Terms of Use

These terms are an agreement between you and the developer of PuffSum (算团子) for the iOS app. By downloading, installing, or using the app, you agree to them.

License

We grant you a personal, non-transferable, non-exclusive license to use the app on Apple devices you own or control. The license does not include selling, renting, reverse engineering, or modifying the app beyond what applicable law allows.

Your content

Expressions, history, sheets, projects, and notes you create in the app belong to you. We claim no rights in that content beyond what is required to run the app on your device, to complete an iCloud backup you turn on, and to complete a share you start.

PuffSum Plus

Some keyboard styles, and saved workspace projects beyond the base limit, need optional PuffSum Plus. Monthly and annual plans are auto-renewable subscriptions. Lifetime is a one-time purchase. Price, period, included features, and renewal terms are shown in the app and on Apple’s purchase sheet before you buy, and those displays control.

Apple processes payment. Manage or cancel a subscription in your Apple Account subscription settings. Deleting the app does not cancel it. A lifetime purchase is not a subscription and does not renew on a schedule.

Apple’s standard end user license: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Acceptable use

You agree not to use the app in violation of law, not to infringe anyone else’s rights with it, and not to interfere with the app.

PuffSum is a personal calculator and notebook. Project results use the values you enter. Fees, tax rates, and exchange rates are not fetched. A monthly plan, including a loan schedule, is a fixed-rate estimate. It is not a quote from a bank, lender, or tax authority, and it is not financial, tax, or legal advice. A currency choice is a label and a precision setting, not a live exchange rate.

Intellectual property

The interface, name, marks, key artwork, and built-in writing (other than content you create) belong to the developer or the respective rightsholders. Do not use them to imply an official partnership or to confuse the source of the app.

Disclaimers and limits

To the fullest extent applicable law allows, we are not liable for indirect, incidental, or consequential loss from using or being unable to use the app, including lost records or decisions you make from a project estimate, unless the loss is caused by our intent or gross negligence, or the law does not allow the exclusion. The app depends on your device, the system, iCloud, and Apple’s purchase services. We do not guarantee uninterrupted or error-free operation.

Ending the license

You may stop using the app and delete it at any time. If you seriously breach these terms, we may stop providing updates or support. When the license ends, you should stop using the app. Subscriptions and lifetime purchases already made through Apple follow Apple’s rules.

Governing law

These terms are governed by the laws of the People’s Republic of China, excluding conflict-of-law rules. The parties will first try to resolve a dispute through friendly discussion. If that fails, either party may bring the dispute before a people’s court with jurisdiction where the developer is located.

Changes

We may update these terms. The updated version is published on this page, and the date changes. If you keep using the app after the update takes effect, you accept the updated terms.

Contact

Questions about these terms: jerry2100003@gmail.com.