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Second Brain OS
Your private Second Brain — offline
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.
Top comment
Hey Product Hunt! 👋 I built Second Brain OS after getting frustrated with every productivity app storing my private journal entries on their servers. It’s a single HTML file that works in any browser on any device — mobile, PC, Mac, everything. No account, no server, no subscription. Your data never leaves your device. It has 6 sections built around the PARA method: 📥 Inbox — capture anything instantly 🎯 Projects — track with progress bars 📚 Resources — personal knowledge library 💡 Ideas — Spark → Shipped kanban board 📓 Journal — daily prompts, fully private 🔒 100% offline — private as a notebook One $17 payment. Yours forever. Happy to answer any questions about how it’s built, the PARA method, or anything else. Would love your honest feedback! 🧠
About Second Brain OS on Product Hunt
“Your private Second Brain — offline”
Second Brain OS was submitted on Product Hunt and earned 4 upvotes and 1 comments, placing #110 on the daily leaderboard. 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.
On the analytics side, Second Brain OS competes within Productivity, Task Management and Privacy — topics that collectively have 747.5k followers on Product Hunt. The dashboard above tracks how Second Brain OS performed against the three products that launched closest to it on the same day.
Who hunted Second Brain OS?
Second Brain OS was hunted by MJ37. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Second Brain OS including community comment highlights and product details, visit the product overview.