Vivaldi Keyboard

Keyboard & Temperaments

Free · In‑App Purchases

Play piano in 22 historical temperaments, transpose for 21 instruments, import your own SoundFonts. Now playable from any Bluetooth keyboard on iPad and Mac. Vivaldi Keyboard turns your iPad or Mac into a true-pitch keyboard for studying historical temperaments, playing transposing instruments, and hearing how intonation actually sounds. TEMPERAMENTS • 22 temperaments in 7 families — Equal (12-TET); Just Intonation (5-limit, 7-limit); Meantone (1/4, 1/3, 1/5, 1/6 and 2/7 comma); Well Temperament (Werckmeister III, Kirnberger III, Vallotti, Young, Neidhardt, Barnes); Historical (Bach/Lehman, Rameau, Kellner); Pythagorean; Extended (19-TET, 31-TET, 53-TET, Arabic 24-TET) • Live cent deviation panel — see the exact offset of every note from Equal Temperament • Variable tonic for non-equal temperaments: decide which keys are pure and which are tempered • Interactive guide with a description of every temperament TRANSPOSING INSTRUMENTS • 21 instruments with verified MIDI range and octave transposition: saxophones (soprano, alto, tenor, baritone), clarinets (Bb, Eb), trumpets (Bb, C), horn in F, trombone, tuba, flugelhorn, flute, piccolo, oboe, bassoon, violin, viola, cello, double bass • The keyboard dims the keys outside your instrument's written range, so you always see what is playable • Frequencies are transposed to real concert pitch — play a written C on alto sax, hear the actual Eb concert at the correct frequency for the chosen temperament • Pitch updates live when you change instrument or temperament mid-performance SOUNDS Two modes, switchable in Settings: • Real-time synthesis — 6 built-in timbres: Piano, Organ, Flute, Strings, Harpsichord, Bell • SoundFont playback — FluidR3 GM (142 MB) bundled, with 4 free preset as a taste of the full library: Honky-Tonk Piano, Drawbar Organ, Violin, Trumpet Multi-touch polyphony on iPad, click-and-drag glissando on Mac. REFERENCE FREQUENCY • A4 configurable from 415 Hz (baroque) to 466 Hz, 1 Hz steps • 440 Hz modern standard as default INTERFACE • Steampunk design with rotating mechanical wheels for every control • 88-key piano with zoom and horizontal scroll • Italian and English PRO UPGRADE — optional one-time €1.99, Universal Purchase iPad + Mac • Unlock the full FluidR3 GM library: all 128 General MIDI programs plus drum kits, organized by instrument family • Import your own .sf2 SoundFont files for unlimited custom sounds No ads, no subscriptions, no data collected. For musicians, transposing instrument players, music theory teachers, tuners, choir directors, baroque performers, and anyone curious about how music sounded before equal temperament. Available for iPad and Mac. Not available on iPhone.

Ratings & Reviews

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What's new in this version • Physical keyboard support (iPad with Bluetooth keyboard + Mac) - White notes: S D F G H J K L (C4–C5) - Black notes: E R Y U I (C# D# F# G# A#) - Shift octave live with [ and ] (full range C0–C8) - Choose the starting octave in Settings → "Physical keyboard" • Mac: complete pedal shortcuts - Space = Sustain (hold), Option+Space = lock - X = Sostenuto (hold), Option+X = lock - C = Soft (hold), Option+C = lock • Pedals on iPad: smoother drag-to-lock Drag a pedal forward to lock it on or off — both directions work with one natural gesture, even on iPad mini where the pedals sit close to the screen edge. • More realistic Soft pedal The Soft pedal now affects only the notes you play while it is engaged, exactly like a real piano. Notes that are already ringing (for example held by Sustain or Sostenuto) keep their original volume. • Stable audio during Siri, calls and alerts Audio interruptions are now handled correctly: the engine pauses cleanly and resumes automatically when the interruption ends. • UI polish - iPad coachmark now mentions Bluetooth keyboard support - Better pedal positioning on iPad mini - Volume slider no longer truncates "100%" - Italian rail labels ("Strumento", "Sotto-temperamento") are fully readable - Help section reorganized: physical keyboard guide added at the end • Stability Build refreshed for Swift 6 and the latest iOS / macOS toolchain. Several minor fixes under the hood. Thank you for playing — feedback is always welcome at support@vivaldistudio.app.

Version 1.29.20.05b

The developer, Goutte d'eau, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

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    Accessibility

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    Information

    Seller
    • GOUTTE DEAU SRLS
    Size
    • 154.1 MB
    Category
    • Education
    Compatibility
    Requires iPadOS 18.0 or later.
    • iPad
      Requires iPadOS 18.0 or later.
    • Mac
      Requires macOS 15.0 or later.
    • Apple Vision
      Requires visionOS 2.0 or later.
    Languages
    • English
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    • © 2026 Goutte d'eau
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

      Some in-app purchases and subscriptions may be shareable with your family group when Family Sharing is enabled. Learn More

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