Part of Vivaldi Studio · iPad & Mac
Vivaldi Keyboard
An 88-key piano with twenty-two historical temperaments and twenty-one transposing instruments. Hear what your alto sax actually plays. Tune your harpsichord in 1/4-comma meantone. Compare Equal Temperament against Pythagorean, in cents, in real time.
Made for musicians, theory teachers, tuners, and historical-tuning nerds. We dare you to find this elsewhere.
What it does
Five steampunk wheels, an 88-key piano, and the math underneath. That's the whole app — and it's enough.
22 Temperaments
Equal, Just Intonation, Meantone, Well Temperaments, Historical reconstructions, Pythagorean, World scales. Switch with a turn of the wheel.
21 Transposing Instruments
Saxes, clarinets, brass, strings, woodwinds — verified MIDI ranges and correct octave transposition. The keyboard dims keys outside your instrument's range.
Concert Pitch, for real
Play a written C on Alto Sax, hear the actual E♭ concert at the temperament's exact frequency. No mental math, no approximation.
Cent Deviations Panel
See the exact offset of every note from Equal Temperament. Open the ¢ tab and watch the math.
Variable Reference Note
For non-equal temperaments, choose which key is pure. Shift the wolf, find the sweet spots.
Custom SoundFont
FluidR3 GM is bundled (142 MB). Want your own piano? Import any .sf2 from Files.
All 22 Temperaments
Seven categories. Each comes with a description in the in-app guide — what it sounds like, where it came from, why it matters.
Regular
Just Intonation
Meantone
Well Temperament
Historical
Pythagorean
World / Extended
Transposing Instruments
Twenty-one instruments with verified MIDI ranges and correct octave transposition. Pick your instrument from the wheel, and the keyboard reshapes itself: keys outside your range fade out, frequencies shift to match your concert pitch.
Play a written C on alto sax → you hear the actual concert E♭, at the exact frequency of the selected temperament. No conversion in your head. Ever.
…and more. Saxes, brass, strings, woodwinds — 21 in total.
Sounds
Five built-in timbres plus your own SoundFont. Multi-touch polyphony on iPad, click-to-play on Mac.
Piano
AVAudioUnitSampler with FluidR3 GM SoundFont (142 MB included)
Organ
Additive synthesis, baroque pipe-organ flavor
Sine
Pure sine wave — perfect for hearing temperament differences
Strings
Filtered sawtooth, sustained legato
Harpsichord
Plucked string synthesis
Custom SoundFont
Import any .sf2 file from Files. Your sample, your sound.
Reference Frequency
Configurable from 415 Hz (baroque pitch) to 466 Hz (high orchestral). Default is the modern A = 440 Hz.
Frequency updates instantly while you play. Pair it with a meantone temperament and suddenly you're rehearsing on a real harpsichord — without owning one.
How it works
Five wheels above, an 88-key piano below. That's the whole interface.
Transpose
Pick your instrument. The keyboard adjusts range and concert pitch.
Temperament
Choose a category and a sub-temperament. Twenty-two options.
Reference
For non-equal temperaments, set which key is pure.
Sound
Piano, organ, sine, strings, harpsichord, or your own .sf2.
Play
88 keys. Multi-touch on iPad, click on Mac. Pinch to zoom, two-finger drag to scroll.
Frequency calculation
MIDI note touched + concertPitchOffset (from selected instrument) = concert MIDI note baseFreq = referenceFreq × 2^((midiConcert − 69) / 12) + cent offset from temperament = final frequency
A glimpse
Steampunk wheels and an 88-key piano. Landscape, always.