# PianoMeter – Piano Tuner — Professional piano tuning

> Professional electronic piano tuning aid with custom temperament calculation. (iPhone/iPad app by Willey Piano.)

- Source: https://appshunter.io/ios/app/pianometer-piano-tuner/id1515529208 (this page in markdown: same URL + `.md`)
- Developer: [Willey Piano](https://appshunter.io/developer/1515529207)
- Category: Music, Utilities
- Price: Free with in-app purchases
- Rating: 4.60/5 from 41 App Store ratings · 46 written reviews indexed
- Age rating: 4+
- Requires: iOS 15 · 30 MB
- Languages: American English, Dutch, Finnish, French (France), German (Germany), Greek, Hindi, Hungarian, Italian, Japanese and 7 more
- Released: 2020-08-04
- Data updated: 2026-09-08
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/pianometer-piano-tuner/id1515529208/reviews.md

## What is PianoMeter?

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.

## Key features

- Custom piano tuning calculation
- Automatic note detection
- Tonal characteristic measurement
- Live frequency spectrum display
- Inharmonicity measurement
- Pitch raise mode
- Multi-partial tone generator

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Pro 1-year subscription | $59.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Plus to Pro | $314.99 | one-time |
| Pro version | $350.00 | one-time |
| Plus version | $29.99 | one-time |


## Recent user reviews (10 of 46)

All indexed reviews: https://appshunter.io/ios/app/pianometer-piano-tuner/id1515529208/reviews.md

### 5/5 — Anthony is Awesome!

*2026-07-22*

I’ve been learning to tune pianos and the Piano Meter app has been a fundamental tool.

The biggest plus to this app is Anthony’s desire to continue to polishing it.

I used the pitch raise feature on a Kenabe pro upright, it was within 3 cents afterwards! The custom inharmonicity curves help the piano really sing. The app has made learning to tune fun and educational!

### 2/5 — Good app but UI is lacking

*2026-06-29*

This app does an excellent job on tuning stretch but I find the UI very lacking. TuneLab has a simpler and clearer interface, and their spectrum view is especially helpful in the high treble where you can clearly distinguish false beats and duplex resonances. On this app, it’s good to have an overview of all the partials and what they are doing, but the app provides no reference to which partial it is currently tuning, and the needle and numbers swing so much they are practically useless for any sort of precision tuning. For example if it was tuning a 4:2 octave, I would like to know as to prioritize the 4th partial on account of others. The strobes are small and cluttered, making them hard to see when the phone is away on a bridge. I also wish their spectrum view is zoomed to the frequency range of the note being tuned, like TuneLab, rather than show the entire range of keyboard which in my opinion is useless. For an ETD, you have to rely on your ears a lot if you’re using this app, you might as well tune aurally.

### 5/5 — Great app

*2026-06-08*

Original post: 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. Update: at this point I'd say I prefer the stretch of pianometer, plus I don't have the patience to keep retuning the bass. I think my initial dissatisfaction was because the 1974 book I learned to tune by did not incorporate any stretch in its method, plus I was mostly playing Bach then which is confined to the middle 4 octaves . at the moment I'm only playing my own composition which uses octaves in the deepest bass. Now that I've gotten used to it it seems fine. So I've changed my rating to five stars. Makes the tuning process much simpler.

**Developer response:** Thank you for the feedback. Do you prefer having less bass stretch than PianoMeter is currently giving? If so, you might try creating your own tuning style or using the "Low stretch (PTG exam)" built-in style for your tuning. Please feel free to email me at support@pianometer.com if you have any questions or feedback.

### 5/5 — Great app

*2026-06-07*

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. Update: at this point I'd say I prefer the stretch of pianometer, plus I don't have the patience to keep retuning the bass. I think my initial dissatisfaction was because the 1974 book I learned to tune by did not incorporate any stretch in its method, plus I was mostly playing Bach then which is confined to the middle 4 octaves . at the moment I'm only playing my own composition which uses octaves in the deepest bass. Now that I've gotten used to it it seems fine. So I've changed my rating to five stars.

**Developer response:** Thank you for the feedback. Do you prefer having less bass stretch than PianoMeter is currently giving? If so, you might try creating your own tuning style or using the "Low stretch (PTG exam)" built-in style for your tuning. Please feel free to email me at support@pianometer.com if you have any questions or feedback.

### 5/5 — Outstanding App!

*2026-03-15*

Best money I’ve ever spent on an app. Used the trial version to tune a couple of octaves then immediately upgraded l. First attempt tuning my piano myself (usual tuner has been unavailable for some time) and can’t believe the result. It takes patience and a bit longer than the pros, but I trusted the tuning curve the app churned out from the notes I played in and the results are fantastic! Probably won’t be paying a tuner again anytime soon thanks to this app!

### 3/5 — OK but do your own bass stretch

*2026-03-07*

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.

**Developer response:** Thank you for the feedback. Do you prefer having less bass stretch than PianoMeter is currently giving? If so, you might try creating your own tuning style or using the "Low stretch (PTG exam)" built-in style for your tuning. Please feel free to email me at support@pianometer.com if you have any questions or feedback.

### 2/5 — Not accurate on lower octaves

*2026-02-21, version 3.0.0*

Just isn’t accurate. Sadly the best tuners cost a lot more. This is okay if you are okay with not tuning your piano.

### 3/5 — OK but do your own bass stretch

*2026-01-29*

I've been turning my own Baldwin 5 foot 8 inch grand since the early 1970s. Using just a tuning fork. I had great expectations regarding this app. I sampled every note on the piano to get the best possible result on the harmonics. And I was surprised to find that the stretch for the bass notes was slightly less than for two virtual Steinway full-size grands and my digital Yamaha. Smaller pianos are supposed to need more stretch. And so when I excitedly tried my tuning–it was unbearable because of the bass notes not being stretched enough. I downloaded the free trial of piano scope and this gave the bass 7.5 cents more stretch. And it was much more listenable although I won't know until I redo the entire tuning using piano scope. Note that the upper 3/4 of the piano seemed OK and comparable to piano scope. Suggestion: Update: a more careful analysis showed that the bottom a was 7.5 cents flat from piano meter on piano scope and this taper to zero at the second D sharp above that. Above that they were virtually identical. But even piano scope didn't even stretch enough. Piano scope made the stretch identical with my digital Yamaha, but my virtual Steinway concert grand has five cents more. Since my piano is smaller theoretically it needs more. Doing more research it seems that no one is happy with the stretch from any of these apps, even the pro versions which allow you to change the weight of the intervals. So I suggest doing a manual tuning below D sharp 2, slowly increasing the stretch from what piano meter gives you down to about 8 cents below piano meter at A zero. See online for how to do this accurately. So I suggest buying the plus version of piano meter and do your own bass stretch.  Other than that it's a great app. I have the plus version and perhaps the pro version would do the bass stretch better. In the plus version you have the option to choose the size of the piano you want but this does not, strangely, change the actual bass stretch which stays at 25.1. Maybe in the pro version it does something. But I thought sampling the inharmonicity automatically adjusted for that.

### 5/5 — My “go to” app!

*2026-01-25*

I’ve been using PM for many years now and it’s always my “go to” app. It just gets the job done and makes pianos sound great!

### 1/5 — Don't waste your money

*2026-01-16*

I've been turning my own Baldwin 5 foot 8 inch grand since the early 1970s. Using just a tuning fork. I had great expectations regarding this app. I sampled every note on the piano to get the best possible result on the harmonics. And I was surprised to find that the stretch for the bass notes was slightly less than for two virtual Steinway full-size grands and my digital Yamaha. Smaller pianos are supposed to need more stretch. And so when I excitedly tried my tuning–it was unbearable because of the bass notes not being stretched enough. I downloaded the free trial of piano scope and this gave the bass five to fifteen cents more stretch. And it was much more listenable although I won't know until I redo the entire tuning using piano scope. Note that the upper 3/4 of the piano seemed OK and comparable to piano scope. Suggestion: get the free version of piano meter which just tunes the middle of the piano for you, and then tune the upper and lower by yourself to your own satisfaction. Update: a more careful analysis showed that the bottom a was 8.5 cents flat from piano meter on piano scope and this taper to zero at the second D sharp above that. Above that they were virtually identical. Note that if you get the free app pano tuner, on my virtual and digital pianos the bottom note read 27.2 Hz. On piano scope it read 27.1 and with piano meter it was 27.3.

## Frequently asked questions about PianoMeter

### What does PianoMeter do?

PianoMeter transforms your iPhone or iPad into a professional electronic tuning aid for pianos. It actively measures the tonal characteristics of each note to calculate an ideal custom tuning, going beyond standard equal temperament.

### What are the different versions and their costs?

There is a free evaluation version with limited functionality. You can upgrade to 'Plus' for basic tuning of the entire piano (approx. US$30) or to 'Professional' for advanced features like saving tuning files and pitch raise mode (approx. US$350). These upgrades are one-time in-app purchases.

### What features are available in the free version?

The free version allows tuning of mid-range piano notes, automatic note detection, and measuring notes to compare their current tuning to an ideal curve. It also offers a live frequency spectrum and inharmonicity display.

### What are the benefits of upgrading to the Professional version?

The Professional version unlocks all 'Plus' features and adds the ability to save and load tuning files, a pitch raise mode for very flat pianos, custom tuning style creation, a multi-partial tone generator, and a 'Tonal Energy' display. It also includes access to future features.

### What permissions does the app require?

This app requires permission to access your device's microphone for sound input and permission to read and write files, likely for saving tuning data and settings.

## Version history (last 5 releases)

### 3.2.1 — 2026-08-18

• Fixed occasional freezing after a phone call or notification
• Deleted tunings can now be recovered when iCloud sync is on
• Wider range for extra treble and bass stretch, and the slider now moves in whole cents
• Minor bug fixes

### 3.2.0 — 2026-07-22

• Cloud sync (Pro): keep tuning files in sync across your Apple devices via iCloud
• Tuning history (Pro): automatic per-piano tuning records, with nearby-piano suggestions when opening files
• Audio input channel selection with external-mic indicator
• Peak View now included with Plus
• Better battery life while tuning, plus many fixes

### 3.1.1 — 2026-04-07

Bug fixes

### 3.1.0 — 2026-03-13

- Grab and spin dial to quickly change the pitch offset. (Double tap or long press on the indicator at the top of the outer ring to activate.)
- Add high resolution option for tonal energy display
- Doubled resolution for Peak View graph

### 3.0.0 — 2025-12-21

For Pro users: 
•	New Adaptive Bass Stretch auto-adjusts bass interval weights by piano size. To turn off, set Adaptive Bass Stretch to zero in Style.
•	Interval weights rescaled (all styles migrated)
•	Bulk-apply any style to all tunings (long press) 
•	New low stretch style (for PTG/RPT exam)
•	New tonal energy color palettes
•	Inharmonicity weight factor now managed in tuning styles
For all users: 
•	Improvements to unequal temperament management and inharmonicity detection

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## More apps by Willey Piano

- [PianoAudit - is it in tune?](https://appshunter.io/ios/app/pianoaudit-is-it-in-tune/id6789833467)

All apps by Willey Piano: https://appshunter.io/developer/1515529207

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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 2026-09-08.*