JustATuner

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Score7.1

Rank#4 of 32

PriceFree

Free planYes

Runs onLinux, macOS, Windows

Summary

JustATuner is a free, open-source desktop tuner for musicians, combining a stroboscopic chromatic tuner with a just-intonation drone. Its tuner shows 12 wheels, one for each pitch class, with seven concentric rings per wheel. Users can set reference pitch and instrument transposition, as well as adjust cents bias for each wheel and octave bias for each ring. The drone offers root, root-plus-fifth, major-triad, and minor-triad voicings in either a pure sine or harmonic-stack sound. A live meter displays the just-intonation interval and cents difference, and marks LOCKED when it is within 5¢ of just intonation. A Lissajous display shows interference between the played note and drone, with controls for phosphor color, trace thickness, trail count, and resolution. Pitch detection uses a microphone; the maker recommends a quality microphone and strongly recommends headphones when the drone is on. The app is listed for Windows, Linux, and macOS on Apple Silicon M1, M2, M3, and M4 chips. Linux requires PortAudio, and its downloaded binary may need executable permission.

Who it is for

JustATuner suits musicians who want to tune by ear and monitor just-intonation intervals. Its transposition presets and pitch-detection presets may be useful to players of saxophones, voice, brass, or strings.

What is good

Free and open source
Includes a chromatic stroboscopic tuner and drone
Adjustable reference pitch and instrument transposition
Live meter marks readings within 5¢ as LOCKED

What to know first

macOS support is limited to Apple Silicon M1–M4
Linux requires PortAudio
Unsigned downloads may trigger an operating-system warning

Verdict

JustATuner combines a detailed stroboscopic display with drone practice and interval monitoring. Before installing, check its platform requirements and note that the maker says the unsigned app may prompt an operating-system warning.

JustATuner plans and pricing

All plans

Free Free Desktop tuner and just-intonation drone · open source stohrermusic.com · 2 Oct 2026

Compared on musical tuner apps

Free plan: Yesstohrermusic.com
Strobe display: Yesstohrermusic.com
Custom reference pitch: Yesstohrermusic.com
Intonation monitoring: Yesstohrermusic.com
Available platforms: desktopstohrermusic.com

Facts

Product: JustATuner is a free, open-source desktop tuner for musicians with a stroboscopic tuner and a just-intonation drone.stohrermusic.com · 2 Oct 2026
Stroboscopic tuner: Its chromatic tuner has 12 wheels, one for each pitch class, with seven concentric rings per wheel.stohrermusic.com · 2 Oct 2026
Pitch settings: Users can configure reference pitch, instrument transposition, per-wheel cents bias, and per-ring octave bias.stohrermusic.com · 2 Oct 2026
Drone practice: The drone supports root, root-plus-fifth, major-triad, and minor-triad voicings, with a pure sine or harmonic-stack sound.stohrermusic.com · 2 Oct 2026
Interval analysis: A live meter reports the just-intonation interval and cents difference, and marks LOCKED within 5¢ of just intonation.stohrermusic.com · 2 Oct 2026
Visualizer: The drone’s Lissajous display visualizes interference between the played note and drone, with configurable phosphor color, trace thickness, trail count, and resolution.stohrermusic.com · 2 Oct 2026
Instrument support: Transposition options include Concert, B♭, E♭, and F, and pitch-detection presets cover saxophones, voice, brass, and strings.stohrermusic.com · 2 Oct 2026
Microphone and headphones: The app listens to a microphone for pitch detection; the maker recommends a quality microphone and strongly recommends headphones when the drone is on.stohrermusic.com · 2 Oct 2026
Supported systems: The maker lists Windows, macOS on Apple Silicon, and Linux; the macOS app is for M1, M2, M3, and M4 chips.stohrermusic.com · 2 Oct 2026
Linux requirement: Linux use requires PortAudio, and the downloaded binary may need its executable permission set.stohrermusic.com · 2 Oct 2026
Downloads and signing: Downloads are hosted on GitHub, and the maker says the app is not signed with a developer certificate, so the operating system may show a warning.stohrermusic.com · 2 Oct 2026
Source code: The source code is available on GitHub for inspection.stohrermusic.com · 2 Oct 2026
Support: The maker lists [email protected] for questions or feedback.github.com · 2 Oct 2026
Maker: The software page identifies Matt Stohrer as the maker; his About page says he moved to North Carolina in 2010 and lives between Durham and Hillsborough.stohrermusic.com · 2 Oct 2026