Intervals and Chords vs Fork the Tuning Fork

Explore harmony wherever you practise. Intervals and Chords identifies possible chords from the notes you are holding and gives you immediate visual feedback on iPhone and iPad. Play the onscreen piano or connect a compatible MIDI controller to explore chords, intervals and musical notation wherever you are. SEE WHAT YOU’RE PLAYING
 • Identify complete chords and inversions 
• View note names and the intervals that shape each chord 
• Compare multiple valid interpretations of the same notes 
• See notes written on treble and bass staves
 • Highlight notes belonging to your selected major key LEARN IN CONTEXT 
Choose from 15 major keys, or use a keyless mode that prefers flats or sharps. Optional Roman-numeral scale degrees help connect each chord to the selected key. Valid chords outside that key are clearly identified without treating them as mistakes. GO DEEPER WHEN YOU’RE READY 
Advanced interpretation options can identify incomplete and rootless voicings or detect played scales. Beginner-friendly defaults keep complete chords and inversions at the top, so the most useful answers appear first. MADE FOR IPHONE AND IPAD
 Use the app as a portable music-theory companion at your instrument, in a lesson or while practising away from your desk. The interface adapts to iPhone and iPad, with support for accessible text and VoiceOver. Intervals and Chords analyses the notes currently held. It does not analyse chord progressions or attempt to determine a chord’s musical function within a composition.

Fork is a tuning fork that listens. Strike it — tap the fork, shake your phone, or knock on the body — and it rings with the long, pure decay of real brass, a haptic pulse in your hand. Then let it listen: Fork hears your instrument and shows the note, with cents deviation on an engraved scale whose brass needle settles like a balance beam. Fork knows what pitch has meant across five centuries. Tune to modern concert pitch, or to A=415 as baroque players do, 432, 442 for orchestras, 444. Choose equal temperament — or just intonation and Pythagorean tuning, with every interval derived from the historical ratios. Strike the fork in any temperament and hear the difference, or tune by the beats between the ringing fork and your instrument: the method musicians used for three hundred years. No accounts. No ads. No noise. A tuning fork, a sheet of paper, and everything a fork should know. — Strike by tap, shake, or knock; haptic feedback; natural brass decay — Listen mode: live note and cents readout from your instrument — Any chromatic note, octaves 2–6 — Reference pitches: A = 415, 432, 440, 442, 444 — Temperaments: equal, just intonation, Pythagorean — with selectable tonic — Designed for iPhone and iPad Fecit Audio — small instruments, made properly.