PianoMeter – Piano Tuner

Name: PianoMeter – Piano Tuner
Rating: 4.5 (39 reviews)
Author: Willey Piano

By: Willey Piano

Professional piano tuning

Features & Capabilities

PianoMeter is a piano tuning app that will transform your iPhone or iPad into a professional quality electronic tuning aid.

NOTE The "free" version of this app is primarily for evaluation, and it only allows you to tune notes on the piano between C3 and C5. To tune the entire piano you will need to buy an upgrade through an in-app purchase.

What makes PianoMeter unique: Unlike regular chromatic tuning apps that simply tune to a pre-calculated equal temperament, PianoMeter actively measures the tonal characteristics of each note and automatically calculates the ideal “stretch” or offset from equal temperament. In other words, it creates a custom tuning for each piano with the best compromise between intervals like fifths, fourths, octaves, and twelfths, the way aural piano tuners do when fine-tuning.

Functionality and pricing: There are three levels of functionality: a free (evaluation) version, a paid "plus" version with basic tuning functionality, and a "professional" version with features geared towards professional piano tuners. The extra functionality is unlocked through one-time in-app purchases.

The Free version includes the following limited functionality: • Tuning functionality for the mid-range of the piano only • Automatic note detection • Ability to measure each note on the piano to see how its current tuning compares to the ideal tuning curve (see if a piano is roughly in tune) • Swipe in the graphing area to show a live frequency spectrum or the inharmonicity of measured notes.

Upgrading to "Plus" adds the following functionality: • Tuning functionality for the entire piano • Tune to frequency standards other than A=440 • Tune to historical or custom temperaments • Calibrate device to an external frequency source

Upgrading to Professional unlocks all features of the "Plus" version, plus the following: • Save and load tuning files, so a piano doesn't need to be re-measured each time it is tuned • Pitch raise mode that calculates overpull for an initial first pass "rough" tuning (for pianos that are extremely flat) • Custom tuning styles: create a custom tuning curve by adjusting interval weighting and stretch • Multi-partial tone generator that plays the target frequencies • New colorful "Tonal Energy" display that shows a brief history of the pitch • Access to all future features and enhancements

Upgrade costs: Free to Plus (approximately US$30) Free to Pro (approximately US$350)

Note about permissions This app requires permission to access the microphone on your device and permission to read and write files.

User Growth & Download Statistics

App

By:

Willey Piano

Rating:

4.50

(39)

Version:

3.1.1 Last updated: 2026-04-07

Version code:

884173156

Creation date:

2020-08-04

Compatible devices:

Size:

29.42MB

URLs:

Full description:

Source:

Apple Apps Store

Data ingested on:

2026-06-06

Compare stats and ranking:

Ranking

# 216,773 ▼ 519

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Apple app. Please use these information below to contact the Apple app developer.

Developed by:

Willey Piano

Apple Apps Store

https://apps.apple.com/us/app/pianometer-piano-tuner/id1515529208

User Reviews

User reviews generally praise PianoMeter for its professional-grade tuning tools, fast note responses, and especially its visual plotting that maps every note to the keyboard. The app is seen as a strong, reliable workflow for serious tuners, with a clean UI and useful features like pitch raise and on-the-fly curves. However, recurring caveats include accuracy issues in the bass/inharmonicity mapping, occasional unreliable readings, and some bugs after updates. Pricing and licensing for the pro features are debated. Many users value the app but note a learning curve.

Pros

Strong visual plotting of notes aligned to a keyboard, giving clear, client-friendly feedback.
Professional-grade tuning with fast note response and adjustable tuning curves; features like pitch raise work well.
Clean, intuitive interface that is easy to learn with tutorials.
Works with the iPhone built-in microphone, allowing tuning without external hardware.
Widely used by professional piano tuners and supported by responsive developers with ongoing updates and features in paid versions.

Cons

Bass and inharmonicity readings can be inaccurate, with notes like C1 reported as sharp and overall bass tuning not reliable.
Pricing for the pro features is high and some capabilities, like multiple profiles, are locked behind tiers.
Reliability concerns after updates, including occasional flicker/crashes and license issues during OS updates.
Occasional measurement quirks, such as partial slips, that require correction.
Learning curve and setup complexity; users often need tutorials and practice to achieve consistent results.

Recent reviews

I've been turning my own Baldwin 5 foot 8 inch grand since the early 1970s. Using just a tuning fork. Neither the bass stretch of piano meter or piano scope is pleasing to me. I'm experimenting with tune lab trial version which gives much less stretch. But tune lab has other flaws which I'm trying to correct for. Using the pianometer app as reference– Full version.