Privacy Policy (Dimodoro)

Last updated: 2026-04-06

This Privacy Policy ("Policy") explains how information is handled when you use Dimodoro (the "App" or the "Service"). Dimodoro is provided by Ikuya Fujisaki (藤崎郁也) (the "Operator").

1. Operator

Operator name: Ikuya Fujisaki (藤崎郁也)
Service name: Dimodoro
Public display name: Dimodoro (operated by Ikuya Fujisaki / 藤崎郁也)
Contact: [email protected] (or the in-app support form)

2. Information We Collect / Process

2.1 Information stored on your device

The App stores user settings locally on your device (e.g., dimming level, color, presets, safety settings).

2.2 Account and authentication (Firebase Authentication)

To provide Plus features and cloud backup/restore, the App uses Firebase Authentication and may process:

Firebase Auth UID (including anonymous and Google-linked identifiers)
When you link a Google account: limited account information (e.g., email address, display name)

Core dimming features may be available without linking an account (see in-app UI for current behavior). We do not store email addresses or display names in Firestore; they are handled only for authentication in Firebase Authentication.

2.3 Cloud backup / restore and other cloud data (Cloud Firestore)

If you are signed in, the App may use Cloud Firestore for cloud backup/restore and related cloud records. Settings are not synchronized in real time. Instead, the App stores manual backups and periodic automatic backups, and restores data only when needed. Your devices do not automatically become the same state.

Settings backups (manual and automatic snapshots)
Session history (e.g., start/end time, summary statistics)
Plus entitlement state (plan, verification status, expiration, etc.)

2.4 Usage analytics (Firebase Analytics)

To improve the App, we may collect anonymized usage events and related context, which can include:

In-app events (e.g., settings changes, consent flow interactions, feature usage)
Device/app context (e.g., device model, OS version, locale, app version)

The App provides an in-app setting to turn off analytics sharing (opt-out).

2.5 Crash and diagnostic data (Firebase Crashlytics, etc.)

We may collect crash reports and diagnostics to investigate issues and improve stability (e.g., stack traces, timestamps, device/OS information).

2.6 Ads and consent (Google AdMob / UMP)

The App may show ads on the free tier. For ad delivery and measurement, information may be processed, including:

Advertising-related identifiers and device signals (availability depends on OS and your settings)
In EEA/UK and other applicable regions, we may show Google UMP consent forms
Consent state (e.g., personalized/non-personalized choice, last updated time) Consent state is stored locally on the device and is not uploaded to servers.

Behavior may vary by plan (e.g., ads may be disabled for Plus users).

2.7 Purchases and billing (Google Play Billing)

Paid features (e.g., Plus subscription) are handled via Google Play. For purchase verification and entitlement updates, we may process:

Purchase identifiers such as purchase token and order ID
Verification results (e.g., active/expired, expiration time, temporary grants)

We do not directly collect your payment card details (Google Play handles payment information).

2.8 Support communications

If you contact support, we may collect:

The content you provide (messages, attachments, screenshots, logs)
Basic device/app context for troubleshooting (e.g., device model, OS version, app version, locale)

2.9 Security (App Check / Play Integrity, etc.)

To prevent abuse and protect APIs, we may use App Check / Play Integrity and process verification tokens and related metadata.

3. Purposes

We process information to:

Provide and operate the App, save settings and support cloud backup/restore
Manage Plus entitlements, verify purchases, and validate reward grants
Serve ads and manage ad consent (where applicable)
Prevent fraud and ensure security
Improve the App through analytics and diagnostics
Provide customer support

4. Sharing / Transfers to Third Parties

We may share or transfer information to service providers to operate the App, including:

Google (Firebase Authentication / Firestore / Analytics / Crashlytics / Remote Config)
Google (AdMob / UMP / Google Play Billing)
Google (Google Forms / Google Workspace for support operations)
Cloudflare (Workers endpoints for purchase verification, reward verification, and deletion requests)

Please refer to each provider's privacy policies for details.

5. Retention

We retain information only as long as necessary for the purposes described above.

Local settings: retained until you uninstall the App or clear the App's storage
Cloud backup data and other cloud data (settings backups / sessions / entitlements): retained while your account exists or until deletion is processed Session records and similar logs may be rotated or deleted periodically for operational reasons (duration may vary).
Analytics data: retained for about 90 days
Crash/major incident logs: deleted within 7 days
Support records: retained for about 90 days

6. Your Choices (Opt-out / Consent / Export / Deletion)

Analytics: you can opt out via in-app settings
Ad consent: you may review/update consent via in-app settings (where available)
Export: the App may allow exporting settings data (e.g., settings.json)
Deletion: you can request deletion ("Delete my data") via in-app settings (may require authentication). We aim to complete verified deletion requests within 30 days

7. Children's Privacy

The App is not intended for children under 13. We do not knowingly collect personal information from children under 13.

8. Security

We implement reasonable safeguards to protect information against unauthorized access, loss, or misuse.

9. Changes

We may update this Policy from time to time. Material changes will be communicated via the App or our website.

10. Contact

For privacy inquiries, contact:

Email: [email protected]
Or the in-app support form