Privacy Policy

The Short Version ☕

We don't collect your personal data. We don't have accounts, logins, or backend servers. Everything runs in your browser.

No Backend Services

cffy.in is a collection of purely client-side web applications. All processing happens entirely within your web browser. We do not operate any backend servers, databases, or APIs that receive, store, or process your personal information.

Any data you enter into our apps (e.g. vocabulary progress in German Trainer, game scores in Bridge Builder Math) is stored only in your browser's local storage on your own device. We never have access to this data. Clearing your browser data will remove it.

No Accounts or Personal Information

We do not require or offer user accounts, sign-ups, email collection, or any form of registration. We do not collect names, email addresses, or any other personally identifiable information.

Google Analytics

We use Google Analytics (measurement ID: G-GJZMWKQY28) to understand how visitors use the site — specifically, which pages are visited and general traffic patterns. Google Analytics may collect:

• Pages viewed and time spent on pages
• Approximate geographic location (country/city level, based on IP address)
• Browser type, device type, and operating system
• Referring website or source

This data is aggregated and anonymous — we cannot and do not identify individual users. Google Analytics uses cookies to distinguish unique visitors. You can opt out of Google Analytics tracking by installing the Google Analytics Opt-out Browser Add-on, or by disabling cookies in your browser settings.

For more information on how Google processes this data, see Google's Privacy Policy.

Cookies

cffy.in itself does not set any cookies. However, Google Analytics sets cookies (such as _ga and _ga_*) to measure site usage. These are the only cookies used on this site.

Third-Party Services

Besides Google Analytics, some apps may load resources from third-party CDNs (such as Tailwind CSS, fonts, or JavaScript libraries). These services may log standard web request data (IP address, user agent) according to their own privacy policies. We do not control or have access to any data collected by these third parties.

Children's Privacy

Our educational apps are designed to be safe for users of all ages. Since we do not collect any personal data, there is no special risk to children. No personal information is requested, collected, or shared.

Changes to This Policy

If we make changes to this privacy policy, we will update the "Last updated" date at the top of this page. Given the minimal data practices of this site, significant changes are unlikely.

Contact

If you have questions about this privacy policy, you can reach us by opening an issue on our project's repository or contacting the site owner directly.