Live GPS speedometer in your browser — see how fast your bullet train is really going.
Open the link on your phone, tap Start, allow location access, and watch the needle climb toward 300 km/h. No app, no install, no tracking — everything runs locally in your browser.
- Live speed from your phone's GPS (Doppler speed when available, position-delta fallback)
- Max / average speed, distance travelled and GPS accuracy
- Speed history chart (last 5 minutes)
- Auto-scaling gauge — starts at 150 km/h and grows to 350/600/1000 as you speed up; manual override available
- 9 languages, auto-detected from your phone: English, 日本語, Svenska, 简体中文, 繁體中文, 한국어, Deutsch, Français, Español
- mph / m/s / Mach readout
- Milestone confetti at 200, 285, 320 and 500 km/h 🎉
- Tunnel detection — GPS dropouts at speed are flagged as tunnels (you'll see plenty on the Tōkaidō line)
- Screen wake lock so the display stays on
- Installable on iPhone & Android (PWA) — add it to your home screen, works offline
- Share button that includes your current speed
- Global leaderboard 🏆 — submit your top speed and compete today / this week / this month / all-time, with a 30-day trend chart. Entries are the top sustained speed (held within ±2 km/h for 5+ seconds), validated server-side against train physics (acceleration limits, GPS accuracy, trace continuity) to keep spikes and fake entries out. Only a display name, speed and timestamp are stored — plus an optional line label (e.g. Tōkaidō) that is detected on-device from your trace; your position never leaves your phone. A salted IP hash is kept for rate limiting only.
- Works for any train, plane or ferry — not just the Shinkansen (passengers only — never use while driving)
Unofficial fan-made project — not affiliated with JR or any railway company.
- GPS works best near a window
- Speed drops out in tunnels — the value freezes until the signal returns
- Tōkaidō Shinkansen (Nozomi) cruises at ~285 km/h; Tōhoku (Hayabusa) reaches 320 km/h
A single self-contained index.html — no frameworks, no build step. Everything runs locally in your browser; the only network calls are the optional leaderboard fetch/submit and an anonymous daily page-view counter (no IP, no cookies, no fingerprinting — just "N loads per day"). Uses the Geolocation API, Screen Wake Lock API, Web Share API, SVG and canvas. Hosted on GitHub Pages.
poster.html— printable A4 QR posterog.html— social preview image template
MIT — see LICENSE.