Last updated: September 2026
Stemulus processes submitted problem images and text, account identifiers, profile information returned by your sign-in provider, purchase transactions, and usage records. Solutions are saved locally on your device. The service also stores solution text and usage records in Cloudflare storage; successful arithmetic-checked solutions may be cached for up to 30 days.
Our daily cleanup removes server solution and study-result content, cached database copies, and diagnostic solution records older than 30 days. Cleanup may take up to one additional day. Minimal request and purchase records remain for duplicate-charge prevention and account access. Saved solutions on your device remain until you remove them. Provider processing and retention are governed by the providers’ service settings and policies.
We do not track you across apps or sell your data. We use Cloudflare infrastructure and AI model providers to process submitted problems. The app does not include third-party advertising SDKs.
Camera and screen-capture access lets you select a problem. After you choose Check Problem, the selected image and problem text are sent over HTTPS to our service and its AI providers for processing. Capturing an image alone does not submit it.