boxbox vs RaceChrono: an honest lap timer comparison

RaceChrono Pro is the veteran of phone lap timing: in development since 2007, $19.99 one-time, a 2,600-track library and the broadest hardware support of any lap timer app. boxbox is the challenger: a race engineer for karting, formula and GT racing that treats lap times as the starting point, not the product. It speaks your delta into your helmet, lets friends watch your session live from anywhere, and replays every lap on the map. The short version: if you want raw data channels and video overlays to study yourself, buy RaceChrono. If you want answers while you drive, and people watching while you get them, boxbox is built for you.

This comparison is written by the boxbox team, so read it with that in mind. Every claim about RaceChrono below links to its official site, forum or store listings, and where RaceChrono is better we say so plainly. We respect it enough that we validated boxbox's own timing engine against RaceChrono and official track timing before shipping it.

What is RaceChrono?

RaceChrono is a lap timer and data logging app made in Finland by RaceChrono Oy, in development since 2007. It predates the modern smartphone: its site still archives builds for Nokia Series 60 and Windows Mobile. The paid version, RaceChrono Pro, costs $19.99 once per platform (Android and iOS are separate purchases that cannot be transferred) and adds predictive lap timing, video overlays and data export. A cut-down free version exists on Android only.

Its hardware support is genuinely unmatched among phone apps: RaceBox Mini, Mini S and Micro, Dragy, VBOX Sport, Qstarz and Garmin GLO GPS receivers; OBD-II readers at up to roughly 50 Hz on Android; CAN-bus logging with custom channels; even a documented Bluetooth API for DIY devices. It ships 2,600+ pre-made track maps, exports to CSV, VBO, NMEA, GPX and ODS, and its GoPro remote control plus overlay export is the reference for phone-based track video.

It is actively maintained (version 10.2 shipped in June 2026) and holds a 4.7-star rating on both app stores, with over 500,000 downloads of the free Android app. This is a good, trusted, mature product. The gaps below are structural, not signs of neglect.

What is boxbox?

boxbox is a lap timer and race engineer for your phone, built for real-world circuit racing: karting, formula and GT. It does the timing you would expect (laps, sectors, personal bests, a live predictive delta against your best clean lap) and then does the part no logger does: it talks. Lap times, sector splits and your delta are spoken into your helmet as you drive, and boxbox deliberately waits for a calm piece of track before saying anything.

You can start with zero hardware: your phone’s own GPS is a first-class telemetry source, and boxbox grades every sample so marginal GPS can never corrupt your reference lap. When you want precision, the 25 Hz RaceBox Mini S (the same device RaceChrono recommends) is the plug-in upgrade.

Around the driving sits the part we think phone lap timers forgot: people. Friends get a push when you go on track and can watch your session live from anywhere, every session replays on the map, and heart rate from your Apple Watch attaches to the story of your day. All social features are free, permanently. That is a product rule, not a launch promo. boxbox is free to download for iPhone, with Android coming soon.

boxbox vs RaceChrono: side-by-side

As of August 2026: RaceChrono Pro v10.2 against the current boxbox release. "Coming soon" means exactly that: on the roadmap, not shipped.

What does RaceChrono do better?

• Video. GoPro remote control, picture-in-picture, hardware-accelerated overlay export. If a data overlay on your onboard footage is the goal, buy RaceChrono. Nothing else on a phone touches it.
• Car and bike data. OBD-II and CAN-bus channels (throttle, brake, RPM) are the right tool when you want vehicle electronics in your data. boxbox times any class from karts to GT cars, but it reads GPS telemetry today; more vehicle data channels are planned.
• Hardware freedom. A dozen supported GPS receivers plus a DIY device API, against two devices in boxbox today (your phone or a RaceBox). More devices are on the way, and you can request yours through boxbox support.
• Export formats. CSV, VBO, NMEA, GPX and ODS cover practically every third-party analysis tool. boxbox exports your data too, in fewer formats.
• One-time price. RaceChrono Pro is $19.99 once, per platform. boxbox’s free tier is genuinely usable, but its coaching layer is a subscription.

Where does RaceChrono fall short?

None of what follows is invented; all of it comes from RaceChrono’s own forum, documentation and store reviews, most of it acknowledged by the developer himself.

Your data lives and dies on one phone

There is no account and no cloud. Moving sessions to a new phone means manually creating a backup file and shuttling it through your own Google Drive or iCloud, and the official documentation notes video files are not included. Users asked for automatic cloud sync in 2022; the developer answered that it was "on my longer TO-DO list". As of v10.2 in 2026, it has not shipped. In boxbox, sessions back up to your account automatically and follow you to any phone you sign in on.

Nobody can watch you drive

A parent in the stands, a coach at the pit wall, a friend at home: RaceChrono has no way to show any of them your session as it happens. Asked on the forum for live timing to the pits in 2021, the developer replied "in the future yes, but no idea when". Five years later the answer is unchanged, and the workarounds are community-built DIY Bluetooth hardware.

The analysis stops at a spreadsheet

RaceChrono records excellent data and then leaves you alone with it. There is no web or desktop app; the developer himself points users at third-party analysis tools, and some run the Android app in an emulator just to see their laps on a big screen. Session organization has fared no better: folders and session merging were requested in 2021, and the developer’s 2024 status was "unfortunately this has not progressed". One karter summed up the end state: after exporting a CSV, they pasted it into ChatGPT because no dedicated tool existed to read it.

It logs; it does not coach

This is the philosophical gap rather than a bug: RaceChrono treats you as the data analyst. Every insight (where you lost time, what to change next lap) is yours to dig out of the graphs after the session. There is no audio feedback while driving, and the closest thing to a coach is whatever you conclude on the couch that evening.

How is boxbox different?

boxbox starts from the opposite assumption: telemetry is the input, answers are the product. A driver mid-session cannot read a graph, but they can hear "three tenths faster" on the straight, and see afterwards exactly which corner paid for it. The replay, the optimal-lap math, the micro-sector comparison against your best lap: all of it exists to answer where the time went, not to hand you channels.

• Live, for free. The live pit wall (friends and coaches watching your session in real time) is the headline feature RaceChrono users have requested since 2021, and in boxbox it is free.
• Social, permanently free. Sharing a lap, following a friend, leaderboards: never paywalled. The "Strava for karting" that r/Karting keeps asking for is the layer we are building.
• A voice, not a dashboard. Deterministic callouts (delta, sectors, lap times) work today, offline, with zero setup. The AI coaching layer on top, with plain-language post-session debriefs and a practice coach that talks you through a stint, is rolling out to Pro subscribers.
• Tracks on the go. boxbox does not need a track library: it adjusts to your location automatically, and you create any track in two taps the first time you visit it.
• Honest roadmap. The Android app is coming soon. We would rather tell you that than pretend. And boxbox has no video overlay and no OBD-II today; if those are dealbreakers, RaceChrono is the right buy.

Which one should you choose?

• Choose RaceChrono Pro if: you want OBD-II or CAN channels from a car or bike, you want video overlays, you export data into your own tools, or you refuse subscriptions on principle.
• Choose boxbox if: you race karts, formula or GT, you want to hear where the time is rather than decode it, you have friends, family or a coach who want to follow you live, or you want your first telemetry session to need nothing but the phone already in your pocket.

And because both apps speak to the same RaceBox Mini S, trying boxbox next to RaceChrono on a track day costs you nothing but a phone mount. We think the session you drive with a race engineer in your ear will make the argument better than this article can.