8.72K 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
Apr 27, 2023

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
Learn more about how developers declare sharing
No data collected
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Data is encrypted in transit
Data can’t be deleted

Ratings and reviews

8.29K 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!!!!
110 people found this review helpful
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carl zimmerman
December 27, 2022
The visual misalignment of this is seriously annoying. Is anyone ever going to fix this? It was fine when I first got it, but it hasn't been right for years. I keep because it is still a very good tuner despite the appearance, which I do my best to ignore. It's very distracting when I know what it's supposed to look like. I've been a nearly exclusive Boss / Roland user for something like 35 years and I consider your products to be among the best, but the TU-3 tuner is a disappointment.
37 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.
87 people found this review helpful
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What's new

Improved screen.