Guitar Tuner Guru

4.6
31.4K reviews
Content rating
Everyone
5M+
Downloads
Content rating
Everyone
Digital Purchases
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About this app

Get the world’s most precise guitar tuner app, Guitar Tuner Guru. Fast and accurate tuning across many instruments including guitar, bass, ukulele, violin, banjo, and more. Thanks to your mobile's built-in microphone, tuning your favorite instrument has never been so easy!

Don’t settle for less, download the ultimate guitar tuner today!

Why you'll love it:
• Get perfect guitar tuning anytime, anywhere
• Professional accuracy designed for beginners and pros
• Supports many instruments
• Chromatic tuner included
• Tune by ear with professional guitar and instrument samples
• Hundreds of alternative guitar tunings available
• String detection mode
• Change the reference frequency to get a 432Hz guitar tuner

Guitar Tuner Guru works by analyzing the signal from your smartphone’s microphone. It will work with any electric guitar, acoustic guitar, or any other string instrument you want with no cable needed. The interface shows you in real-time if you are too sharp or too flat and reacts to every change you make. It’s the perfect tuning app for beginners and pros alike.

List of included tuners:
• Guitar tuner: 6 strings, 7 strings, 8 strings, acoustic and electric
• Bass: 4, 5, and 6 string
• Ukulele
• Banjo: 4 and 5 string
• Mandolin
• Charango
• Violin and fiddle
• Balalaika
• Chromatic tuner for any other needs
Available guitar tunings in Guitar Tuner Guru include Standard tuning, Open D, Open C, Open G tunings, DADGAD tuning, Drop D, Drop C, Drop A, and many more.

Enjoy and stay tuned!

If you have any feedback, questions, or if you think some tunings or instruments are missing and would like to see them added, feel free to contact us at mobile@tabs4acoustic.com
Updated on
May 30, 2025

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.
This app may share these data types with third parties
Location, App activity and 2 others
This app may collect these data types
Location, Personal info and 3 others
Data is encrypted in transit
Data can’t be deleted

Ratings and reviews

4.6
30.5K reviews
Michael
March 2, 2026
This is a great, easy to use app. That being said, I do have three features I'd like to see added. I actually had to download the Fender Tune app as well, because it's the only tuner that seems to have open E. However, I much prefer your UI. Secondly, I build guitars as a hobby and I would like to see "intonation" tunings in the app for guitar and bass. These would be exactly 1 octave above standard pitch. Lastly, I'd like to be able to create and save my own tunings.
1 person found this review helpful
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Doug Kangas
August 14, 2022
Absolute best I've come across. Fast, Accurate, multiple tuning options from standard, drop C, Drop D, half step down, two steps down, as well as several other options. Auto string detection so you don't have to press anything if you're tuning and moving from 6th, 5th ,4th to the 1st. Not just for guitar but for bass, violin, ukulele and regular chromatic tuner. All in the free version, the ads aren't overwhelming or anything that will make you not want to use it.
113 people found this review helpful
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Ishori Yakami
June 1, 2020
It is free and easy to use having ukelele and violin that I was looking for. It has auto and manual mode. You can play the string to compare the sound if you wish to. It shows both required frequency and string sound frequency so you know what the difference is. It shows pointer as well to know whether it is high or low. Best of all I see the picture of the instrument I select and highlight the matching string when in auto mode. Thank you so much.
390 people found this review helpful
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What’s new

2.17.6 :
- Fixed a small graphical bug
- Updated libraries
2.17.5 :
- Enabled Edge-to-edge display
2.17.4
- Fixed some stability issues
- Fixed some startup crash
2.17.3
- Updated dependencies
- Removed old unused dependencies
2.17.2
- Added some missing translations
- Improved loading times in onboarding screen
2.17
- New UI version, more streamlined and easier to use
- New Onboarding Screen for new users