![](https://play-lh.googleusercontent.com/a-/ALV-UjUCqN_Di7RRDoZ-oiILRYfUmpBvK_k0SYoScjz2tXsM0Ao0ytOR=s32)
Fred Carriker
Seems to work very well, very stable and precise. However, you don't know if the source audio speaker and reception mic produce said audio accurately or not. No way to know for sure. Even with whatever source you start with, you still have to trust the author it is what they say. Eg: Said audio on internet is 1150 hz. After played on phone and picked up with another phone, app says 1152 hz. However very steady. You would have to be in a sound studio for something better!
8 people found this review helpful
![](https://play-lh.googleusercontent.com/a/ACg8ocJg9kmVjp9F6pMUAuLz0n-jsXjfelrSv5qH-dRsNOpavN5dcA=s32-mo)
Matthew Pohocsucut
Carl Reinke has as one person put it, gifted the world with his totally free application. Once you figure out how to set it up. It shows the river of sound that surrounds us. There's absolutely zero advertisements. It works online as well as offline. You don't even have to have any internet whatsoever. I will say that it is better to use multiple phones. Because some have better microphones than others. I would tell everyone that uses this to try using all of the phones that you own. Best app.
48 people found this review helpful
![](https://play-lh.googleusercontent.com/a-/ALV-UjXKIUUyxe9YNss8F6VRNZgEy80HFhvsWhlI-IHl6YXmSeAXraA=s32)
Tank R.
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Stop looking through apps, this is the one youre looking for. Period. Great specrum viewer app, I use it on many devices. Works flawlessly on all but the oldest of them(were talking android 2 era devices, so it has a pass). I've been using it for years and I still find neat ways of utilizing it. About the only thing it lacks is a record function, but you can always record the screen or screen cap.
193 people found this review helpful