8.37K reviews
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About this app

The BOSS Tuner app brings BOSS’s trusted and world-renowned chromatic tuning technology to Android mobile devices. Available as a free download, the convenient app features the familiar look and intuitive display style of the best-selling TU-3 / TU-3W pedal tuner. Using the mic in your Android device, you can tune a guitar, bass and other instruments like violin, cello, brass, etc.

- Provides hands-free chromatic tuning for a variety of instruments
- Audible reference pitch function for tuning by ear
- Supports horizontal screen to enlarge meter view
- Tuning range: A#0 (29.14 Hz)--G8 (6,271.93 Hz)
- Tuning accuracy: +/- 1 cent
- Newsfeed for the latest BOSS info

Find more BOSS tuner products at:
Updated on
Oct 20, 2017

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8.37K reviews
A Google user
January 9, 2020
The number 1 best tuner on the app store. I have litterally tried every other "best tuner app" and they were terrible. This app is easy to read and precise. It doesnt only let you tune in Standard like all the others, it is like an actual tuner that tells you what note you are playing and where you're at on the spectrum. The other tuner apps out there make you pay if you want to tune to any other tuning. Thank you so much!!!!
64 people found this review helpful
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A Google user
February 3, 2019
It's very good. Just make sure the room is quiet. Not because it's hard of hearing. But quite the opposite. It can pick up a fart from across the room. Or t.v. sounds, or conversations. It's for a quiet place only. lol. I've been playing guitar for over 12 years now. And I really would not suggest a new player buys a guitar tunner. This is free it's very good. I mean it's too. I even have an old H.T.C. phone in my case instead of my old tuner. The phone is slimmer, and can just recharge. Unlike my old korg tuner. And.sadly it's more accurate too. The only tunner I use anymore other than this app. Is a pedal tunner. Which is only for on stage purposes. When I'm plugged in and Can't use the phone. like quicly in between songs. Or when others are warming up themselves, talking or basically just a lot of background noises. But.if your just at home, or just practising. I really recommend this app. At least as a starter. If.nothing else. Compare free to $100. Then you make the call if it worth a shot or not. It you like it cool. If not then delete it and find another app or pay for a really tuner. It up to you and your preferences. For me. I'm sticking with this. I'm just writing a review because I'm installing it in another free old phone. That I'm only going to use for this duty. Just to throw this one in one of my acoustics cases.
57 people found this review helpful
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House One
July 9, 2021
[Tip use an external microphone] I was expecting much less, such as some kind of pay wall, only being able to use less than half of the features, things like that, and yet I was actually surprised & impressed by this app. It definitely exceeded my expectations. I even kinda like the catalog that it comes with. Definitely could do with out it and it wouldn't be much of a loss in any way. I just hope that they keep it updated, since we're stuck with it. I also have it on more than one device. BOSS
28 people found this review helpful
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What's new

- It corresponds to the latest OS (Android 7).
- Improved sensitivity adjustment.
- Added skin of TU-3W. You can also select existing skin (TU-3).
- Added the function to switch the status of Auto-Lock on the main screen.
- Added push notification function.