A mileage tracker has to know where you drive. That is the whole point. But there is a big difference between an app that reads your location to do its job and an app that keeps a permanent record of everywhere you have been on a server it controls. The first is a tool. The second is a data business with a mileage feature attached. This article is about telling them apart.
If you drive for a living, your daily routes are unusually revealing: where you live, when you are home, where you shop and see the doctor, the patterns of an entire life. What a tracking app does with that varies a lot, and the cheapest apps often have the most to gain from keeping it.
Why driving data has a price tag
Location history is one of the most valuable categories of personal data. A detailed record of where and when a person drives can be used to infer income, routines, health visits and shopping habits. Two kinds of buyers care about it most:
- Advertisers want to know where you go so they can target you and measure whether their ads sent you somewhere.
- Insurers and data brokers want driving behavior, because how far, how fast and how often someone drives feeds directly into risk pricing.
This is not hypothetical. In January 2025 the Texas attorney general sued Allstate and its data subsidiary Arity, alleging they built a driving-behavior database covering more than 45 million Americans from software embedded in other companies' apps, without proper notice or consent; Allstate has denied the allegations. And in January 2026 the FTC finalized an order barring General Motors and OnStar from sharing drivers' location and driving data with consumer reporting agencies for five years, after finding GM sold the data to third parties, including insurers, without clear consent.
The pattern is consistent: driving data gets collected in one context and monetized in another, and the driver rarely understands the trade.
What "free" tends to cost
When an app is free and well funded, data is often part of the business model. In mileage tracking, the common arrangements are:
- Analytics and advertising SDKs. Third-party code bundled into the app that reports what you do back to analytics and advertising companies. Many apps carry several, and as the Arity case shows, an SDK can collect far more than the app you installed suggests.
- Cloud storage of your routes. Your trips are uploaded to the company's servers so they can be synced, analyzed and, in some business models, aggregated or shared.
- Insurance or lead referrals. Some free trackers earn money by steering you toward insurance products, which means your profile has value to them beyond the app.
None of this is necessarily hidden. It is usually spelled out in a privacy policy most people never read. But with many free trackers, you are not only the user. You are also part of the inventory.
The question to ask any app
Where does my location data physically live, and who else can see it? If the answer is "on our servers," then the company, its partners, anyone it shares with, and anyone who breaches it can potentially see your driving history. If the answer is "only on your phone," there is no central copy to sell or steal.
Cloud tracking vs on-device tracking
| Cloud-based tracker | On-device tracker | |
|---|---|---|
| Where your routes live | Company servers | Your phone |
| Who can access them | The company, its vendors and partners | You |
| Breach risk | A central database of many drivers | No central database to breach |
| Sync across devices | Usually built in | Limited or none |
| Lost phone | Restore from the company's copy | Restore from your own backup or export |
How on-device tracking works
An on-device tracker does the same job in a different place. Your phone reads its own GPS, computes your trips and stores the results locally. The route data never goes to the app maker. There is no server-side database of your driving, because the company never receives it.
That design has a real trade-off: the app maker cannot restore your data, because it never had a copy. On iPhone, your own device backup — iCloud or an encrypted computer backup, under your account — may bring app data back after a lost or replaced phone. But the safest habit is to export your mileage log regularly. The IRS generally expects you to keep tax records for at least three years after you file, and an exported copy keeps that obligation in your hands.
What a privacy-first tracker deliberately does not do
The clearest way to judge an app is by what it refuses to do. A tracker built around keeping your data private tends to draw the same lines:
- No analytics SDKs in the production build, so no third-party code reports your behavior.
- No cloud database of your trips, earnings or tax records.
- No ad networks or tracking pixels, so you are not profiled inside an app you paid for.
- No data sold or shared with brokers or insurers, because the company does not hold the data in the first place.
- No account required in some designs, so there is no email list or credential database to leak.
MileShield is built on these lines. Location is read on the device to compute your miles, trip data stays on your iPhone, and the app does not run analytics SDKs or sell your driving to anyone. The only data that leaves the device is what is needed to verify your subscription with the App Store. The full architecture is on our security page.
Privacy does not mean weaker tax records
Some drivers worry that a private, on-device log will not satisfy the IRS. It can. What the IRS cares about is a contemporaneous record: the date, miles and business purpose of your driving, recorded as you drove. Where that record is stored does not change its value. A dated on-device log, exported to your accountant at tax time, is as good as any cloud log. For what the log needs to capture, see our guides to deadhead miles and Schedule C.
What to check before you install a tracker
You do not have to take any app's word for it, including ours. Before you trust a tracker with your routes, check:
- The App Store privacy label. Apple requires apps to declare what data they collect, whether it is linked to you, and whether it is used to track you across other companies' apps and websites. Read it before downloading.
- The privacy policy's sharing section. Look for whether data is sold, shared or disclosed to third parties, and for the words "advertising" and "partners."
- Whether an account is required. An app that makes you create a login is building a record tied to your identity. That is not automatically bad, but it is worth noticing.
- Your phone's own reports. On iPhone, Settings › Privacy & Security shows which apps use your location and when, and the App Privacy Report shows which domains each app contacts.
Frequently asked questions
Do mileage tracking apps sell your data?
Some do share or monetize it, usually through analytics or advertising SDKs, cloud storage of your routes, or insurance referrals, and it is typically disclosed in the privacy policy. Check the App Store privacy label and the sharing section of the privacy policy before you install.
What is an on-device mileage tracker?
An on-device tracker reads your phone's GPS, calculates your trips and stores them only on your phone. The company never receives your routes, so there is no central database of your driving to sell, share or breach.
What happens to on-device mileage data if I lose my phone?
The app maker has no copy to restore. Your own device backup, such as iCloud or an encrypted computer backup, may bring it back, and exporting your log regularly protects your tax records either way. The IRS generally expects you to keep records for at least three years after filing.
Has anyone been penalized for selling driving data?
Yes. In January 2026 the FTC finalized an order barring General Motors and OnStar from sharing drivers' geolocation and driving behavior data with consumer reporting agencies for five years. In January 2025 the Texas attorney general sued Allstate and its subsidiary Arity over driving data allegedly collected through software built into other apps.
The bottom line
A mileage tracker needs your location. It does not need to keep it forever, upload it or sell it. Those are separate choices, and they separate a tool you can trust from a data business dressed up as a tracker. When your daily routes are also your livelihood, that difference is worth caring about.