KeyTuner is a full-range accurate and easy to use chromatic tuner that gives clear feedback with a visual design that makes maximum use of the screen. A consistent horizontal display for fine and coarse tuning allows easy tracking of the needle as a note is played. The display is suitable for both tuning and intonation practice. Quick mode provides fast confirmation in live situations. Tone generation is also supported for droning.

An advanced digital algorithm is used to allow precise tuning of all instruments (strings, woodwinds, brass, plucked string, etc). Many tuners have difficulty with low registers or those with many overtones but KeyTuner employs algorithms specifically aware of harmonic distributions. By taking advantage of the real-time behavior of multiple waveforms, vibrato can be detected and is shown as a highlighted region around the needle.

- Accuracy of 0.1 cent (0.001 semitone)
- Works with all instruments from A0 to C8
- Large easy-to-read meter for fine tuning
- Space efficient display for coarse tuning
- Quick mode for easy adjustments
- Color schemes: Light, Warm, Dark
- 3 levels of needle dampening to control responsiveness
- Temperament selection: Just, Equal-Tempered, Strings - Supports transposing instruments
- Tone/drone generation
- Concert Pitch (A4) calibration

What’s New

Version 1.8.6

Stability improvements

Ratings and Reviews

4.7 out of 5
154 Ratings

154 Ratings

nchelliah ,

The best tuner for voice

If you’re a singer working on pitch issues, get this app. I’ve tried 10 or 15 different tuners and KeyTuner is easily the best.

(1) It isn’t thrown off by wide vibrato and other pitch excursions. As a bonus, it’s still quick to detect when I’m passing through different notes, so I can use it for interval training too. With most other tuning apps, depending on their design, you’ll either get a macroscopic view that obscures any minute tuning errors, or you’ll get a microscopic view that jitters badly if you stray from one note to the next.

(2) The app remains glued to the fundamental harmonic - the pitch you’re aiming for and which our ears identify automatically. In contrast, most tuning apps simply focus on the *loudest* harmonic, which may be the second, third, or higher (depending on your voice, the note, the vowel, etc.) and generally won’t be in tune with respect to the closest note.

KeyTuner’s interface is unique but very polished, and it’s clear that lots of work has been put into the harmonic identification and time-based averaging algorithms. I haven’t needed to use this app for any other instruments but I can only imagine those modes are equally well designed. Huge kudos to the people who produced this app.

Developer Response ,

Thanks for the great review!

uApp iReview ,

Fast and easy to use

Really handy for my piano, and saved me from calling the Tuner. The app is fast, and intuitive to use. The range is impressive. And I will try it with violin next. Nice touch with the dark theme mode.

Skline1 ,

Rating screen is annoying

I really like this app and think it’s excellent however I did not want to put a rating in at this time but the rating screen kept coming up like an annoying mosquito you swat away with your hand. Each time I had to put down my cello bow and tap”NOT NOW”even though I hit not now several times it became so annoying that I decided to give it 2 stars and write this review based on the fact that you have to rate the app to use it for more than 30 seconds. I would expect that from a free app but I actually paid for this one.

Developer Response ,

Thank you for your feedback. Your concern has been addressed in version 1.1. Your feedback is always welcome.

We’re sorry about the behavior you observed. We agree it was annoying and it was certainly not intentional. TimperTuner is programmed to use iOS’s automatic system ratings API as recommended by Apple and the API should only display the rating screen very infrequently and never more than three times a year. But it clearly something was wrong and we updated TimperTuner to only call this API very infrequently.

App Privacy

The developer, TimperLabs LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Linked to You

The following data may be collected and linked to your identity:

  • Location
  • Identifiers
  • Usage Data
  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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