About this app
This free 12-tone Matrix Calculator is perfect for musicians who wish to experiment with melody and harmony using the techniques of 'atonal' tone rows. The Post Tonal Calculator allows you to choose notes or generate them randomly, explore sequences of intervals as short as 3 tones and as long as a twelve-tone tone row. The Post Tonal Matrix Calculator will then generate a matrix of tone rows based on your primary row, giving you all of the possible interval-consistent prime rows, retrograde, inversions, and retrograde-inversions.
Latest release
What’s New
Play tone rows using one of four sound samples. New user settings page for saving your preferred notation, accidentals, choice of instrument and playback tempo. Performance improvements and minor bug fixes.
Audience growth
Ratings growth
Baseline captured. Growth appears after the crawler observes a changed rating count.
Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.
Price tracking
Price intelligence
First snapshot captured. The trend line starts after the next crawler price observation.
- First observed Aug 19, 2026 · 8:02 AM Free
Screenshots
