Privacy

Updated October 15, 2026

Your work stays on your device

Equations are calculated in your browser. Your equation workspace, including constants and settings, is saved in this browser’s IndexedDB so it can be restored after reloading. Use Clear all in Equals to clear that workspace. Turn In processes documents on your device and saves assignments in this browser’s IndexedDB. We do not upload equations, document contents, filenames, assignment names, or exported PDFs to our analytics service.

Notebook calculations

Notebook stores documents, result snapshots, and images in this browser’s IndexedDB. Portable .classkit files contain this work and saved results. Calculations run on your device using RunMat in the browser. Notebook content and calculation values are not sent to a calculation server.

Optional folder sync and backups

If you enable Sync & Backups, ClassKit writes your saved work, original files, and recovery versions to a folder you choose. If that folder is managed by a cloud provider, that provider uploads and downloads the files under your account and sharing settings. ClassKit does not receive those documents on its servers. Anyone with access to the folder can read its contents. Disconnecting or clearing browser data does not delete folder copies. Temporary interface state is excluded.

Optional usage measurement

If you choose to allow analytics, the site sends a page category and a small set of actions, such as solving a system or downloading a PDF, to this site’s own server. We store daily totals by tool and action, plus a broad referral category (direct, search, social, or other). We do not store visitor identifiers, analytics cookies, IP addresses, complete referrer URLs, or browsing histories in the analytics database. These totals measure activity, not unique people.

Analytics are off until you allow them. Your choice is saved on this device. Use “Analytics choices” in the footer to change it. Do Not Track and Global Privacy Control signals disable collection. Previously counted activity remains in aggregate totals; it cannot be linked back to you. Aggregate totals are kept to compare usage over time.

Hosting and local storage

The hosting provider processes network information needed to deliver and protect the website, which can include IP addresses and technical logs. The app caches its assets for offline use and stores your analytics preference locally. Clearing site data removes saved equation workspaces, local assignments and notebooks, preferences, and offline files. Download backups before doing so.

Advertising

No advertising scripts are enabled. If advertising is introduced, this notice and the relevant consent controls will be updated before ads are enabled.

Owner reports

Owner reports are not exposed on this website. Visitors do not need to sign in to use the tools.