Exactly what you need for tuning whatever you need. The price is great and would be for much more!Thank you so much for keeping this updated!

I love this tuner and have used it for many years. Please keep it updated!

v1.3, iOS 6.1.3, iPhone 4SThis thing tunes *very* tight. For best results, you do need to reduce background noise, so a clip adapter would be nice. Can't get away from others? Simply place your phone on the instrument.I play mandolin, so there's that inherent problem of matching strings. Clip on tuners and needle-type apps leave me wondering why it sounds "off" even though the needle is centered. Not with this tuner. If it says you're in tune, you can bet on it and you can hear the difference.The display takes a moment to figure out. Just play a note and it becomes self-evident. Tweak the tuning gently and the 5 second display shows your progress. Great idea. That 5 second display may be why you can see such accurate results.I'm not sure why others want more accuracy. This is my only trusted tuner.

Some *quick* tests with my keyboard were showing this was accurate to within a few cents, which meets the needs of the vast majority of people. The running tape is nice so that you can *see* trends and errors and adjust accordingly.The "Freqencies" view is neat but has few practical applications because there isn't enough resolution in the frequency domain to gain knowledge of the frequencies--or better yet notes--that are being played. (I'm not quite sure what the page is really for other than looking neat, as it doesn't accomplish any of the use cases very well (e.g. overtone analysis, polyphonic tuning, decomposition of a polyphonic source into it's notes).Lastly, after having this on my phone for awhile I started having the "20 second" lock-up bug where everything would work fine for about 10-20 seconds and then it'd just freeze up. Deleting and reinstalling it seemed to fix the problem, and I actually suspect that the issue is with the iOS 4 multitasking, and that just killing the app and restarting (or equivalently, restarting the phone) would fix the problem as well.Overall, it is worth the purchase and is working well for my needs (tuning of a guitar, flugelhorn, and trumpet, as well as checking how in tune I am with certain trumpet trouble pitches like C#4 that need to be corrected via slides.)