Privacy Policy — TCC Coordinator

Effective date: July 17, 2026
App: TCC Coordinator (com.tcc.coordinator)
Developer: Alfonso Davila (DynMEP)
Contact: dynmep@gmail.com

TCC Coordinator is an engineering tool for time–current coordination (TCC) studies of protective devices. This policy explains what data the app collects, why, and what your choices are.

Summary

• The app works offline. Your projects and device settings are stored locally on your device.
• Signing in with a Google account is optional and only needed for cloud sync across devices.
• We do not show ads, do not use advertising or analytics trackers, and do not sell or share your data with third parties for marketing.

Data we collect

Account information (only if you sign in)

When you sign in with Google, we receive your Google account email address, display name, and a user ID through Firebase Authentication. This is used solely to identify your account and associate your synced data with it.

App content (only if you sign in)

Your coordination projects — project names, protective device settings, one-line diagram data, and study session data — are synced to Cloud Firestore (a Google Firebase service) so they are available on your other devices. If you never sign in, this data stays on your device only.

Crash and diagnostics data

The app uses Firebase Crashlytics to collect crash reports and diagnostic information (device model, OS version, app version, and stack traces) so we can find and fix bugs. Crash reports are not linked to your identity by us.

Device integrity

The app uses Firebase App Check with Google Play Integrity to verify that requests to our backend come from a genuine copy of the app. This involves sending an integrity token from your device to Google.

What we do NOT collect

• No location data
• No contacts, photos, or files outside the app
• No advertising identifiers
• No usage analytics or behavioral tracking

PDF reports and exports

Reports you export as PDF files are generated on your device and saved or shared only where you choose. They are not uploaded by the app.

Data storage and security

Cloud data is stored in Google Firebase (Firestore) and protected by Firebase security rules so that only your authenticated account can access your projects. Data is encrypted in transit (TLS) and at rest by Google's infrastructure.

Data retention and deletion

• Local data can be removed at any time by deleting projects in the app or uninstalling the app.
• Cloud data and your account can be deleted from within the app (account deletion in the projects screen). This permanently removes your account and your synced projects from our Firebase backend. Step-by-step instructions: Delete Account.
• You can also request deletion or an export of your data by emailing dynmep@gmail.com.

Third-party services

The app uses the following Google services, which process data as described above under their own privacy policies: Firebase Authentication, Cloud Firestore, Firebase Crashlytics, and Firebase App Check / Google Play Integrity — see the Google Privacy Policy and Firebase Privacy and Security.

Children

TCC Coordinator is a professional engineering tool and is not directed at children under 13.

Changes to this policy

If this policy changes materially, the updated version will be posted at this URL with a new effective date.

Contact

Questions or requests: dynmep@gmail.com