Effective October 12, 2026

Privacy Policy

SprintArc has no servers. Your training and health data stay with you and with Apple — none of it ever reaches us.

No accounts · No analytics · No ads · No third-party SDKs

Health data

SprintArc uses HealthKit to do its job. With your permission, it reads only the types it asks for on the Health permission sheets: on your iPhone, heart rate variability, resting heart rate, sleep, wrist temperature, and your workouts; on your Apple Watch, heart rate, active and resting energy, steps, and running metrics. It saves each completed session back to Apple Health as a workout, with its active and resting energy, steps, and running metrics. It never writes heart rate.

SprintArc does all of its processing — your readiness score included — on your iPhone and Apple Watch. It never transmits your health data to us or to anyone else, never uses it for advertising or marketing, and never sells it. You control each permission in the Health app and can revoke access at any time.

Storage

SprintArc keeps your session history in the Notebook, in its own storage on your iPhone, along with a few records of its own: your onboarding progress, a cached copy of your trial and unlock status, the date your Notebook counts from, a marker for a day you chose to train anyway, a notice waiting to be shown, and bookkeeping for a session in progress.

Each session in the Notebook records when it started and when it reached your iPhone, how long it ran, its reps and planned sprint distance, how long each rest lasted, the heart-rate recovery readings taken after its sprints, and whether it was shortened or trained against a rest-day recommendation. It also records the readiness score it began from, when there was one; your readings of heart rate variability, resting heart rate, sleep, and wrist temperature; your baselines for heart rate variability, resting heart rate, and sleep; and how widely each reading had been varying. The readings and baselines are read from Apple Health when the session reaches your iPhone. SprintArc works out your current baseline from your Apple Health data each time it calculates your readiness.

Your Apple Watch keeps each finished session for at least seven days — until the Apple Watch app next runs after that — whether or not it has reached your iPhone, and keeps the state of a session in progress so that a crash cannot lose it. It also keeps its own onboarding progress, a count of your completed sessions, and a cached copy of the unlock status and trial end your iPhone sent it. It keeps the latest readiness your iPhone sent it — your readiness score and its state, which the app and its complication on your watch face both show, and your baseline for resting heart rate — until a newer one from your iPhone replaces it. For the complication, it also keeps whether the app is locked and when a trial ends.

Apple’s software that carries data between your iPhone and Apple Watch keeps copies of its own in SprintArc’s storage. On your iPhone, it keeps the last readiness update sent for the Apple Watch app to collect later, including your readiness score and your baseline for resting heart rate, until a later one sent the same way replaces it. It also keeps any transfer to your Apple Watch not yet delivered, such as the start of a session, which carries its planned reps and distance along with the same readiness details. On your Apple Watch, it keeps the last such update the Apple Watch app received, until the next one replaces it, and any transfer to your iPhone not yet delivered, such as a finished session.

SprintArc uses no iCloud storage of its own; if you sync Apple Health through iCloud, the workouts SprintArc saved there sync with the rest of your Health data.

Deleting SprintArc from your iPhone removes all of this, and removes the Apple Watch app with it. Three things remain: the workouts it saved to Apple Health, which stay under your control in the Health app; your own Health readings, which were never SprintArc’s; and your purchases, which are App Store records tied to your Apple Account and restore when you reinstall. A backup of your iPhone made while SprintArc was installed includes its storage, like any app’s: restoring that backup brings it back, and deleting the app does not remove it from the backup.

Location

SprintArc never requests location access and stores no routes or maps. Distance and pace metrics for outdoor workouts are computed by watchOS as part of the workout and saved only to your Apple Health data.

Purchases

SprintArc’s seven-day trial unlocks everything; when the week is up, the app locks until a one-time unlock is purchased — one purchase, no subscription. The purchase is processed by Apple through the App Store. Your payment details go to Apple, not to us, and we receive no personal information from a purchase.

Crash and usage reports

If you have opted in to “Share With App Developers” on your device, Apple may provide us with aggregated, anonymized crash and usage statistics. That sharing is controlled by you and Apple in Settings → Privacy & Security → Analytics & Improvements.

This website

sprintarc.app is a static page: no cookies, no analytics, no tracking. It is served by Cloudflare, which transiently processes basic request data (such as IP addresses) to deliver and secure the site.

Your rights

Because we process no personal data, there is nothing for us to disclose, export, correct, or delete — your data lives with you and with Apple. If you have questions about your rights under the GDPR or similar laws, contact us and we will help.

SprintArc is not directed at children under 13, and we knowingly hold no personal data about anyone.

Changes

If this policy changes, the updated version appears on this page with a new effective date.

Contact

SprintArc is developed by Ali Almuhanna.
Questions: privacy@sprintarc.app