FeatherlyBack to FeatherlyWho we are
Featherly is a mobile weight-tracking app published by Julien Graffe (sole trader, France), contact: contact@raphew.dev. This policy explains what data the app processes and why.
No account, data stays on your phone
Featherly has no account and no cloud sync. Your weigh-ins, notes, goal, height, reminders and preferences are stored only on your device. We have no server that receives them and we cannot see them. Uninstalling the app deletes them.
Home-screen widgets show your latest data from the same on-device storage.
Health data (Apple Health / Health Connect)
Only if you allow it, Featherly:
- reads your body weight entries (including past history) from Apple Health (iOS) or Health Connect (Android) to show your full trend;
- writes the weigh-ins you log in Featherly back to Apple Health / Health Connect, so they are kept by your phone's health app (this is how you keep your history across devices).
Featherly accesses weight only: no other health data type.
Health data is processed only on your device. It is never sent to our servers or to analytics, never sold, never shared with third parties, and never used for advertising or marketing.
You can revoke access at any time in Apple Health (Settings → Health → Data Access) or Health Connect (Settings → Apps → Health Connect → App permissions); data already written to your health app stays there until you delete it there.
Android: Featherly's use of information received from Health Connect adheres to the Health Connect Permissions policy, including the Limited Use requirements.
iOS: Data from HealthKit is not used for advertising, is not disclosed to third parties, and is not stored in iCloud by Featherly.
Purchases
Subscriptions (Featherly Plus) are processed by Apple App Store / Google Play and managed through RevenueCat (our subscription infrastructure). RevenueCat receives a random app user ID generated on your device, your purchase receipts and subscription status, and the pseudonymous analytics ID described below (so we can tell which version of a screen led to a subscription). We never see your payment details.
If you start a free trial, the app schedules a local reminder notification before the trial ends.
Analytics and crash reports
To understand how the app is used and to fix problems, we collect pseudonymous usage events (screens viewed, features used, steps of the welcome flow, subscription screens viewed and purchases, app version, device model, OS version, approximate country) linked to the random app user ID above, with:
- PostHog (product analytics, EU servers, IP address not stored);
- Google Firebase Analytics and Crashlytics (crash reports).
Your weight values, notes and any health data are never sent to analytics.
We also use these tools to show different versions of some screens (A/B tests).
Featherly does not collect your device's advertising ID.
Legal basis: legitimate interest in improving the app. You can object at any time by emailing contact@raphew.dev.
No ad tracking
Featherly shows no ads and does not track you across other companies' apps or websites. If we ever add advertising measurement, we will update this policy first and, on iOS, ask for your permission through Apple's tracking prompt.
Notifications
Reminders and nudges are scheduled locally on your device; no push server is used. You can turn them off in the app or in your phone's settings.
Store reviews
If you choose to rate the app, the rating is handled entirely by Apple/Google; we only remember on your device that the rating prompt was shown.
Sharing
When you share a progress image, it is created on your device and sent only where you choose, through your phone's share sheet.
Data retention
- On-device data: until you delete it or uninstall the app.
- Analytics events (PostHog): 12 months.
- Firebase analytics events and crash reports: for the retention period configured in Firebase.
- Purchase records: as required by Apple/Google and by law.
Your rights (GDPR)
You have the right to access, rectify, erase and port your data, and to object to its processing.
Your weigh-ins are already in your hands: they live on your phone and, if you enabled it, in Apple Health / Health Connect, which can export them.
For analytics data, email contact@raphew.dev; because it is pseudonymous and not linked to your name or email, we may ask you for details that let us find it.
You may lodge a complaint with the CNIL (www.cnil.fr).
Changes
We will update this page and the date above.
Third-party processors
| Processor | Purpose | Data | Location |
|---|---|---|---|
| Apple App Store / Google Play | Distribution, payments | Purchase data | Their own policies |
| RevenueCat | Subscription management | Random app user ID, receipts, subscription status | US (Standard Contractual Clauses) |
| PostHog | Product analytics, A/B tests | Pseudonymous usage events | EU |
| Google Firebase (Analytics, Crashlytics) | Usage statistics, crash reports | Pseudonymous events, device info, crash logs (no advertising ID) | EU/US (Standard Contractual Clauses) |
Apple Health / Health Connect are not processors: the data stays on your device, between Featherly and your health app.