skip to content
secondbrain
a personal wiki for the ai era

Your AI forgets you. We make sure it doesn't.

A wiki you own. Any AI reads it, every chat. Every write waits for your tap. Private stays private. No app to install.

text our agent or sign up with your phone
send to [email protected] — body pre-fills hey secondbrain 👋
three steps
  1. 01
    scan or tap

    your texts pre-fill — hey secondbrain 👋. send it.

  2. 02
    we reply

    one link back — your install prompt and your private home page, on one page. save it; that's your sign-in too.

  3. 03
    paste into your AI

    your wiki is now part of every chat. it'll text you to approve writes.

on ownership

Your wiki is a folder of markdown in an Obsidian vault you control. Export it. Walk away. Delete it. We don't trade access for retention — friction is the feature.

Backed by Mesa. Public pages render at /u/<you> — only the ones you opt in, per page.