Gstring tuner
Gstring tuner, a chromatic guitar tuner, perfectly tune the guitar, but also can be used for ukulele, bass, violin, and piano (Equal Temperament).
Who is the Gstring tuner suitable for?
For those who is a guitar beginner, just bought a guitar, or have never tuned the instrument before, Gstring tuner is your best choice. But we recommend you to choose the manual mode, not the automatic mode, in which way you can tune the string you need to tune one by one. Simple and fast. Of course, if you know every pitch of 6 strings of guitar well, you can use the automatic mode, which is faster.
As for those who already begin to learn guitar, ukulele, bass, or violin, and have acquired some basic knowledge of music, well, you can use the automatic mode directly to tune your instrument.
If you are quite familiar with the instrument and know which sounds are necessary for your tuning, you can use the same Equal Temperament to tune all the instruments, and it's very easy.
While you are familiar with all the instruments, it only takes 2 minutes to get your guitar tuned. This is what a tuning master can do. And if you have the Gstring tuner, you can become a tuning master immediately on the first day of learning the instrument. Is it amazing?
Of course yes! The reason lies in its world's fastest calculation speed (0.01s to obtain a frequency), the most accurate accuracy (0.01 cents), the most stable algorithm (the recognition accuracy of the fundamental wave is 99.9%), so it is the best tuner APP, beyond all other tuning applications.
Finally, can it be used for piano? Well, it can. However, if you are not a professional tuner, we recommend you just to use it to check whether your piano is in tune, and it will tell you when you should go to a piano tuner. It is especially suggested that you should be very careful, since changing the piano strings can be a big trouble. But if you trust that you can tune your complex piano strings, of course you can use it to perfectly tune the piano.
Except tuning, what else function does it have?
Tone generator. With the ability of making the corresponding sound continuously as a reference, in which case it is equivalent to a tuning fork, you can try tuning with your ears as you want.
Maybe you still need to adjust the parameters?
For example, A4, nation, temperament, left hand? It can meets all your need.
At the end, look at its tuner mode:
All guitar modes:
*General Tunings
*Lower Tunings
*Higher Tunings
*Dropped Tunings
*Double-dropped Tunings
*Major Open Tunings/Cross-note Tunings
*Modal Tunings
*Miscellaneous Tunings
All ukulele modes :
*Ukulele Tunings
-C Tuning
-C Tuning (Linear/Low G/Tenor C)
-D Tuning (High A/Soprano/Concert)
-D Tuning (Linear/Low A)
-G tuning (High D/Baritone)
-G tuning ( Low D/Tenor G)
-Slide Ukulele Tuning
-Soprano F Tuning
-Soprano G Tuning
-Slack Key Tuning(High G)
-Slack Key Tuning(Low G)
All bass modes :
*4-String Bass Tunings
-Whole Step Down
-Drop D
-Drop C
-Drop D/G
All violin, viola, cello modes :
*Violin Tunings
-Standard Tuning(Violin)
-Tenor Violin(Violin)
-Cajun tuning(Violin)
-Open G tuning(Violin)
-Sawmill tuning(Violin)
-Gee - dad(Violin)
-Old-timey D tuning(Violin)
-Cross Tuning(Violin)
*Viola Tunings
*Cello Tunings
*Bass Tunings
-Standard(Double Bass)
-Solo(Double Bass)
All piano transpositions :
*all transpositions
Use the top rated chromatic tuner on the App Store, let it be your best instrument learning partner!

What’s New

Version 4.2.0

Optimize performance
Support ios13
Update core algorithm
Fix bug

Ratings and Reviews

4.6 out of 5
480 Ratings

480 Ratings

Centerofthepitch ,

Good tuner... Nothing fancy but it works!

This is surprisingly a very refined top notch app. It is not great of I are a lower strong player say, a cellist or a violist but for the practicing brass doctorate it really helps you find the center of the pitch. I recommend this to students an teachers alike!

Missy2128 ,


So it is pretty useful but if I tie it looser then it tells me to tie it tighter then when I get it onto the right note I can barely see if I’m supposed to tighten it if I’m supposed to make it lower. It is pretty hard to see if you’re supposed to tighten it or loosen it. I would say that it would be better if you did not use this app sometimes I have to even try to get my face closer to my screen to see what it says because it goes so fast. Do NOT USE THIS APP!!!!!!!!

Sweet medicine! ,

Love this app

I am new to the violin and I sometimes don’t know if I should tighten a string or loosen it. This app takes all the guess work out. It tells me what to do and I can play my violin in tune. Love iT!


Haochang Huang
131.7 MB

Requires iOS 10.0 or later. Compatible with iPhone 5S, iPhone 6, iPhone 6 Plus, iPhone 6S, iPhone 6S Plus, iPhone SE, iPhone 7, iPhone 7 Plus, iPhone 8, iPhone 8 Plus, iPhone X, iPhone XS, iPhone XS Max, iPhone XR, iPhone 11, iPhone 11 Pro, iPhone 11 Pro Max, iPad Air, iPad Air Wi-Fi + Cellular, iPad mini 2, iPad mini 2 Wi-Fi + Cellular, iPad Air 2, iPad Air 2 Wi-Fi + Cellular, iPad mini 3, iPad mini 3 Wi-Fi + Cellular, iPad mini 4, iPad mini 4 Wi-Fi + Cellular, iPad Pro (12.9-inch), iPad Pro (12.9-inch) Wi-Fi + Cellular, iPad Pro (9.7‑inch), iPad Pro (9.7-inch) Wi‑Fi + Cellular, iPad (5th generation), iPad (5th generation) Wi‑Fi + Cellular, iPad Pro (12.9‑inch) (2nd generation), iPad Pro (12.9‑inch) (2nd generation) Wi‑Fi + Cellular, iPad Pro (10.5‑inch), iPad Pro (10.5-inch) Wi‑Fi + Cellular, iPad (6th generation), iPad Wi-Fi + Cellular (6th generation), iPad Pro (11-inch), iPad Pro (11-inch) Wi-Fi + Cellular, iPad Pro (12.9-inch) (3rd generation), iPad Pro (12.9-inch) (3rd generation) Wi-Fi + Cellular, iPad mini (5th generation), iPad mini (5th generation) Wi-Fi + Cellular, iPad Air (3rd generation), iPad Air (3rd generation) Wi-Fi + Cellular, iPad (7th generation), iPad (7th generation) Wi-Fi + Cellular, and iPod touch.


English, Arabic, French, German, Italian, Japanese, Korean, Portuguese, Russian, Simplified Chinese, Spanish, Traditional Chinese

Age Rating
In-App Purchases
  1. Full Version $9.99
  2. Guitar tuner Pro $2.99
  3. bass tuner Pro $2.99


  • Family Sharing

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

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