Crafting Delightful Digital Experiences
DonutStudio is a just-intonation-native MIDI editor and creative DAW for microtonal, xenharmonic, and EDO music. Draw tuning relationships (3/2, 7/4, any ratio) directly between notes, and the engine retunes them as exact frequencies. Start free with the harmonic piano roll, per-note cents microtuning, clip arranger, 16-track instrument host, and the full video editor, then upgrade to DonutStudio Pro for sampling, vocal synthesis, and the score-reactive Media Machine whose generative visuals are driven by your score. The composition engine is free forever. You pay only when you take the music to market.
Free/Paid — Free workstation + paid Pro
Notes as relationships
DonutStudio grew from a tuning idea into a full production environment. It ships as a standalone app plus VST3 and CLAP plugins, with microtuning preserved on export.
Soundfonts/SFZ, a six-operator DX7-engine FM synth (OP-7), an analog-modeled VA synth (Sybil-16), and hosted VST3/CLAP plugins. Each track is independently tuned through the harmonic graph.
A Bitwig-Grid-style patch editor: build instruments and effects from control, audio, and modulation nodes with any-to-any routing, and drop external plugins in as crash-isolated nodes.
DiffSinger neural singing, UTAU voicebanks, and WORLD resynthesis (beta), all able to follow your harmonic graph. (Pro)
A grand-staff view that auto-derives Helmholtz-Ellis just-intonation accidentals straight from your link ratios.
The video editor is free, including beat-warping footage to the grid. Pro adds the score-reactive Media Machine: GLSL/ISF shader clips and a modulation matrix that routes RMS, onsets, notes, and JI link ratios into the visuals, plus GPU particles, raymarch, and per-frame scripting.
Install soundfont, shader, and footage packs without leaving the app. New libraries appear as the catalog grows.
Watch a link form
Shift-click to create a link. Double-click to cycle harmonics. Move a master and every slave follows, because the frequency is the relationship.