Open Model Lab saves learning progress in this browser by default so the core product works signed out.

That local progress can include concept history, continue-learning state, review cues, and other study state tied to this browser. Clearing site data or switching browsers can remove or separate that local state.

If you sign in, the app stores the account information needed to authenticate the session and resolve free versus premium access.

Core learning progress sync uses the existing account backend for any signed-in account, while premium-gated features such as saved setups, saved compare setups, exact-state sharing, and advanced study tools stay bounded to the premium layer where those features are actually implemented.

If you use the feedback form, the app can send your message, page context, and any reply contact you include to the configured support inbox through the existing server-side delivery path.

If direct delivery is unavailable, the site keeps the mailto fallback visible instead. Do not send sensitive information you would not want copied into a support thread.

Premium checkout and subscription management are handled through Stripe-hosted pages rather than custom card forms inside the app.

The product stores only the billing facts needed to connect a Stripe customer or subscription to your account and update the app's premium entitlement state.

This deployment may enable lightweight analytics for page and learning-signal events. Analytics is optional and separate from advertising.

When ads are enabled, the product uses manually placed Google AdSense units on selected discovery pages only, not on the main concept lab or challenge surfaces.

You can use the core learning product signed out, sign in only when you want account features, or contact support with questions about privacy, billing, or saved data.

For billing-specific questions, use the public billing path below or email support directly.