Nautilus: Dive deep. Block distractions. Journal automatically.

Hey Product Hunt — I'm Hiroto, a first-year software engineer in Japan. I built Nautilus because every focus app I tried was designed for students, not working adults juggling a day job and side projects. Here's what makes Nautilus different: • OS-level blocking via Screen Time API (FamilyControls) — not just a reminder, but an actual barrier. Opening blocked apps shows a custom screen: "Diving now. Surfacing in X minutes." • 3-second thought capture from Dynamic Island or Lock Screen — thoughts that interrupt you mid-session get caught without breaking focus. • Auto dive-log — when you surface, your session is already a journal entry with depth, duration, and captured thoughts. The depth mechanic: you go deeper the longer you focus without temptation. 50 minutes undisturbed = ~50m deep. It never decreases — no punishment, only honest data. No streaks. No red badges. No guilt on zero-day sessions. I built this for myself first. What's the one thing that breaks your focus that no app has solved? Tell me below — I read every reply.