3 stars: The app is good, but after a few days it doesn't work properly anymore. Like when you open it, an add will appear then after that, when you choose the instrument and stuff, it doesn't move anymore, it gets stuck on one chord. I don't know if it's my phone or the app, but I have tried refreshing it so maybe it's the app. Please try and fix it...
5 stars: Really awesome, very fast and precise with a solid no nonsense user interface. I'm tuning guitars and analog synths and it's perfect for both. Responsive, easy to read and resilient to noise (even correctly identifies chords). A quality app with a solid algorithm at its core. Highly recommended.
5 stars: (Edit: I have updated the app and it's working now) I wanted to write this so I can try and get to the developers, the app is very good! But in the recent couple days I've beem having trouble launching the app, it simply doesn't, and I have to clear all data everytime I want to use it. Please fix it, otherwise it's a great app for what I need.
5 stars: I've had the free version of this app on my phone for a few years and use it occasionally to check tuning on guitar, piano, and violin. It's highly configurable and has a clean and responsive display.
3 stars: Excellent tuner. Diminished by the need to be connected to the internet for adds or it doesn't work at all. Stuffs the idea of tuning while out on a camp...
3 stars: The best app I've found for tuning a piano. I'll probably buy the full version...