How much battery does it use?
Miles is built to sip. It does not keep high accuracy GPS running all day: it asks for more accuracy when you are moving and goes near-dormant when you are not. I have not measured the cost across devices and travel patterns, so I am not going to put a number on it. Check it yourself in Settings, Battery after a week. Apple requires apps like this to warn that continued background GPS use can dramatically decrease battery life; that warning is exactly why Miles uses GPS sparingly rather than continuously. If it is materially worse for you, tell me, because that is a bug report and not a complaint.
What happens when it misses a trip, or gets the mode wrong?
Both happen. Detection is very good, not psychic, and iOS can suspend any app at any time. When a mode is wrong, open the trip and pick the right one: two taps, and it sticks. When a journey is missing entirely, add it manually. Trips Miles is unsure about wait in a short review queue rather than quietly guessing.
If I lose my phone, do I lose my log?
Back Up Everything, in the app's settings under Data, writes a single file holding your whole history: every trip with its route, your saved places, your Private Areas, your achievements. Keep it wherever you keep things. Restore from Backup on the new phone reads it back. Both are free on every tier, because being locked out of your own movement history is the thing we most dislike about this category.
Restoring merges rather than overwrites. Each trip is recognised individually, so restoring onto a phone that already has history adds only what is missing, and importing the same file twice changes nothing the second time.
Your normal iPhone backup should carry Miles to a new phone as well: the database lives in a folder iOS backs up. We say should because we have not run that end to end across two devices yet, so take a backup file too when you change phones. Photos are linked to your photo library rather than copied, so those links may not resolve on a new phone even though the trips do.
There is still no iCloud sync in version 1.0, and it stays top of the list for what comes after. CSV export stays free, but it is for spreadsheets rather than restoring: no routes, no journeys, no photo links, and endpoints inside a Private Area are blanked.
You say private, but you ship Google Firebase. Which is it?
Both are true and neither is hidden. Your trip history stays on your device: there is no account, no login and no Miles server to send it to. Separately, Miles uses Firebase Analytics and Crashlytics for anonymous usage statistics and crash reports, and it sends coordinate lookups to open mapping, weather and transport services to name places, check the weather and identify stations and flights, and for elevation a small sample of route points in one request. The analytics never include coordinates, place names, routes or Health data. The full list is above, and it is deliberately above the pricing rather than below it.
Does it track my flight live?
No. Miles is not running while you are in the air, by design: it is a low power background tracker, and a low power tracker with no signal, no movement it can see and nothing on screen gets suspended by iOS. Miles notices the airport, expects that silence, and rebuilds the flight when you land.
An app you are holding, with the screen on, can still get a GPS fix by a window. What a low power background tracker cannot do is quietly follow you for eleven hours with the phone locked in your pocket, which is the thing Miles is actually trying to be the other 364 days a year.
I came from Google Maps Timeline. What should I know?
Two practical things. Miles cannot import your Timeline history, so your Miles log starts on the day you install it. And Miles has no server, so nothing about your log depends on a company's retention policy.
For context on why people arrive here: Google moved Timeline to on-device storage, only a recent window of history came across for many people, the web view was removed entirely, and Google confirmed in March 2025 that a technical issue had deleted some people's Timeline data.
Do I need an account?
No. There is no sign up, no login, no email address and no password. You install it, grant location and motion access, and that is the whole setup.
Can I get my data out?
Yes, as CSV, free, with no subscription. It is in the app's settings. Data portability is not a paid feature.
Is this a mileage tracker for tax?
No. Miles has no tax rate tables, no business and personal classification workflow and no reimbursement reports. If you need mileage for a tax return, one of the dedicated apps will serve you better. Miles is a log of everywhere you went, for you.
Does it work on iPad? Is there an Apple Watch app?
Miles runs on iPad. There is no Apple Watch app at launch.
Which permissions does it need, and why?
Location set to Always, so trips can be detected while your phone is in your pocket. With "While Using" instead, Miles can only record while the app is open on screen. Motion and Fitness, which is how it tells a walk from a bus ride. Both are asked for during setup, both are explained before the system prompt appears, and both can be declined, in which case Miles still works for manual trips.