Privacy Policy

Effective 2 July 2026

Clefly is built to need as little of your data as possible. There is no required account, no ad network, and no tracking. This page explains, in plain language, what little the app does collect and why.

The short version

• Your learning progress is stored on your device, not on our servers.
• The optional Friends feature uses a Sign in with Apple account. If you use it, we store your chosen display name and weekly practice totals so your friends can see them. You can delete this account, and everything with it, inside the app at any time.
• We receive anonymous usage statistics (for example, "a lesson was completed") so we can tell whether Clefly is working. They cannot be linked to you.
• We receive anonymous crash reports so we can fix bugs.
• We never sell data, show ads, or track you across other apps and websites.

What stays on your device

Everything that describes you as a learner stays local: your name as you entered it in the app, your skill-tree progress, exercise results, streaks, XP, achievements, and settings. This data lives in the app's private storage on your iPhone or iPad and is included in your normal device backups. We cannot access it.

Friends (optional account)

Clefly works fully without an account. If you choose to use the Friends feature, you create an account with Sign in with Apple so that you and the friends you invite can see each other on a small weekly leaderboard.

For Friends we store, on our servers in the Netherlands:

• an anonymous identifier that Apple gives us for your Apple ID (we never see your Apple ID itself or your password),
• the display name and avatar you choose in the app,
• your weekly practice totals (XP), your practice streak, and your best Lightning-round scores,
• who you are friends with, based on the invites you and your friends accept.

Only people you are friends with can see your display name, avatar, and these numbers. There are no public profiles and no way to search for people. Your actual learning content, such as which notes you struggle with, never leaves your device.

You can remove a friend at any time, and you can delete your Friends account in the app under Profile, Settings. Deleting the account removes your profile, friendships, and all reported numbers from our servers, and signs you out of Sign in with Apple for Clefly. Your local learning progress on the device is not affected.

Anonymous usage statistics

To understand whether Clefly actually helps people learn, the app sends a small number of anonymous events to TelemetryDeck, a privacy-focused analytics service operated by TelemetryDeck GmbH in Germany. Events include things like "app opened", "onboarding completed", and "lesson completed", together with basic technical context such as app version, device model, and system language.

These events contain no name, no email address, no location, no contacts, and no advertising identifier. TelemetryDeck identifies installations only through a one-way hashed identifier, which means neither we nor they can trace the data back to you or your device. The data is used for aggregate statistics only, such as "how many people practised this week".

Crash and performance reports

The app uses Apple's MetricKit to receive anonymous crash and hang diagnostics. These reports describe what the app was doing when it failed and contain no personal information. Apple only shares them if you have enabled "Share With App Developers" in your device settings.

Microphone

Clefly does not record audio and does not use the microphone. If a future version adds an optional feature that listens to your instrument, the sound will be analyzed on your device in real time and never recorded, stored, or transmitted, and this policy will be updated before that feature ships.

Notifications

If you turn on the daily practice reminder, it is scheduled locally on your device by the system. No notification data leaves your device, and you can turn reminders off at any time in the app or in iOS Settings.

Children

Clefly is suitable for all ages. Outside the optional Friends feature, the app collects no personal information from anyone, so it also collects none from children. The Friends feature requires a Sign in with Apple account, which Apple restricts to users who meet the minimum age for an Apple ID in their country.

Your choices

• Deleting the app deletes all locally stored progress.
• The Friends account is optional and can be deleted in the app under Profile, Settings, which removes all Friends data from our servers.
• Usage statistics are anonymous by design and cannot be looked up or linked to a person, which also means we cannot retrieve or delete "your" analytics data: there is no way to know which data would be yours.
• You can disable crash sharing system-wide in iOS Settings under Privacy & Security, then Analytics & Improvements.

Changes to this policy

If Clefly's data practices change, we will update this page and change the date at the top before the new practices take effect.

Contact

Clefly is made by Triton IT, based in the Netherlands. For any privacy question, email [email protected].