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Individual stretch curve
Per-note inharmonicity is measured from the live spectrum. Select an octave style, use the entropy solver or adjust the target of any key manually.
Professional audio software
Tools built around every instrument's acoustic signature.
Anisotropic Audio creates focused measurement tools for musicians and technicians. Explore our products, starting with a complete piano tuning workflow.
FREE DEMO Three complete octaves free. Subscribe or buy once to unlock all 88 keys.
Anisotropic Audio products
Focused software for careful listening.
Each product is built for a specific professional workflow. New products can be added without changing this page layout.
Measurement and calculation
A tuning model based on the instrument in front of you.
The application uses measured partials rather than a generic piano profile, while leaving final judgement and manual correction to the technician.
Pitch raise and lower
Survey the instrument, calculate compensated targets and perform a preliminary pass with an adjustable over-pull factor.
Stable pitch detection
A tonal trigger and adjustable gate reduce the effect of room noise and non-musical transients on the reading.
Aural interval checks
Compare calculated beat frequencies for thirds, sixths, fourths, fifths and octaves with what you hear.
Guided workflow
GUIDE follows a practical tuning sequence and advances after a stable zero reading. LOCK holds detection on the selected key.
Beyond pitch
Indicators for tone quality and stability.
The Quality and Report views summarize calculated spectral and temporal characteristics. They support comparison between measurements and do not replace aural assessment.
TUNINGPitch
deviation and consistency
deviation and consistency
TIMBRESpectrum
relative tonal brightness
relative tonal brightness
STABILITYSustain
change after the attack
change after the attack
WORKBefore → after
session comparison
session comparison
Interface
Four views. One continuous workflow.
Use the compact phone layout on the front rail or open the same measurement tools on an iPad.
Instrument records
Measurements remain useful after the tuning.
Save the instrument
Keep its tuning curve, measurements and visit history under one name.
Add context
Attach text notes, voice memos and up to ten reference photos.
Create a report
Generate a clear text summary of measurements and recorded visits.
Back up locally
Export the complete library to one file without an account or cloud service.
Pricing
Three octaves free. Unlock all 88 your way.
A single visit from a piano tuner usually costs more than a whole year of the app. Subscribe while you learn it, or own it outright — it pays for itself on the very first tuning.
Monthly
Try it, tune, cancel
All 88 keys and every feature. Cancel anytime — ideal for a one-off tuning or a trial before you commit.
Best value
Yearly
A season of clients
Everything in Monthly, for the working technician who tunes through the year.
Lifetime
Own it forever
Buy once, no subscription. The choice for full-time technicians who tune every week.
Subscription and one-time purchase are available inside the app; current prices are shown on the App Store and adjusted for your region. A free three-octave demo is included — no account required.