I've had the app installed on my phone for like ever , & I'm not sure why I was so hesitant about using it. Anyways , I finally tried it last night and it recorded that I had 3 dreams, the only time I heard the audio cue though was when I was waking up in the morning.
I'm sure the audio cue played whilst the app detected I was dreaming, but maybe I didn't notice it in my dream?

Anyways, I posted here to see if any of you guys tried the app and had any good results, or if there is another app you recommend? I'm definitely going to try again tonight.