Privacy policy
Effective November 12, 2026
The short version: Gas Math collects nothing about you. There is no account, no ads, no analytics, no tracking and no third-party code in the app.
Your drives are recorded and kept on your iPhone. They leave it only when you share them, or when you turn on household sharing through your own iCloud.
What the app records on your phone
While you drive, Gas Math records:
- Engine readings from your OBD adapter: speed, engine speed, throttle, intake pressure and temperature, coolant temperature, fuel level and battery voltage. It also reads check-engine codes.
- Your route from the iPhone's GPS: location and speed.
- Motion from the iPhone's motion sensors (acceleration and rotation), and air pressure from its barometer, to measure cornering, braking and hills.
- An adapter log: when the adapter connected, slept and woke. While it searches for your adapter, the log also notes the names of other Bluetooth devices nearby.
You can also enter fill-ups (date, litres, cost, odometer), business trips for the mileage log (destination and purpose), tire changes, a driver name and your settings. These stay on your phone too.
Gas Math does not read your car's VIN (vehicle identification number). It never asks the car for it.
Where it's kept
Everything above is stored in the app's own storage on your iPhone. You can see the drive files in the Files app under On My iPhone › Gas Math.
Like any app's data, it is included in your iPhone backups (iCloud Backup or a computer) if you use them. Those backups are yours and are handled by Apple.
To delete a drive, long-press it and tap Delete drive. To delete everything, delete the app.
Permissions
| Permission | Why |
|---|---|
| Bluetooth | To connect to your OBD adapter and read speed, engine speed and throttle. |
| Location, while using the app | To record your route and speed during a drive, for cornering and replays. If your phone locks mid-drive, recording continues until the drive ends. Your location stays on your phone. |
| Motion & Fitness | To measure cornering with the motion sensors, and hills with air pressure, so climbs and descents are scored fairly. |
You can turn any of these off in iPhone Settings. Without an adapter, Gas Math uses the phone alone. The app does not use your camera, microphone, contacts or photos.
Household sharing (optional)
If you link another driver of the same vehicle, Gas Math shares through Apple's iCloud (CloudKit). It's off until you send or accept an invite.
What's shared, only with the drivers you link:
- Drive summaries: start time, length, distance, how smooth the drive was, best streak, and estimated fuel used and wasted.
- Fill-ups: date, litres, cost and odometer.
- The driver name you entered.
No GPS, no routes, no motion data and no raw logs are shared. The data sits in the inviting driver's iCloud, under Apple's privacy policy. We can't see it.
To stop, unlink in the app. You can also send the same summaries as a file instead of using iCloud.
When you share files
Some features hand files to the iPhone share sheet: Share log files on a drive, drive postcards, the mileage export and the household file. Files go only where you send them.
Note that a drive's log files include its GPS route, engine readings, motion data and the adapter log. Share them only with people you trust.
What we receive
Nothing, unless you contact us or send us files. If you do, we use them only to answer you and fix problems, and delete them when we're done.
This website
gasmath.ing uses no cookies, analytics or tracking scripts, and loads nothing from other sites. It is hosted by Cloudflare, which handles standard request data (such as IP addresses) to deliver the pages.
Children
Gas Math is made for drivers. It is not directed at children.
Changes
If this policy changes, we'll update it here and change the date at the top.
Contact
Questions about privacy: support@gasmath.ing