Strings and winds
Long tones and scales over a drone, each note measured against the pure interval and the equal one when it ends.
Music
iPhone & iPad
Pure Drone: Intonation Trainer Practise intonation over a drone, and see where your notes lie
Practising intonation over a drone is what string teachers, singers and wind players recommend: the beats against the drone tell you when a note is off. Pure Drone adds what the ear cannot keep: where each of your notes actually lay, degree by degree, week after week.
Free · one-time purchase “See Your Notes” €9.99 · no subscription
Requires iOS 18.0
Screenshots
Use cases
Singers
The same for the voice: the scoop of the attack is left out, the vibrato averaged.
With a teacher
A one-page report of the last four weeks, degree by degree: which you place high, which low.
Features
Free
€0
- A warm drone on any key note, with the pure fifth if you like, at A 415 to 443
- Your pitch as a line over the degrees of the scale, each with its band of ±5 cents
- Every note you hold is judged when it ends — its middle, without the scoop of the attack, averaged over the vibrato — against the pure interval or the equal one
- This session's notes at a glance: green in tune, orange near, red off
One-time purchase “See Your Notes”
€9.99
- Each degree against both targets: "your major thirds are 8 cents high", "your sevenths are 6 cents low"
- Your history over weeks: how much was in tune day by day, and each degree this week against the week before
- A one-page PDF report for your teacher
- Listen first: the line stays hidden while you play and shows when the note ends — so you learn to hear it, not to watch a needle
- Exercises over the drone: long tones, fifths and fourths, thirds, sixths and sevenths, major and minor scales
- A drone with the third, pure or equal
Best with headphones, so the microphone hears you and not the drone.
Everything happens on your device. No account, no ads, no subscription.
Privacy
The app collects no data. Everything you open or create stays on your device until you share it yourself.
Microphone: Used only while the drone plays. The sound is analysed in memory; nothing is recorded. Your practice history stays on your device.
- No account
- No ads
- No tracking
- Works without internet
Frequently asked questions
Pure or equal – which is right?
Both, in their place. Over a drone, pure intervals sound without beats; in a melody or with a piano, equal is the reference. Every note is measured against both.
Why headphones?
With the drone on the speaker, the microphone hears the drone as well as you. With headphones it hears only you.
I bought the upgrade, but it is locked again.
Tap “Restore purchase” on the purchase card in the app. A one-time purchase is tied to your Apple account and does not have to be paid for again.
