Privacy Policy
Effective date: 2026-05-21
0to42K is built so that your data stays on your device. This policy explains what the app does and does not do with your information.
Summary
- 0to42K does not collect, transmit, sell, share, or sync any personal data.
- 0to42K does not use analytics, advertising, or tracking SDKs of any kind.
- 0to42K does not contact any server we operate. There is no backend.
- All of your runs, routes, plans, races, and settings live only on your iPhone and Apple Watch.
What 0to42K stores on your device
The app stores the following on your device so it can function:
- Runs and routes: start/end time, distance, duration, pace, heart rate, calories, GPS route points, elevation, splits, effort rating, notes, and an optional photo per run.
- Training plans and progress: which plan you chose and which workouts you’ve completed.
- Races and courses: races you’ve added and any GPX courses you’ve imported.
- Shoes: shoes you’ve added and the mileage tracked against them.
- Settings and preferences: distance unit, weekly goal, heart-rate zones, audio cue preferences, and other in-app choices.
- Achievements and personal records: computed locally from your run history.
This data is stored in the app’s local database and in an App Group container shared between the iPhone app, the watch app, and the home-screen widgets. None of it leaves your device through the app.
System permissions 0to42K requests
The app asks for the following Apple system permissions only when needed:
- HealthKit — to save each run as a workout (with route, distance, calories, and effort) and to read heart rate, resting heart rate, sleep, and estimated effort to power training insights. HealthKit data is governed by Apple’s HealthKit framework and stays in the Apple Health app under your control.
- Location — to track your run’s GPS route, pace, and distance, including when the screen is off during a run. Location data is used only for the active run and is stored as part of that run on your device.
- Motion & Fitness — to count steps and measure cadence during a run.
- Apple Music / Media Library — to show what’s currently playing and let you control playback during a run. No music data is stored.
- Notifications — to deliver workout reminders, streak-risk alerts, and run-complete notifications.
You can revoke any of these permissions at any time in iOS Settings → Privacy & Security. The app will continue to work; features that depend on the revoked permission will be disabled.
Apple’s role
Backups of your iPhone (including the app’s data) may be created by Apple via iCloud Backup or encrypted local backups if you have those enabled in iOS. Those backups are governed by Apple’s privacy policy, not by 0to42K.
The Apple Watch companion communicates with the iPhone via Apple’s WatchConnectivity framework. This communication is on-device, peer-to-peer between your own devices.
Children
0to42K is not directed at children under 13 and does not knowingly collect any data from anyone.
Deleting your data
To delete all data the app stores, delete 0to42K from your iPhone. To delete workouts the app saved into Apple Health, open the Health app and remove them there.
Changes to this policy
If we change this policy, we’ll update the effective date at the top and post the new version at the same URL.
Questions about this policy: valentina.farcasanu@icloud.com