Privacy Policy

Last updated: July 2026

1. Principles

Otolog (the "App") is designed with the privacy of you and your students first. It has no server and requires no account. All data you enter or save — including student names, grades, lesson days, guardian notes, method-book progress, assigned pieces, lesson notes, and tuition records — is stored only on your device.

2. Data collection

The developer does not collect, obtain, or transmit any personal information about you or your students through the App. Its App Store privacy label is "Data Not Collected".

3. About your students' information

Most students recorded in the App are minors. The App never asks students or guardians to create an account, and never sends their information off your device. You may enter a nickname instead of a real name.

4. Network access

The App does not need a network connection to view or enter records. Communication occurs only when you make an in-app purchase (Otolog Pro) through the App Store, or restore that purchase. This is handled by Apple's StoreKit, and the developer receives no information identifying the purchaser.

5. Encrypted backup

Backup files exported from Settings are encrypted with a password you choose (AES-GCM). Where you store the exported file — on the device, in the Files app, on external storage, or in a cloud service — and how you manage it afterwards is entirely up to you. The developer cannot access the file. If you lose the password, no one — including the developer — can restore it.

6. Face ID / Touch ID

App lock uses Apple's LocalAuthentication. Biometric data is never shared with the App or the developer; only the success or failure of authentication is returned.

7. Third parties & analytics

The App uses no advertising SDKs, analytics SDKs, or tracking, and shares no data with third parties.

8. Your responsibility

Complying with the laws that apply to collecting and handling your students' and their guardians' personal information is your responsibility. The App stores data on your device by design, but this does not remove every risk — including loss or theft of the device and how you handle backup files. This page is general information, not legal advice.

9. Changes

If this policy changes, this page will be updated.

10. Contact

freetokyo2020@yahoo.co.jp (Developer: freetokyo)