Your data stays on your device.

All file processing and calculations run in your browser. No accounts, file uploads, advertising or analytics scripts are enabled.

Favorites, recent tools, themes and explicitly saved scenarios are stored locally. The PWA caches application assets only. Clear site data to remove records. Photos are never saved automatically.

Photo checks cover measurable properties, not approval by an authority. Finance estimates use the stated assumptions and do not replace bank statements or official tax filing. English salary tools still use mainland China rules.

If something fails, reset the form or reload. File sizes and memory are limited by your device. When investigating an issue, record the tool, steps, browser version and error message, without including personal information.