26 reviews
Content rating
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About this app

A-Tuner is a chromatic tuner corresponding to any instruments and boasting the highest level of accuracy among many similar applications.

Precise tuning in increments of 0.1 cents is possible with the strobe tuner like display.
It also has high precision pitch pipe (tuning fork) function which is convenient for training with tuning with ears.

We are planning to improve performance and expand functions in the future. Enjoy!

In addition to the features of the free edition (A-Tuner Lite), the following features are included.
・Note name notations (English, German, Dutch, French, Italian)
・Pitch selection mode (automatic / manual)
・Simple metronome
・Classical temperaments
 - Pythagorean temperament
 - 1/4 comma meantone
 - Pure intonation (major / minor)
 - Werckmeister III / IV / Ⅴ
 - Young Ⅰ / Ⅱ
 - Kirnberger I / II / III
 - Vallotti
 - Kellner
Updated on
Mar 23, 2022

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
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No data collected
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Ratings and reviews

26 reviews
January 7, 2020
I've used some version of this app on my desktop, laptops, tablet, and phone. The pay version is worth the price because of the features. I like this because it's simpler to choose the note you want. I am a bassist. I also play guitar, violin, and banjo. This will work with all of them! You should remember that it's not plugged in so you need a quiet place. I use an electronic tuner on stage so I can plug in. I don't think this has option to plug in. Hint!
6 people found this review helpful
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Brandon Downs
April 3, 2022
I am a practioner of sound healing. I use this to see what frequency or key my Tibetan Bowls are in, as well as checking the accuracy of certain sound healing tracks (for example, a YouTube track that claims to be 432hz can be played and this app will verify or falsify the video's Hz claim). Very useful and very accurate, thank you!
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Tom Innis
March 10, 2022
hi. why am I getting a G3 at 233.08Hz? That should be G4 shouldn't it. On piano it's Bb3 but the Alto it's G4. Also the scale running up to G on the alto sax seem to be tagged 3rd octave but the frequencies say 4th octave. Could you please clarify? Love the app btw. Thank you for the response. Please let me know when you release the result of your latest work.
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March 26, 2022
The new version (2.3.0) is now available. This version allows for negative transposition to resolve the inconvenience you pointed out. Thank you very much.

What's new

Version 2.3
* Setting dialogs can now be opened by tapping the indicator at the top of the screen.
* Negative transposition settings added for instruments in the lower and middle registers. (Paid version)
Version 2.2
* Improved volume control of tuning fork and metronome. (Paid version)
* Added "25 cents" and "50 cents" to allowable pitch error setting
* Added "Very slow (40%)" and "Super slow (20%)" to rotor speed setting
* Fixed issue where changing theme didn't take effect immediately