Privacy Policy
We make learning apps that work mostly on your phone. This page says plainly what leaves it, why, and how to delete it.
Who is responsible for your data
The data controller is Jan Cebula (fluen), Poland.
Privacy contact: dev.fluen@gmail.com. We reply within 30 days.
The rule in all our apps: whatever can be done on your phone stays on your phone. We don't ask for your name, we don't sell data and we don't build advertising profiles.
Clefly – learn piano
What stays on your phone only
- Microphone audio. Clefly analyses it in real time to recognise the notes you play. Recordings are never uploaded or stored on a server.
- Songs you import to turn into sheet music. All analysis happens on the device.
- Learning progress, reviews, note statistics, your own pieces and settings.
- Data from a MIDI keyboard connected over USB.
What reaches our server
| Data | Purpose | Legal basis (GDPR) |
|---|---|---|
| Anonymous account ID (created on first launch) | So purchases, promo codes and reports have an owner | Contract |
| Email address, only if you add one | Sign-in and restoring your account on another phone | Contract |
| Subscription status and Google Play purchase history (purchase token, plan, dates) | Unlocking Clefly Pro, renewals, refunds | Contract, legal obligation |
| Promo codes you redeem | Applying the discount, preventing abuse | Contract |
| One usage statistics document (e.g. lessons done, accuracy, energy and ad use, app version, app language) | Improving the course and the app | Legitimate interest |
| Reports you choose to send (text, app version, phone model) | Replying and fixing bugs | Legitimate interest |
Data is stored with Supabase on servers in the European Union (Frankfurt) for as long as you keep your account. Purchase records are kept as long as tax law requires.
Ads (Lite plan)
The free plan shows Google AdMob ads. AdMob may use your device's advertising ID. In the EEA, the UK and Switzerland we ask for consent to personalised ads before the first ad, and you can change your choice in the app settings. Ads are limited to content suitable for everyone (rating G). Clefly Pro has no ads.
Permissions
- Microphone – recognising the notes you play, only while you use it.
- Notifications – practice reminders. Turn them off in the app or in system settings.
- Internet – account, purchases, ads.
Fluen – English tenses
What stays on your phone only
Learning progress, scores, profiles (name and avatar) and settings. Without an account, none of this is sent to a server.
What we collect if you create an account
- Email address and account ID – for sign-in and syncing progress.
- Exercise answers linked to the account – for improvement statistics.
- Sentence reports – as a counter on the exercise, without the reporter's data in question statistics.
Data is stored with Supabase on servers in the European Union. When you set a password, the app checks whether it has appeared in a data breach (Have I Been Pwned): it sends only the first 5 characters of the password's hash; the password and its full hash never leave your phone.
Ads, payments, notifications
The free version shows Google AdMob ads (Google may process the advertising ID and information about ads viewed); the Plus and Pro packages have no ads. Payments are handled by Google Play – we only receive confirmation of the purchase. Practice reminders run locally on the device.
Third parties
- Supabase (database and accounts, EU servers) – privacy policy
- Google Play (payments and subscriptions; we never see your card details) – privacy policy
- Google AdMob (ads in the free plans) – how Google uses data
Google may process data outside the EEA under Standard Contractual Clauses.
Your rights and deleting your data
Wherever you live, you can ask us for access to your data and a copy of it, correction, deletion, portability and restriction of processing, and you can object to processing based on legitimate interest. Write to dev.fluen@gmail.com. You may also complain to your local data protection authority (in Poland: UODO). Residents of California and other US states have equivalent rights to know, delete and correct; we do not sell personal information.
Fastest Delete your account and all server data in the app: Me → Account → Delete account. Details and deletion without the app: delete account.
Our apps are also meant for students. An account (email) may be added by someone aged 16 or over; younger users need consent from a parent or guardian. We do not sell user data.
We will announce changes to this policy in the app. The date at the top shows the latest change.