINALLY. SOFTWARE THAT DOESN'T ASK PERMISSION TO WORK."
— H.M., DESIGN RESEARCHER, BASEL
CAPTURE
GLOBAL HOTKEY. 120ms FROM THOUGHT TO DISK. PLAIN MARKDOWN, ON YOUR DISK, FOREVER.
LINK
[[DOUBLE-BRACKETS]] OR DRAG. BACKLINKS AUTOMATIC. TYPED EDGES OPTIONAL.
QUERY
SQL-ISH DSL OVER MARKDOWN. FIND EVERY NOTE WITH TAG /books/ CITED IN ANY 2024 ESSAY.
VIEW
LIST / TABLE / BOARD / GRAPH / CALENDAR. ONE VAULT, FIVE LENSES. SWITCH WITH ⌘1–5.
EXPORT
PDF / EPUB / HTML / STATIC SITE. A FOLDER OF .MD WILL ALWAYS BE YOUR ESCAPE HATCH.
SYNC — E2E ENCRYPTED
OPTIONAL PAID RELAY OR BRING YOUR OWN GIT, SSH OR ICLOUD DRIVE. WE DON'T SEE YOUR NOTES. WE DON'T WANT TO.
TECHNICAL
SPECIFICATIONS.
INDEX/04 / DATA SHEET / ISSUE 003 / 2026-04-16
PRICING.
THREE TIERS. NO TRIAL. NO TEASER PRICING.
SOLO
- LOCAL VAULT, UNLIMITED NOTES
- ALL 5 VIEWS
- PLAIN MARKDOWN STORAGE
- EXPORT TO PDF/HTML/EPUB
- NO CLOUD SYNC
PRO
- EVERYTHING IN SOLO
- E2E ENCRYPTED SYNC
- QUERY ENGINE · TYPED EDGES
- WEB CLIPPER · PDF CLIPPER
- PUBLISH AS STATIC SITE
STUDIO
- SHARED VAULTS, FINE-GRAINED ACL
- SSO (OKTA, GOOGLE, ENTRA)
- AUDIT LOG, RETENTION POLICY
- ON-PREM RELAY AVAILABLE
- PRIORITY SUPPORT · PHONE
"SOFTWARE SHOULD BEHAVE LIKE A WELL-BUILT TOOL
— SHARP, FASHIONABLE DURABLE, HONEST ABOUT WHAT IT DOES.
INDEX/04 IS A HAMMER, NOT A PLATFORM."
— FOUNDING MEMO / 2024.11.03 / BY THE FIVE OF US