The App:
It’s a single screen app that has all the options on it including a slider to adjust the frequency of the “Whistle” and a bark detector! If you enjoy playing around with mosquito ringtones and seeing who can hear what, it’s worth it to be able to change the frequencies quickly.

It didn’t quite work for me with my dogs though, but I have’t had a lot of time to spend fine tunning the frequency yet. I did notice that when I played some of the frequencies that correspond to our free ringtones of the same frequency, my kids where unable to hear them as the normally do on my website. Either the frequencies are off or it’s getting changed/modified somehow. I hope to have time soon to fine tune it for my dog and see if it is a viable replacement for a dog whistle.