FeiRate Privacy Policy

Updated: October 14, 2026
Developer: Feirong Gao (高飞荣 / 子义飞云)
Contact: zyfly_app@qq.com

FeiRate is an offline mathematical interest and repayment calculator. It requires no account, connects to no developer server, and includes no advertising, analytics or tracking SDKs. The developer does not collect, receive or sell your calculation inputs, usage history or local scenarios through the app.

On-device processing and storage

The principal, annual rate, duration and calculation method are processed on your device. Named scenarios you choose to save, including the name, calculation parameters and save date, remain in the app’s local storage for you to reopen. Preferences such as language are also stored locally. There is no app-level cloud synchronization.

You can delete saved scenarios from the scenario list. Deleting the app removes its local data; offloading the app may retain it. System backups may contain app data, depending on your device and Apple backup settings. We cannot access or delete those backups for you.

Exports you choose

Only when you choose to share or export does the app hand the selected calculation content to system sharing or file export. Your chosen receiving app, file destination or service handles it under its own policies; some destinations may use the network. The developer does not receive a copy. Deleting an in-app scenario does not delete exported files. Delete those files at their destination.

Permissions and external services

Calculations do not require contacts, location, photos, microphone or camera access. The app does not offer loan applications, bank connections, payments or credit assessments. In-app methods, support and privacy information can be read offline. App Store downloads, system backups and user-selected share destinations are handled by their respective platforms.

Support correspondence

If you voluntarily email the address above, we receive your email address and the information you include, solely to handle that support request and necessary follow-up. Do not send identity documents, bank account details or unnecessary sensitive information. You can request deletion of support emails at the same address; we will honor the request except where retention is legally required. Email providers handle messages under their own policies.

Children and changes

The app itself does not collect personal data from any users, including children. If its features or data practices change, we will update this policy and its date.