Terms of Use

Last updated: 11 November 2026

What the app is

Violin Metronome (package name com.violinmetron.app) is a practice tool for violinists: a tuner that follows the four open strings and stopped notes, a metronome, and a practice tab that scores intonation note by note and draws an intonation curve.

The app is a practice aid, not a substitute for a qualified teacher. Scores and per-note values are estimates calculated from microphone input; treat them as feedback, not as an exam result.

Your account

You can use the tuner, the metronome and free-play practice without an account. Signing in with Google or Facebook lets your practice records and membership follow you across devices.

You are responsible for the account you sign in with. You can delete the account at any time from the Account tab; deletion clears your name, email and avatar and anonymises the record.

Deleting the account does not cancel a Google Play subscription. Cancel it in the Play Store first.

Free and member features

Free: the tuner, the metronome with the electronic click, and free-play practice with a limited number of saved sessions.

Membership: six additional metronome tones, unlimited saved sessions, per-note attack, sustain and release analysis with the intonation curve, and the score library on hatsing.com.

Member features are for your personal practice. You may not resell, redistribute, sublicense or bundle them into another product, and you may not scrape or redistribute the score library.

Billing and renewal

In-app subscriptions are sold and charged by Google Play. Web subscriptions are sold on hatsing.com and charged by our payment provider Creem.

Subscriptions renew automatically, monthly or yearly, until you cancel. Prices are those shown at checkout, and a price change never affects a period that has already started.

Upgrading from monthly to annual replaces the plan inside the same store, which may charge the difference or prorate the remaining period. We never see or store your card details.

Refunds

Cancelling stops future renewals and keeps access until the end of the paid period. It is not a refund.

Google Play purchases follow Google Play's refund policy; web purchases follow Creem's policy. You can also write to [email protected] and we will help where we can.

If the app is unavailable for a long period because of us, you may request a pro-rata refund for the unused days from the store you bought from.

Your recordings and records

Practice recordings and practice records belong to you. Recordings stay on your device; records also sync to our server while you are signed in, so your history follows you.

We use them only to show your own history and statistics. We do not train models on them, publish them or sell them.

The share card is rendered on your device and leaves it only when you choose to share it.

Acceptable use

Do not reverse engineer, decompile or modify the app, bypass membership checks, interfere with the service, or use it to infringe copyright in music you do not have the rights to.

We may suspend or delete accounts that abuse the service or try to obtain member features without paying.

No warranty and liability

We work to keep pitch detection, timing and scoring accurate, but readings depend on your microphone, room noise, playing technique and device performance. We do not warrant that every reading is error-free.

To the extent permitted by law, we are not liable for indirect or consequential loss arising from use of the app. Nothing in these terms limits rights you have under mandatory consumer law in your country.

Changes and contact

We may update the app or these terms; the date above shows the latest version. Continuing to use the app after a change means you accept the updated terms.

Questions about these terms: [email protected].