DoubleTune is an advanced tuning app created by professional musicians. It’s suitable for tuning a range of string musical instruments, learning new chords and refreshing your memory of already-learned ones. Competitive educational games are equally useful for beginners and mastered guitar players. One way or another, DoubleTune is a must-have app for any musician.

Made by experienced guitarists, it is simple, fast, intuitive and accurate. It’s perfect for tuning acoustic, electric and bass guitars, along with ukulele, banjo, violin and cello.

- Choose between a range of tuning presets and modes:
- Tune Guard™;
- Standard and Popular tunings (6 and 12 strings);
- Drop and Double Drop;
- Open, Modal and Lower;
- Ukulele tunings;
- Bass guitar tunings;
- Chromatic tuner;
- Auto and Manual modes;

Tune Guard™ is a smart feature that helps you tune safely. It warns you with both visual red signal and string highlighting when this string is too tight and is about to break. The mode is designed to help beginners and inexperienced musicians save their strings, time and money.

You can easily tune:
- Electric and Acoustic guitars;
- Western and Classic guitars;
- Bass 4 and 5 strings;
- Ukulele;
- Violin;
- Cello;
- Mandolin;
- Viola;
- Balalaika;
- Banjo;
- And any other string instruments.

Get the most out of DoubleTune games:
- Learn chords! Hone your skills and get familiar with many of common chords. These entertaining games focus on chords and chord diagrams. You can easily transfer this experience to real guitar playing!
- Ear training. Learn basics of guitar music theory in a fun way. Master your musical hearing and chord recognition ability with the help of quizzes.
- Stay competitive and try to get the best score in less time!

Great for professional and beginner guitarists! Enjoy tuning your instruments at the astoundingly high level.

The app contains the following subscription options:
- Weekly, monthly & annual*
- Free trial subscription is automatically renewed unless cancelled 24 hours before the renewal
- Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication
- Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user’s Account Settings after purchase

Privacy Policy:
Terms of Service:

*Price are equal to the value that "Apple's App Store Matrix" determines is the equivalent of the subscription price in $USD.

* Tune Guard™ feature does not guarantee 100% safely tuning. Gismart Ltd. takes no responsibility for causing any damage to your strings.

What's New

Version 3.1.1

We’ve made some app stability improvements and fixed the bugs reported by our users. Keep the app regularly updated to always have our greatest features!

Customer Reviews

4.5 out of 5

1.5K Ratings

1.5K Ratings

Perfect simple tuner


I downloaded this app probably close to a year ago and didn’t like it as much then. The ads were very annoying and I found it difficult to figure out how to set up the tuning for either other instruments or keys. I used the app again today after months of not and I’m very glad I kept it around. All I had to do was open it and start plucking my strings. It lets you know when your string is in tune and prompts you to move on to the next one until you are finished. It’s simple, easy to interact with, and most importantly, free. It’s a perfect tool for those of us who carry their phone more often than a tuner.
(P.S., the app now offers tunings in different keys and for different instruments including ukulele, bass, and 12 stringed guitars)

Extremely disappointed


I have used this app for the past two years and I loved it. I get on it after the update in September and now I have to pay to get tunings other than standard. This is a terrible mistake by you guys because I was very impressed with how well it turned my guitars but you will no longer have my service. You guys have just lost a loyal customer due to something as stupid as making people pay this much for things that used to be free.

Excellent Tuner


This app is perfect for what i need. A quick, reliable, and most importantly, accurate (the chromatic option is really precise!) tuner that i can take anywhere and use on a multitude of instruments. I highly recommend! 5 stars! 2 thumbs up! 👍👍🤘😎


Safe tuning & Cool games

Free Trial


Gismart Limited
108.7 MB
Requires iOS 9.3 or later. Compatible with iPhone, iPad, and iPod touch.
English, French, German, Italian, Japanese, Korean, Portuguese, Russian, Simplified Chinese, Spanish
Age Rating
Rated 4+
© Gismart Guitar Tuner
In-App Purchases
  1. Safe tuning & Cool games $7.99
  2. All In One $5.99
  3. Guitar $2.99


  • Family Sharing

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

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