This app hasn't been working since I got an iPhone 5C (hence an OS upgrade). I tried everything to get it to work, and finally tonight I found their Facebook page and the solution. Why isn't it posted here?? It's a great app, but this info should be posted clearly in the app description here.Next, the developers should work on a port of the old application called "Intonation Trainer"--a great program that was marketed incorrectly that I found indispensable for teaching students how to tune chords and intervals and to make an intonation map when evaluating new horns. I think these guys could make a really elegant version.If they edit this page, I will happily add that final star….

As a replacement for my discontinued Korg tuners, this app has it all and then some. It produces a harmonically rich tone (far more useful for tuning pipe organs, which is what I use if for, than the sine wave some PC programs use) over a very wide range, can be set to various temperaments (including user-programmable ones) and is easy to calibrate. The earlier review complaining about calibration difficulties for organ tuning is just flat wrong. It does require you to calibrate on A if you want to do it audibly; otherwise there is some guess work involved, but that was the case with the Korg AT12 as well. I prefer to tune to a reference tone so I've only made limited use of the meter function - it's not as visually striking as a strobe display but it's perfectly adequate. The recent update to "pitch pipe" mode allowing you to chose notes by tapping the note name rather than spinning the virtual wheel really sealed the deal for me. I've been using Cleartune regularly throughout the holiday tuning season with entirely satisfactory results. On second thought...The recent update, while welcome even if way overdue, has eliminated some very significant features. At least on iPhone the note wheel is way too large and the tap to advance function is gone (pipe organs are often laid out in whole tones so these two features rule out "eyes free" operation). Also, the pitch unlock button is gone and so is the listen to calibrate option. I'd almost given up hope of continuing support for this app, but this update is almost worse than just letting it die. Very disappointing.

Thank You! Thank You! Thank You!!! . I’ve been a professional musician since 1980 and this is BY FAR the best and most accurate guitar tuner I’ve ever used. I was devastated when IOS 11 came out and the tuner wasn’t working. Thanks for the quick update. The temperament function really makes it worth it, too. Ever since I read an article in an article in Disc Makers Blog, I’ve used it regularly. Below is a brief section from that article:James Taylor, in order to accommodate the vagaries of acoustic guitars, tunes his strings flatter than normal. Here is his guide:High E string -3 centsB string -6 centsG string -4 centsD string -8 centsA string -10 centsLow E string -12 centsThis tuning method is also great for using a capo. Now, your mileage may vary. Your guitar is different than Taylor’s guitar. Your action may be higher. Maybe you play harder. Maybe you don’t use capos. Try it out and adjust your tuning as need be. Anyway, thanks again! This tuner is the best of any I’ve found in the App Store, and (if you’re a serious musician) is worth more than the price you are charging. Have a wonderful day! -DJG. nyc

This has been my go-to tuner for years. As a music teacher, I was able to use the app on two different devices side-by-side to demonstrate what it sounds like when two pitches go in and out of tune with each other (using the tone generator). The “unlocking” feature that removes the pitch grid is essential to the success of this lesson because the students could see the wheel move farther and farther away from the pitch and compare it with the sound waves they hear (as the waves get faster, the pitches go out of tune with one another). They LOVED it and it was an extremely effective lesson. This feature has been removed, unfortunately, and now I need to find an alternative app. Very disappointed.