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 1.8.1

Minor fixes and improvements

Ratings and Reviews

4.7 out of 5
119 Ratings

119 Ratings

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.

BabyChris Productions ,

Best app of the lot

I tried several apps to help me tune my piano. This one was the best in that the needle didn’t jump all over. It was really easy to see and use.

Developer Response ,

Thanks for the review. We're very glad it works for you!


TimperLabs LLC
21.8 MB

Requires iOS 12.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, Japanese, Simplified Chinese

Age Rating


  • Family Sharing

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

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