Privacy
Short version: everything that matters computes on your device. We never see your inputs or results.
All calculators, simulators, and games run entirely in your browser. The formulas, state, and outputs never leave your computer. There are no API calls that send the numbers you enter.
- Recent tools and favorites (localStorage, only on this browser)
- Game scores and streaks (localStorage)
- Nothing on any server. We do not have user accounts or profiles.
- No login, no email, no personal data collection
- No cross-site tracking or fingerprinting for ads
- No server-side logging of calculator inputs or results
- No selling or sharing of any user data (there is none to sell)
We use Google AdSense to show ads on many pages. AdSense may use cookies and standard advertising identifiers subject to Google's policies. You can manage ad personalization in your Google account or via your browser settings. The tools themselves do not require or use any ad-related data.
Some pages include links to products (e.g., building materials). These are clearly marked and use standard affiliate parameters. Clicking is optional and has no effect on the calculators.
Questions or takedown requests: use the bug report button on any page or the feedback path you prefer. We keep this site minimal on purpose.