# Unison: Piano Tuner — Free pro piano tuner, unisons

> Free pro piano tuner, unisons (iPhone/iPad app by Narek Maloyan.)

- Source: https://appshunter.io/ios/app/unison-piano-tuner/id6826511686 (this page in markdown: same URL + `.md`)
- Developer: [Narek Maloyan](https://appshunter.io/developer/6815722640)
- Category: Music, Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 16.0 · 2 MB
- Languages: American English
- Released: 2026-10-31
- Data updated: 2026-11-02

## What is Unison?

A free, pro-grade piano tuner. No ads. No account. No paywall. Works offline.

Unison does the two things other tuning apps leave to your ear: setting the 2 or 3 strings of each note beat-free, and holding accuracy in the extreme treble and bass. Every feature is free, on all 88 keys.

Unisons, solved
• See the live beat rate between a note's strings, to a tenth of a hertz
• "Which string is out?": a 3-step mute flow names the left, middle or right string, and says if it is sharp or flat
• Guidance that calms to beat-free as you pull the string in

Real piano stretch
• Measure inharmonicity on a few notes; Unison fits your whole keyboard from them
• Stretch styles: 4:2, 6:3, 8:4 and 10:5 bass, 4:2, 6:3 or pure 12ths in the middle, 2:1, 4:2 or 4:1 treble
• Extra bass and treble stretch, plus custom offsets per key
• Choose the partial the tuner listens to on each key

Check any piano in 2 minutes
• Play the 8 A's or every 3rd key once
• Get the average offset, the bad notes, and if a pitch raise is needed
• Share the result card as an image

Pitch raise that respects the piano
• Pre-measure the piano, then the tuner aims each key sharp by its overpull
• Bass bridge, wound-string and strut breaks, with safety caps per section
• Or keep the piano at its current pitch with a new A4

Everything a pro expects
• Needle or strobe display, with one ring per partial
• Zoomed spectrum to see each string's peak
• Reference tone: hear any key's target as a sine or a piano-like tone, or A4 440 Hz
• Stability check: finds a pin that is not set before you move on
• Safe-turn guard warns about the wrong pin or the wrong direction
• Equal plus 7 historical temperaments, and your own custom temperaments
• Adjustable A4 (415 to 466 Hz), calibration check with a fork or a tone
• Auto-advance through the keys in 3 orders
• One file per piano with tuning history. Import and export TuneLab .tun files
• Guided first tuning and a tool guide for beginners

Private by design. Audio is analyzed on your device and never recorded, stored or sent. No sign-up. No network needed.

Built for full-time tuners, concert technicians and serious hobbyists. If Unison helps you, a rating on the App Store helps other tuners find it.

## Is Unison safe?

Not enough ratings yet to assess Unison.

## Is Unison legit?

Unison: Piano Tuner has limited verification signals. The AppsHunter Legitimacy Score for Unison is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0.0 — 2026-10-31

No release notes.

## More apps by Narek Maloyan

- [Due Date Doctor: OB Wheel EDD](https://appshunter.io/ios/app/due-date-doctor-ob-wheel-edd/id6815722638)

All apps by Narek Maloyan: https://appshunter.io/developer/6815722640

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-11-02.*