One Calculator Privacy Policy
This policy describes how One Calculator ("we") handles information when you use the One Calculator mobile app, the website, or the WeChat mini program. It applies only to this app. Last updated September 6, 2026.
What this app does on your device
One Calculator is an on-device calculator. Basic and scientific calculations, history, unit conversion, tip splitting, and your settings stay on this device. We do not operate an account system and we do not upload your expressions, history, or settings to our servers.
Information the app uses
- Calculation history and settings — stored locally so you can reopen recent results and keep decimal, theme, language, sound, and haptic preferences.
- Currency rates — if you open the currency converter, the app fetches a public exchange-rate table. The request does not include your calculations, history, or a user identifier.
- Optional system sheets — if you choose to share a result or rate the app, Apple, Google, or WeChat handle that action on the device.
What we do not collect
This version does not create an account, does not require a purchase, and does not send analytics, advertising identifiers, crash reports, or your calculation history to a backend.
We do not sell, rent, or trade personal information.
Sharing
The app may open your mail app when you send feedback, so the message goes directly from your device to [email protected]. Store review prompts, if you choose to rate the app, are handled by Apple or Google.
Children
One Calculator is not directed at children under 13. We do not knowingly collect personal information from children.
Changes
We may update this policy. The latest version will be posted at this URL and in Settings. Continued use after a change means you accept the updated policy.
Contact
Questions about this policy: [email protected]