just-intonation

xenharmonic & microtonal support for musescore! Just intonation, regular temperaments, chromatic staves, Bohlen-Pierce, FJS, NEJI, HEJI, HEWM, Sagittal, Johnston, Kite, ups and downs, ...

Plainsound is a sans‑serif type family of 36 fonts desgned with a quiet discipline for clarity and versatility. Integrating many OpenType features as well as Helmholtz-Ellis Just Intonation (HEJI) accidentals, Plainsound is ideal for use in articles, instruction pages and musical scores focused on microtonal music.

A complete, fast music theory library for JavaScript/TypeScript — from chord parsing and key analysis to microtonal tunings, MIDI files, notation, and audio transcription. Zero dependencies.

A pocket instrument that cannot be played badly — just intonation, an aging tape loop and a memory of its own, built for a kid on an M5Stack Cardputer-ADV (ESP32-S3)

An experimental xenharmonic piano roll application

Ratioscores allow for just-intonation playback using any General MIDI synthesizer.

Tools for working with musical intonations

A "piano roll" music editor for intuitive voice-independent tuning.

Alternate Tuning Systems in Pure Data (Pd). The library is designed for tuning system demonstrations and how to build them with Pd in the music technology or music theory classroom.

Rust utilities for working with Just Intonation tuning systems

A drone-ambient synthesizer for slowly breathing clusters: just intonation, a conductor that plays all night, distance as the one number that shapes every voice, 24 source types, three reverb tiers, and 14592 presets measured by rendering them. Framework-free C++20 core, JUCE shell. VST3 + standalone.

Just-intonation, 5-limit tuning, blues-scale musical keyboard based on WebAudio

一个为Minecraft添加微分音支持的Fabric mod / A Minecraft Fabric mod for xenharmonic music

Just intonation classes for music theory experiments in Python

jinx: an interactive learning toolkit for tuning theory

Just Intonation Synthesizer (X11+ALSA)

A web app for automatic interval approximation using an arbitrary set of basis intervals. It finds optimal mappings from points in 1D pitch space to those in a multidimensional tuning lattice.

Audio from plain text

A keyboard layout and synthesizer using just intonation.

DonutStudio: a free, closed-source harmonic composition workstation and JI-native MIDI editor (microtonal, xenharmonic, EDO). Harmonic link chains, Scala, MTS-ESP, 16-track host, VST3/CLAP. Public dev resources: Lua scripting API, MCP server for AI agents, skills for Claude Code/Cursor/Codex.