Himawari CIRCUIT: Lap Timer

Himawari Circuit turns a day at the track into something you can look back on. It brings a GPS lap timer and a driving data logger for motorsport together in one app.

It times your laps with GPS and records your driving line, speed and G-force together. After the session you can see, on the map, where you were quick and where you lost time.

Use it for track days, sport driving sessions, time attack, laps at small circuits and karting tracks, and autocross practice. It works for cars and for motorcycles.

No account needed: lap timing and recording work right away. Sign up to keep sessions in the cloud through a phone change. Premium is free for 3 months for new subscribers.

AUTOMATIC LAP TIMING

Every time you cross the control line, a lap is recorded, along with sector times, top speed and average speed. Each lap time is announced out loud, so you never have to look at the screen while you drive.

Times are interpolated between GPS fixes, so a lap is not lost when there is no fix at the moment you cross the line.

DRIVING LINES YOU CAN COMPARE

Your line is drawn on the map, colored by speed or by G-force, so you can see where you are on the power and where you are not turning.

Lay your own earlier runs over it, or line up runs from friends in the same group. In replay, up to four cars move at once, so you can watch the gap open up.

YOUR SESSIONS ARE KEPT FOR YOU

Sessions upload automatically when you finish. With no signal they stay on your phone and go up once you are back online. Your history can be filtered by track and by vehicle.

VEHICLES AND TIRES

Record sessions per vehicle, with maintenance records and tire details, so you can trace how a setup changed your times.

WITH YOUR FRIENDS

Create a group to share sessions and leaderboards with its members. Live timing shows where your friends are on track, and their lap times, as they drive.

EXTERNAL GPS RECEIVERS

Works with RaceBox and DigSpice IV. A phone's built-in GPS updates about once per second; an external receiver updates far more often, which makes lines worth comparing. If the connection drops, recording falls back to the built-in GPS, so nothing is lost.

WHAT YOU CAN TIME

Circuits and closed courses, and point-to-point runs such as hill climbs, where the start and the finish are set as separate lines.

On a course registered as a circuit, a lap must be at least 30 seconds to be recorded. A point-to-point run must be at least 3 seconds.

Track not listed? Request it from the app.

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PLANS

The free plan covers lap timing, session recording, the track list and leaderboards, and cloud sync of your sessions.

Paid plans are monthly. Each period is one month and renews automatically until you cancel. Cancel in your Google Play subscription settings. Prices and what each plan includes are shown on the plan screen in the app.

Only Premium has a free trial (3 months). Cancel before it ends and you are not charged.

- Lap Pro - compare your own driving lines, session replay, the speed chart in the comparison view, CSV export, tire and maintenance records, and notes after each session
- Drivers Club - groups and chat, live timing to share and watch, leaderboard listing, and visibility settings
- Premium - everything above, plus laying your friends' driving lines over your own

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BEFORE YOU DRIVE

This app is meant for race tracks and other places where driving at speed is allowed. Set it up before you drive, and never operate your phone while driving. It does not encourage speeding or unlawful driving on public roads.

The times shown are estimates based on positioning. They are not guaranteed to match official timing.

Your location is recorded only while the app is on screen. It is never collected in the background.

You must be 18 or older to use Himawari Circuit.

Privacy Policy: https://circuit.himawari-tech.jp/legal/privacy?lang=en

Recent changes:
[New]
- Vehicle timeline (Premium): sessions, tires and maintenance, oldest first, with photo thumbnails. Open it from the vehicle detail header.
- Timeline movie (Premium): plays that timeline, with your best lap at each track behind it.
- Keep one photo with each session debrief (Lap Pro and above).

[Fixed]
- Segment tracks: turning back after the finish could add the turnaround to the next lap.
- Unreadable dates in the maintenance date picker.
- Some fields could not be saved when full.