Anisotropic Audio has released Anisotropic Piano Tuner, an app that turns your iPhone or iPad into a standalone electronic piano tuning device.
The app measures per-note inharmonicity from the live spectrum and uses those measurements to calculate an individual stretch curve for the piano being tuned. Users can select a tuning style (Balanced, Octaves, Fifths, Twelfths, or Equal), run an entropy-based solver, or adjust the target of any key by dragging it directly on the curve.
Anisotropic Piano Tuner includes:
- An electronic strobe and needle meter;
- A pitch-raise workflow with register-dependent over-pull, which also compensates when lowering a piano sitting above pitch;
- A guided tuning sequence, an 88-key map of measured and tuned notes, and a reference tone;
- Equal, historical and user-defined temperaments, with the A4 reference adjustable from 415 to 466 Hz;
- Unison beat analysis, a voicing map, a stability readout and a tone report covering tuning, timbre and liveness;
- A before-and-after tuning-work score, kept in the visit history;
- Instrument records with tuning history, notes, voice memos and reference photos;
- Tuning reports and a single-file local library backup with restore;
- A built-in manual in 13 languages.
The tuning workflow runs on the device and can be used offline. The app contains no Anisotropic Audio account, analytics or advertising.
Version 1.0 requires iOS or iPadOS 15.0 or later. It is free to download and includes three complete octaves — bass, middle (with A4) and treble. Monthly, yearly and one-time lifetime in-app purchase options unlock all 88 keys; prices are localized by the App Store.
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