Enter two notes and get the interval instantly — perfect 5th major 3rd minor 6th augmented 4th diminished 5th and more. Interval calculator interval quiz and interval ear training in one music theory app.

Master every interval quality: perfect major minor augmented and diminished intervals — and even double triple quadruple and quintuple augmented and diminished intervals.

INTERVAL CALCULATOR
- Place two notes on the staff and see the interval name abbreviation (P5 M3 m6…) and number of semitones (half steps) at once

- The same notes appear on a piano keyboard so you see the interval on both staff and keys

- Play the two notes one after another (melodic) or together (harmonic)

- Hear the first note sing the second then check your pitch against the playback

- Treble bass alto and tenor clefs with key signatures from 6 flats to 6 sharps

- From unison and major 3rd to the tritone (augmented 4th / diminished 5th) perfect 5th and beyond — compound intervals such as 9th 10th and 13th are covered too

INTERVAL QUIZ
- Build your own quiz: key signature accidental difficulty one staff two staves or staff with keyboard clefs and number of questions

- Answer in three steps: interval number then quality (perfect major minor augmented diminished) then check the result

- Review mistakes with the wrong-answer notebook

- Track your average and best scores for each level — and the higher your score the more dazzling the fireworks!

INTERVAL EAR TRAINING
- Learn to recognize the unique "color" of each interval by ear

- Melodic intervals (notes played in sequence) or harmonic intervals (notes played together)

- Relative pitch or absolute pitch (perfect pitch) practice with several difficulty levels

- Similar-interval mode to compare easily confused intervals: 4th and 5th 2nd and 7th 3rd and 6th

- Adjust playback speed repeat count and delay between repeats

- Answer on the piano keyboard then check on the staff or in text. Turn the keyboard sound off for tougher training

- Retry your mistakes with the wrong-answer notebook

INTERVAL THEORY
Clear structured lessons with short quizzes on interval numbers melodic and harmonic intervals simple and compound intervals interval abbreviations perfect major and minor intervals augmented and diminished intervals the full interval chart how to calculate intervals enharmonic intervals and interval inversion.

MORE
- Middle C display as C4 or C3 to match your piano or DAW (MIDI 60)

- Theme colors and sound effect settings

FREE AND PREMIUM
Try the app for free. A one-time Premium purchase (no subscription) unlocks all key signatures and clefs all quiz difficulties and options and harmonic ear training with all options.

Perfect for music students choir singers instrumentalists music teachers and anyone preparing for music theory or aural skills exams.

The developer has taught students at a university music department. Drawing on that experience the app is designed to help you understand intervals in a musical and practical way.

Formerly known as "Interval Test"