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TravelTime Planner calculates a realistic leave-by time for flights and trains by combining your scheduled departure, transit duration, and a practical check-in buffer—so you travel with margin, not stress.
TravelTime PlannerA realistic leave-by time—schedule + transit + buffer
jinhuileft a comment
Hey Product Hunt! 👋 I built TravelTime Planner to answer one simple question: When should I actually leave for the airport or station? It combines your departure time + transit minutes + a practical buffer (with defaults like 90/180/45) and gives you a clear leave-by time in seconds. Your last setup is saved locally so repeat trips are faster. Would love your feedback—what buffers do you use...
TravelTime PlannerA realistic leave-by time—schedule + transit + buffer
Key details:
Uses the browser’s cryptographic RNG (Web Crypto) for fairness
No login / no email — data is processed locally on the device
Mobile-first UI, plus fullscreen mode for projector use
One-tap copy of results
I’d love feedback on: (1) usability on mobile, (2) any confusing wording, and (3) feature requests (e.g., weighting, history, shareable links).
Note: the UI is currently Japanese-first; if that’s a blocker, tell me and I’ll prioritize an English toggle.
抽選・ランダム決定ツールNo-login random decision tools for events & class
jinhuileft a comment
Extra technical detail: randomness comes from Web Crypto (crypto.getRandomValues). I avoided server-side generation so the draw can work offline-ish and doesn’t require sending participant lists to a backend. If anyone wants it, I can add a short “how randomness works” page + a reproducibility note.
抽選・ランダム決定ツールNo-login random decision tools for events & class