Launching today
Second Brain OS

Second Brain OS

Your private Second Brain — offline

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Most productivity apps rent you your own thoughts. Second Brain OS is a single HTML file — open it in any browser, on any device, and everything stays on your device forever. No server, no account, no subscription. Just you and your Second Brain.​​​​​​​​​​​​​​​​

Second Brain OS makers

Here are the founders, developers, designers and product people who worked on Second Brain OS

MJ37
MJ37 Building a productivity app
Second Brain OSSecond Brain OS