Privacy
Last updated: October 6, 2026
The short version
Dyestack does not collect, store, or share any information about you. Your photos and videos are developed on your own device and never leave it. The optional Sky forecast (below) is the only feature that uses the internet.
What the app does with your files
When you open a photo or video, Dyestack reads it on your device, develops it, and saves the result to your photo library or to the folder you choose. Nothing is uploaded. There is no account, no sign-in, and no server on our side.
Permissions
- Internet (Sky forecast only). Used solely to download a small public weather-forecast file for your region when you open the optional Sky screen or have forecast alerts on. Editing, exporting and every other feature work with no connection.
- Approximate location (Sky forecast only, optional). If you allow it, the phone reads its last approximate location once to find your region. Only a rounded place (about 10 km) is kept, on the device. It is never sent to us or anyone else: the app asks our server for a regional file by its tile name, and the score is worked out on your phone. You can type a place instead.
- Notifications. Used only to show progress and completion of an export you started.
- Background processing. Used only so a long export or video keeps running if you switch apps.
- Photos. On iPhone, the app asks to add pictures to your library when you save one. It reads only the pictures you pick.
Sky forecast, in detail
Forecast files are built from public-domain NOAA weather-model data and hosted on Cloudflare. A request for a file reveals your network address to the host and which 5 by 5 degree region (a tile, roughly 500 km square) you asked for, as any web request does; we do not keep a log tied to you and have no accounts to link it to. Alerts are scheduled on your phone.
Saved looks and settings
Your saved looks and preferences are stored on your device only, and are removed when you uninstall the app.
Analytics, ads, and third parties
Dyestack contains no analytics, no advertising, and no third-party tracking.
Children
Dyestack collects no personal information from anyone, including children.
Changes
If this ever changes, we will update this page and the date above before the change takes effect.