# Himawari CIRCUIT: Lap Timer — GPS driving lines, track days > GPS driving lines, track days (iPhone/iPad app by masaki dobashi.) - Source: https://appshunter.io/ios/app/himawari-circuit-lap-timer/id6762707429 (this page in markdown: same URL + `.md`) - Developer: [masaki dobashi](https://appshunter.io/developer/1894974641) - Category: Sports - Price: Free - Age rating: 12+ - Requires: iOS 16.4 · 84 MB - Languages: American English, Japanese - Released: 2026-09-28 - Data updated: 2026-10-12 - User reviews in markdown: https://appshunter.io/ios/app/himawari-circuit-lap-timer/id6762707429/reviews.md ## What is Himawari CIRCUIT? Himawari Circuit turns a day at the track into something you can look back on. 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. 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. 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. -------------------------------- 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 App Store subscription settings. Prices and what each plan includes are shown on the plan screen in the app. - 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 -------------------------------- 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. SUBSCRIPTION DETAILS - Premium (1 month): $7.99 - Drivers Club (1 month): $4.99 - Lap Pro (1 month): $4.99 Payment is charged to your Apple ID account at confirmation of purchase. Your subscription renews automatically unless auto-renew is turned off at least 24 hours before the end of the current period. Your account is charged for renewal within 24 hours before the end of the current period. You can manage your subscription and turn off auto-renew in your App Store account settings after purchase. The free trial is available for Premium only. The first month is free, and after the trial it renews at $7.99 per month. Cancel at least 24 hours before the trial ends and you will not be charged. Lap Pro and Drivers Club do not have a free trial. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://circuit.himawari-tech.jp/legal/privacy?lang=en ## Version history (last 5 releases) ### 2.1.0 — 2026-10-07 [New] - Vehicle timeline. Sessions, tires and maintenance records laid out from oldest to newest, with a thumbnail wherever there is a photo. Open it from the header of the vehicle detail screen (Premium). - Timeline movie. Plays your timeline from the oldest entry, with your best lap at each track drawn behind it (Premium). - You can now keep one photo with each session debrief (Lap Pro or above to add one; anyone can view). [Fixed] - On segment tracks, turning back after the finish and crossing the start line in reverse could add the turnaround and waiting time to the next session's lap time. - Dates were unreadable in the maintenance record date picker when the device was in dark mode and the app was set to the light theme. - Vehicle display name, model and color, notes, group name and the inquiry subject could not be saved once you typed up to the allowed length. - The character counter showed a different limit from the one actually enforced. ### 2.0.0 — 2026-09-29 This is the first release of Himawari Circuit outside Japan. NEW - The app is now available in English. You can change the language in Settings. - Tracks outside Japan are now on the track list. Tracks are grouped by country, starting with the nearest country. - You can ask for a track that is missing from the list, from the track map or the track form. - Address search now finds addresses and place names outside Japan. IMPROVED - The plan screen now shows the price, the automatic renewal and how to cancel, right above the purchase button. - The birth year list now opens near a year you are likely to pick. - More characters are allowed in notes, memos, maintenance records and other text fields. - In the session list, your note is now shown next to the date and time. - In the lap timing accuracy notice, "Don't show this again" can be tapped without scrolling to the bottom. FIXED - The track list is no longer lost when your location cannot be found. The track name, lines and legend were missing in session detail, and line comparison could not be opened. - A note written in the edit sheet you swipe open in the session list is now saved. - Coming back from the map after adding a track no longer shows the track form again. - A gap of more than a minute no longer wraps onto two lines when you choose laps to compare. ### 1.4.1 — 2026-09-20 【改善】 ・ 走行履歴を開いたときの通信量を減らしました。走行ラインと速度グラフが出るまでが速くなります。 【修正】 ・ 速度グラフが1周の途中で途切れて表示されることがある問題を直しました。 ・ 1.4.0 に更新すると、デジスパイスⅣ対応や法的通知など 1.3.0 で追加した機能が使えなくなる問題を直しました。 ### 1.4.0 — 2026-09-20 【追加】 ・設定に「法的通知」を追加し、地図のオープンソースライセンスと商標の表記を確認できるようにしました。 【改善】 ・利用規約・プライバシーポリシー・お知らせの行間と箇条書きの表示を整えました。 ### 1.3.0 — 2026-09-19 【追加】 ・外部GPS受信機のデジスパイスⅣに対応しました。 【改善】 ・読み上げをオフにしているときは、走行を始めても音楽を止めないようにしました。 ・走行履歴詳細を開いたときの、地図・走行ライン・グラフの出方を整えました。 ・走行ライン比較で、追従を切ると進行方向アップも切れるようにしました。 ・走行ライン比較で、地図の上のお知らせを閉じても、地図の大きさやボタンの位置が変わらないようにしました。 【修正】 ・iOS で横Gが小さく記録される問題を直しました。 ・RaceBox で記録した横Gの左右が逆になる問題を直しました。これまでに記録した走行の横Gは逆のままです。 ・走行ライン比較で視点のボタンを続けて押すと、再生が止まったままになる問題を直しました。 ・グラフの線を描き始める直前に、一瞬だけ線全体が表示されることがある問題を直しました。 ・プランを乗り換えたときの案内を、実際の切り替わり方に合わせました。 【その他】 ・対応する iOS のバージョンを 16.4 以上にしました。 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-12.*