This product was not featured by Product Hunt yet. It will not be visible on their landing page and won't be ranked (cannot win product of the day regardless of upvotes).
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.
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! 🧠
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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.
Second Brain OS was featured in Productivity (652.3k followers), Task Management (84k followers) and Privacy (11.1k followers) on Product Hunt. Together, these topics include over 151k products, making this a competitive space to launch in.
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.
Want to see how Second Brain OS stacked up against nearby launches in real time? Check out the live launch dashboard for upvote speed charts, proximity comparisons, and more analytics.
MJ37