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OnlyPure Piano Tuner

OnlyPure Piano Tuner

Turn on and tune.

2 ratings
5 reviews
🔧 Utilities
🎵 Music
Free
In-App Purchases

Details

  • Released
  • Updated
  • September 29, 2022
  • April 23, 2026

Developer

Patrick Sebastian Stopper
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🧾$3.99 - $499.00
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About

A professional piano tuning application designed for precision and tonal purity. It offers advanced features for piano technicians, including unique temperaments and automatic inharmonicity compensation. Available in free demo, basic purchase, and premium subscription versions.

✓Professional piano tuning
✓Stopper temperament support
✓Automatic inharmonicity compensation
✓Outstanding unison purity
✓Multiple temperaments (subscription)
✓Calibration for concert pitch (subscription)
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What's New in OnlyPure Piano Tuner

2.1

April 23, 2026

New in Version 2.1: - Stabilized automatic note detection - Notes can now be changed by swiping: swipe right = +1 semitone, swipe left = -1 semitone, swipe up = +1 octave, swipe down = -1 octave — available in all note recognition modes - New display smoothing modes: strong, light, none, and adaptive. Tap the smoothing icon to cycle through modes. The new adaptive mode automatically adjusts smoothing based on cent deviation — stable near the target pitch, responsive further away. The smoothed range is adjustable via a slider (double-tap the smoothing icon)

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Subscription plans

only:pure Basic

Pure 12th Temperament & Manual note switching

$3.991 Month
14 Days trial
How to cancel OnlyPure Piano Tuner subscription ⁉️
1

In-App Purchases

$149.00

OnlyPure Basic - One-time purchase

Pure 12th Temperament & Manual note switching

User reviews

Most RecentHighest RatedLowest Rated

Eine sehr gute Software

Arbeite schon seit 2008 mit ihr und sie wird immer besser nur im tiefen bass und im hohen diskant zeigt sie kleine Probleme nimmt nicht den Ton richtig auf.Meine Kunden sind mit meinen Stimmungen sehr zufrieden
Klaviertechnik MeisterKlaviertechnik Meister

Die führende Stimm-App

Als professioneller Klavierstimmer und Nutzer der ersten Stunde (2007) bin ich bis heute von Only Pure überzeugt, seit mich das klare, ruhige und warme Klangbild begeistert hat, basierend auf reinen Duodezimen (Oktave + Quinte). Die App berechnet automatisch während des Stimmens die bei jedem Instrument unterschiedlichen Oberton-Strukturen „Inharmonizität“, so dass die Stimmung immer passt. Wir setzen Only Pure im täglichen Einsatz für unseren Konzertflügelverleih ein mit Nutzung u. a. durch Top-Künstler wie Lang Lang u. v. m. Die aktuelle App-Version ist nochmal Anwender-freundlicher optimiert worden. Sehr zu empfehlen!
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RoddieSchulterRoddieSchulter

Fails to Deliver Real Value

Tunic only: pure piano tuner offers little real value, and almost any competing option would be a better choice.
GeorgKlangGeorgKlang

Response from developer

Thank you for taking the time to leave feedback. OnlyPure is a tuning tool developed for professional piano technicians, dealing with inharmonicity and the definition of "pitch" in a non-standard way — aspects that are not addressed by most general-purpose tuning apps. We understand that different tools suit different workflows and expectations. If you would like to share specific points that did not meet your needs, we are always open to constructive feedback via our support channel.

Accuracy.

This is definitely a good app. But the reason why I gave it a four star rating is that it’s not properly calibrated to a 440. When I checked it with my other Tuning app and checked it with my Tuning for it showed that it was about, a few cycles off. I have to pull it up to A440 one to get a 440. if the developer can calibrate it to where it’s supposed to be I would give it a five star rating. As far as accuracy and tuning the piano itself it is great. Tune spin it pianos very well. Just make this one correction and it would indeed be great.
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gregieogregieo

Response from developer

Thanks for your feedback. The calibration not being exactly 440Hz at A4 is a feature - please refer to our App's description for details. Nevertheless, we figure that some users wish to have a possibility to calibrate to exactly 440Hz. We will soon publish an update that allows for manual calibration.

Tunic Only:Pure

The best piano tuner app I have tried. As an amateur, I am surprised they advertise it as only for the professional. It even allows for unison tuning non-aurally, as aural tuning can be a challenge without training. Overall, very easy to use.
GeokrasGeokras

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FAQ

What is the Stopper temperament in OnlyPure Piano Tuner?

The Stopper temperament is a unique tuning system optimized by OnlyPure Piano Tuner, based on pure duodecimes (octave + fifth) rather than traditional fifth-based temperaments. This method is valued for its clarity, stability, and musical transparency, and has been used by professionals for over 30 years.

Can OnlyPure Piano Tuner be used for free?

Yes, a Free Demo Version is available. It allows you to test the tuning engine with full measurement accuracy within one central octave (C4–C5) and experience the manual tuning workflow. However, it is intended for evaluation purposes only and not for complete piano tunings.

What are the differences between the Basic and Premium versions of OnlyPure Piano Tuner?

The Basic Version, a one-time purchase, offers the full keyboard range and manual note switching. The Premium Version, a subscription, includes the full keyboard range, automatic and chromatic note switching, additional temperaments, and calibration for concert pitch.

How does OnlyPure Piano Tuner handle string inharmonicity?

OnlyPure Piano Tuner automatically compensates for string inharmonicity, stiffness, and damping. It uses a harmonic equivalent pitch to account for the effect of inharmonicity on piano tones, ensuring consistent tonal relationships and optimal compatibility with harmonic instruments.

What devices is OnlyPure Piano Tuner compatible with?

OnlyPure Piano Tuner is available for iPhone and iPad devices. It is designed for professional use in concert halls, studios, and other professional environments.

How often is OnlyPure Piano Tuner updated?

The latest version of OnlyPure Piano Tuner is 2.0, which was last updated on March 13, 2026. This indicates a commitment to ongoing development and improvements for the application.

What is the pricing for OnlyPure Piano Tuner subscriptions?

OnlyPure Piano Tuner offers several subscription plans. The 'only:pure Basic' plan is $3.99/month or $44.99/year, both with a 14-day free trial. The 'OnlyPure Premium' plan is $7.99/month or $69.99/year, also with a 14-day free trial.

Does OnlyPure Piano Tuner have ads?

No, OnlyPure Piano Tuner does not contain advertisements. The application is designed for professional use and focuses on providing a seamless and uninterrupted tuning experience.