The BOSS Tuner app brings BOSS’s trusted and world-renowned chromatic tuning technology to iOS 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 iOS 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:

What’s New

Version 1.1.0

- It corresponds to the latest OS (iOS 11).
- 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.

Ratings and Reviews

4.1 out of 5
38 Ratings

38 Ratings

RossiDucatiDominatuon ,

Finest virtual tuner from the KING- Boss (Roland)!

As a confirmed 'gear addict', I've spent the better part of 40 yrs in one of two states: playing guitar through great pedals and amps, or thinking about playing guitar through great pedals and amps- mostly always chasing tone!
After amassing a pallet's full of data, and wallowing in the embarrassment of riches that is the modern music marketplace, I've secured the finest in every category for my time (mostly) without regard to price, and after all the latest data are exhausted, and the interminable researching & obsessing concluded that despite all this, 20 yrs on: BOSS TUNERS ARE STILL FLAT OUT THE BEST, ALL-AROUND TUNERS; and a non-negotiable for touring professionals, while equally as crucial to the rank beginner, and truthfully everyone else.

Phil Phlorida ,

Iphone slow-down?

This tuner worked so well I was considering leaving my other tuners out of my guitar cases. However, a few months ago, I suddenly found that the tuner was off. It now registers my 440 tuning fork as about D#. Apple recently admitted it slowed down older iphones, which they may have done to my iphone (through IOS updates I installed?) and caused the tuner to read about 3/4 what it should. If you are going to load this on an older iphone, perhaps the IOS "updates" will screw it up.

Eriptron ,

Does what it says

For the reviewers commenting on fixing the Mode button. If you read the in app help it states that the two buttons are not functional. It's basically just a picture of the hardware pedal. You'll notice the 1/4 jacks on the side. They don't work either. ;-) The tuner works just fine!

Oh, and TC Polytune isn't on the App Store anymore that I can find FYI.


Roland Corporation
7.8 MB

Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, Japanese

Age Rating


  • Family Sharing

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

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