Privacy Policy

This policy explains how the iOS app PuffSum (算团子, the “app”) handles information. The developer can be reached at the address below. Using the app means you understand this policy.

Everyday calculations do not need an account in the app.

Records stored on the device

Calculations, history, sheets, workspace projects, and the style and currency you choose are written to the device first. Before you delete the app, keep anything you still need or make your own backup. We cannot restore a record that existed only on the device and was never backed up.

What leaves the device only when you choose it

These features run when you use them. If you do not, the app does not read the related information for that reason.

• iCloud backup: Available in Settings and off by default. When you turn it on, the backup is stored in your own iCloud account for backup and restore. It is not live sync across devices, and the device needs to be signed in to iCloud. The backup does not pass through the developer’s servers.
• System share sheet: When you share an expression, a sheet, or project text, the content goes to the system share sheet and the destination you pick. We do not receive a copy because you shared it.
• Purchases: Apple processes payment. The app uses Apple’s verified purchase status to unlock PuffSum Plus. It does not receive your card details.

What we do not do

This version does not include advertising trackers or third-party analytics, and we do not sell personal information. That is not a promise that nothing ever leaves the device. If you turn on iCloud backup, use the system share sheet, or email support, the related information leaves the device in the ways described above.

A currency choice sets the amount label and decimal precision. It is not a live exchange rate. Projects calculate from the values you enter. The app does not contact a network to fill in fees, tax rates, or exchange rates.

Support email

If you write to jerry2100003@gmail.com, we use the address, the message, and anything you attach only to reply and to match later messages from you. Those emails are kept for no more than twenty-four months, then deleted or anonymized.

PuffSum Plus

Some keyboard styles and saved workspace projects beyond the base limit are optional PuffSum Plus features. Monthly and annual plans are auto-renewable subscriptions. Lifetime is a one-time purchase. Apple’s in-app purchase handles them. Before you buy, the app shows the plan, price, and period, and that display controls.

Children

The app is not directed at children, and we do not knowingly collect personal information from children. If you believe we have received a child’s information by mistake, contact us as described below and we will delete it.

Your choices

You can delete saved data in the app, and you can delete the app. iCloud backup can be turned off in the app, and the app’s iCloud permission can be managed in system settings. Calculations still work without backup; the records then stay on that device. Subscriptions are managed in the App Store subscription settings. Deleting the app does not cancel a subscription.

Changes

We may update this policy. The new version is published on this page, and the date on the page changes. If a change materially affects your rights, we will also say so in the app.

Contact

Privacy questions: jerry2100003@gmail.com.