Professionals use strobe tuners for the most precise and responsive tuning of musical instruments. See the pitch of difficult to tune instruments bend slightly sharp or flat in real-time as you tune. The display of responsive high-contrast rotating strobe visualizations enables rapid and extremely accurate tuning. More familiar-looking tuning dials and fine tuning meters are also available and visible below the two strobes. Also see notes appear on a keyboard image and a musical grand staff as a great musicianship learning aid.

Make a strobe stop spinning, and your note will be in tune with the indicated note. Spinning slightly clockwise, and this indicates that your note is slightly sharp. If the strobe is spinning too fast to see, then the note is way out of tune.

The strobe on the left does automatic note detection. The strobe on the right is set manually to one note, which is useful if there is too much background noise for automatic note detection to function properly. The popup button above the strobe on the right can be used to select the note, or you can use the up/down cursor keys to adjust the note for tuning.

For high background noise situations, a multi-strobe mode that displays strobes for all 12 chromatic notes, simultaneously, can be helpful.

For those who prefer tuning dials and fine tuning meters, those are visible below the two strobes.

The Concert A frequency can be customized in Preferences.

The approximate working range is from 2 octaves below to 2 octaves above Middle C, depending on the microphone being used and the volume settings.

For your iPhone and iPad, please see the HotPaw inTuna Strobe Guitar Tuners and iChromatic tuners in the iPhone/iOS App store.

What's New

Version 1.3.1

Minor bug fixes and graphics clean ups.

Ratings and Reviews


Seriously out of tune

I could not find a way to make this display the correct pitch. Some of the controls don't seem to work, or else I can't figure out what they're for. I've got a Peterson Strobe right here handy, but I wanted something in my computer that was easy to use, so that I didn't have to reach for anything else. Unless the creator of this is willing to show us how to make it display the right pitch (neither the right note name, nor the correct actual pitch -- it shows me to be wayyyy sharp when I'm actually holding the Peterson Strobe still. (it's calibrated daily with a tuning fork, which in turn has been checked for accuracy with many references) The microphone I use for this is not one of my expensive ones, but an inexpensive desktop mic by Blue. When using it for recording, it's hard to tell the difference between it and most mid-grade studio mics. I'm quite sure the mic is not the problem. Besides, I have many tuners associated with other software, and they all report the same pitch as the Peterson Strobe. This one is the odd one out. It's broken.

It's a nice idea, and I think it will be well worth the money if the maker will fix it. (Written on January 19, 2012 for version 1.0.2)



Nice strobe tune simulation

Works well, VERY accurate. Best and most accurate tuner I’ve used since an original strobe tuner. May be a little sensitive for some because the displays track the input instantaneously, it could use a little buffering + averaging but once I got used to it it wasn’t an issue. Moving in the right direction.


I love the concept, but it has serious issues.

I was looking for something to use to help me improve my intonation while practicing on my bass, and I came across this. Unfortunately, it is very quirky, making it slow to show a definite pitch, and I noticed that while I was playing my upright bass, it was unable to determine D and D# -- specifically, D3 and D#3. I did not take the time to check for any other problems because I have already deemed it useless to my purposes until the issues specified above are fixed.


Ronald Nicholson
1.1 MB
OS X 10.7 or later, 64-bit processor
Age Rating
Rated 4+
© 2016 HotPaw Productions


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