Privacy Policy
StopStack is designed as a local-first utility for neutral density filter planning. The app does not require an account.
Data stored on device
Saved filters, recent calculations, and language preference are stored locally on your device.
Sponsored offers
StopStack includes an optional sponsored-offer button powered by Google Mobile Ads. Ads are shown only after you tap the sponsored-offer button.
Google Mobile Ads may process device identifiers, approximate location, interaction data, advertising data, and diagnostics to deliver, measure, and improve ads, subject to Google's policies and your consent choices where required.
Network and tracking
StopStack does not use cloud sync or require a StopStack account. Advertising consent and tracking prompts are handled by Google Mobile Ads and Apple's App Tracking Transparency where applicable.
Website cookies
The StopStack website is a static marketing, support, privacy, and terms site. It does not set tracking cookies, use analytics cookies, or show a website cookie banner. Google UMP privacy choices are an in-app ad privacy control, not a cookie banner for this website.
Contact
For privacy questions, email support through the support page.