Anisotropic Piano Tuner

A professional piano ETD that measures per-note inharmonicity and builds an individual stretch curve for the exact instrument in front of you. Free three-octave demo.

Anisotropic Piano Tuner is a professional Electronic Tuning Device (ETD) that builds the tuning around the exact instrument in front of you.

MEASURED, NOT ASSUMED Per-note inharmonicity is measured from the live spectrum with a high-resolution FFT. Your stretch curve is calculated from those measurements — not copied from a generic piano profile.

CORE TUNING • Individual stretch curve across all 88 keys • Octave styles, or an entropy-based solver • Manual target adjustment for any key • Electronic strobe and needle meter • Stable pitch detection with an adjustable noise gate

TEMPERAMENTS • Equal plus historical temperaments: Werckmeister III, Kirnberger III, Vallotti, Young, Pythagorean, Meantone 1/4 and 1/6, Kellner • Full custom temperament editor

PITCH RAISE • Survey the instrument, calculate compensated targets and perform a preliminary pass with an adjustable over-pull factor

BEYOND PITCH • Sound-quality and stability indicators • Unison beat analysis and aural interval checks

INSTRUMENT RECORDS • Save each piano with its curve, history, notes, voice memos and reference photos • Generate a clear text report • Back up your whole library to a single file — no account, no cloud

TRY IT FREE Three complete octaves are free. Unlock all 88 keys with a monthly or yearly subscription, or a one-time lifetime purchase.

PRIVATE BY DESIGN The tuning features work fully offline. No accounts, no analytics, no advertising. Everything stays on your device.

Built-in technical help in 13 languages. Universal app for iPhone and iPad.

Anisotropic Piano Tuner offers an auto-renewing subscription (monthly or yearly) and a one-time lifetime purchase to unlock all 88 keys. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the period. Manage or cancel in your App Store account settings. Terms of Use: https://anisotropicaudio.com/terms.html Privacy Policy: https://anisotropicaudio.com/privacy.html