Privacy policy
Last updated 8 November 2026
Lunge is a home workout app for iPhone, made and operated by Aras Can Akin, an individual developer. The short version: Lunge has no account and no ads, and never asks who you are. It counts how the app and this website are used, under a random device ID not linked to you, and when the app crashes it sends an anonymous crash report so the crash can be fixed.
What stays on your iPhone
- Your workouts and moves — the ones you build or add, stored on your iPhone only.
- Your settings — the app's language and whether to track workouts in Apple Health.
None of it leaves the device, beyond the usage events below. Deleting the app deletes all of it, except the random ID below, which stays on this iPhone so a reinstall isn't counted as a new person.
How the app is used
Lunge sends events such as a workout started or finished, a step skipped, a workout or move added, the Pro screen opened and a purchase made, to our own analytics system. They name the built-in workout or move, how long a workout lasted, and the plan bought and its price; never what you named your own workouts and moves, and no Health data. They carry a random ID kept on this iPhone, the app version, the iPhone model, the iOS version, the language setting, and whether the app came from the App Store or TestFlight. They are not linked to you, are not used for tracking or advertising, and are kept for up to a year.
Crash reports
When Lunge crashes, the next time it opens it sends a report of the crash to Sentry (Functional Software, Inc.), which stores it in the EU. A report holds what is needed to find the fault: where in the code the crash happened, the app version, the iPhone model, the iOS version and the language setting.
It holds no name, account, device identifier or IP address, and none of your workouts, moves or Health data. Reports are not linked to you, not used for tracking or advertising, and are kept only as long as they are useful for fixing crashes.
Visits to this website
This website counts each page you open, the site that linked you to it and any campaign named in the link, and a tap on the App Store link, in our own analytics system. A visit is told apart from another only by a random ID that lasts while the page is open: no cookie or anything else is stored on your device, and visits are not linked to you.
Apple Health
Lunge reads from and writes to Apple Health only with your permission, which you can change at any time in the Settings app.
- During a workout it reads your heart rate and active calories, when a heart-rate sensor your iPhone reads is connected.
- To work out your heart zone and total calories it reads your resting heart rate, age, sex, height, weight and resting energy.
- At the end of a workout it saves the session to Apple Health as a workout, only if you choose to.
Health data is used on your iPhone for these calculations and nothing else. It is never sent to us or to anyone, never used for advertising, and never sold.
Who else is involved
Sentry, for crash reports only, as described above. Lunge contains no third-party analytics, advertising or tracking code; the app's usage and this website's visits are counted in our own analytics system, on servers Railway hosts in the EU. Apple processes App Store purchases and the crash reports you choose to share with developers, under Apple's own privacy policy.
Children
Lunge is not directed at children under 13, and never asks anyone who they are.
Changes and contact
If what Lunge collects ever changes, this page will change first, with a new date above. Questions: support@bluetrail.app.