Every number your music needs, one quiet tool.
Seven studio calculators under one roof — tempo, rhythm, space, pitch, temperament, overtones and harmony. Your values stay where you left them, every tool has its own Reset, and BPM detection stays on your device.
Desktop apps work fully offline · all downloads
Seven tools. Zero noise.
Each calculator answers one studio question precisely — and every value is one click away from your clipboard.
Tempo
BPM to milliseconds and hertz from 32/1 down to 1/512 — straight, dotted and triplet. With tap tempo and local BPM detection.
120 BPM · 1/4 = 500.00 msRhythm
Euclidean pattern generator — distribute hits evenly across steps and audition grooves before you program them.
E(5,16) = x..x..x..x..x...Space
Reverb pre-delay and decay, tempo-synced delay times — dial rooms that breathe with the track.
pre-delay ≈ 62.5 msPitch
Notes to frequencies, octaves and tuning offsets — including reference pitches other than A=440.
A4 = 440.00 HzTemperament
Divide the octave into equal steps, then compare every pitch with the nearest 12-TET note or pure just interval.
9-TET · step = 133.3 ¢Overtones
The harmonic series over any fundamental — see which partials land on notes and which fall between.
f₃ = 3 × 55 Hz = 165 HzHarmony
An interactive circle of fifths — related keys, relative minors and chord functions at a glance.
F♯ min → A majRuns where you work.
Same calculator, four homes — in a browser tab next to your DAW, or as a native app on your desktop.
Web
Open Web AppTip: “Add to Home Screen” on your phone — installs like an app, works offline.
macOS
Download .zip 2.2 MBUnzip → drag to Applications. First launch: right-click the app → Open.
Windows
Download Setup 1.2 MBOr the portable .exe — no install needed. If SmartScreen appears: More info → Run anyway.
Linux
Download .deb 1.7 MBFor Debian / Ubuntu. Or the AppImage — any distro, no install 121 MB.
Free for everyone. The desktop apps are unsigned for now — on first launch use right-click → Open (Mac). AppImage: chmod +x, then run. The Windows app runs on Microsoft WebView2 — built into Windows 11, and the installer fetches it automatically if missing. ARM64 Linux (Raspberry Pi, ARM laptops): .deb · AppImage.