Russio

Privacy Policy

Last updated: June 24, 2026

In brief: Russio works fully offline and keeps all of your learning data on your device. If background sync is available, an anonymous account (a random identifier, with no name, email, or contact information) is used to back up your learning progress to Firebase infrastructure operated by Google LLC. Russio contains no advertising, no analytics, no crash-reporting SDKs, and no tracking. We do not sell your data, and we never ask for personal information. Optional Russio Pro purchases are processed entirely by the Apple App Store or Google Play, so we never see or store your payment details.

1. General Information

Russio ("the App") is a mobile application that teaches English speakers the Russian alphabet and language, developed and published by IOCODO LLC ("we", "our", "us").

This Privacy Policy explains what information the App handles, how it is used, and the choices available to you. Russio is designed to be privacy-first: it is fully usable offline, and it never requires you to provide a name, email address, or any other personal detail.

2. Data Stored on Your Device

The App stores your learning data locally on your device. This is the primary copy of your data and is what makes the App work offline. It includes:

Your learning progress and spaced-repetition review schedule (which letters and words you have studied and when they are due for review)
In-app preferences and settings (sound, haptics, music, source language, reminder time)
Locally scheduled practice reminders, if you choose to enable notifications (these are scheduled on your device by the operating system and are not sent from any server)

This on-device data is removed when you uninstall the App, subject to any device backup behavior controlled by Apple or Google.

3. Account and Authentication

Russio does not require you to create an account or sign in to learn. To back up and synchronize your learning progress, the App may sign you in anonymously using Firebase Authentication (Google LLC).

An anonymous sign-in generates a random identifier tied to your installation. No email address, name, password, phone number, or social login is collected. We have no way to identify you personally from this identifier.

4. Data Stored in Firebase Backend Services

When background sync is active, Russio uses a small set of Firebase services operated by Google LLC:

Firebase Authentication — issues the anonymous identifier described above.
Cloud Firestore — stores a backup of your learning progress (review states), keyed to your anonymous identifier, so it can be restored on the same device. No personal data is stored.
Firebase App Check — verifies that requests come from a genuine Russio installation, using device attestation (App Attest on iOS, Play Integrity on Android). It does not collect personal information on our behalf.

Russio does not use Firebase Analytics, Firebase Crashlytics, Realtime Database, Cloud Messaging, or any advertising service. Data stored in Firebase is subject to Google LLC's data processing terms and privacy policies.

5. Content Reports

If you tap "Something looks wrong?" to report a translation, pronunciation, or other content error, the App sends us a small report so we can fix it. A report contains only: the item being reported, the type of problem, a snapshot of the on-screen text, the App version, and your anonymous identifier. It contains no personal information and is used solely to improve the App's content. Reporting is always optional.

6. Advertising, Analytics and Tracking

Russio displays no advertisements, uses no analytics SDK, uses no crash-reporting SDK, and performs no tracking of your activity across apps or websites. There is no advertising identifier collection of any kind.

7. Network Requests and Third-Party Services

During normal operation, the App communicates only with the following third-party services:

Firebase Authentication (Google LLC) — anonymous identifier
Cloud Firestore (Google LLC) — learning-progress backup and content reports
Firebase App Check (Google LLC) — request integrity verification
Google Fonts (Google LLC) — font assets for this web page only

Important: Each third-party service listed above processes data under its own privacy policy. Please review those policies directly for provider-specific details on data handling and retention.

8. Payments and Subscriptions

Russio is free to start. An optional Russio Pro upgrade (a monthly or annual auto-renewing subscription, or a one-time lifetime purchase) unlocks the higher levels. All payments are processed entirely by the Apple App Store or Google Play. We do not operate our own payment system.

We never receive, see, or store your credit-card number, billing address, or any other payment details. The store reports back to the App only whether a valid Russio Pro entitlement exists, so the App can unlock paid content. That entitlement check contains no personal or financial information. Your purchases, billing, and refunds are governed by the privacy policy and terms of the store you bought from. See our Terms of Use for the subscription terms.

9. Data Sharing and Sale

We do not sell your data. We do not share your data with any third party except as required to operate the App — specifically, by transmitting your anonymous learning backup to Firebase services as described above — or as required by law. No data is shared with other users.

10. Account Deletion and Data Retention

You can delete your anonymous account and all associated data at any time:

In-app: open Settings, scroll to the bottom, and tap Delete account, then confirm. This removes your learning-progress backup from Cloud Firestore, deletes your anonymous Firebase Authentication account, and clears all learning data stored on your device.
By email: send a request to support@iocodo.com with the subject "Russio Account Deletion". We will complete the deletion within 30 days and confirm by reply.

After deletion, your data is removed from our active systems within 30 days.

11. Children's Privacy

Russio is a general-audience education app. It is not directed at children under the age of 13, and we do not knowingly collect personal information from children. Because the App collects no personal information from anyone, it is suitable for learners of all ages under the supervision appropriate to their context.

12. Your Choices

You can use the App fully offline; learning works without any network connection.
Content reporting and practice reminders are optional and off by default until you enable them.
You can delete your account and data at any time, as described in Section 10.
You can remove all locally stored data by uninstalling the App.

13. Changes to This Policy

We may update this Privacy Policy from time to time. If we make material changes, we will update the "Last updated" date at the top of this page. Continued use of the App after changes are posted constitutes your acceptance of the updated policy.

14. Contact

If you have questions about this Privacy Policy, please contact:

IOCODO LLC
Email: support@iocodo.com
Website: iocodo.com