Hello Dave, welcome from the very top of the north of Scotland, in Caithness. Sorry do not know of their app, hopefully someone can help, this will bump the post up for you.
I'm afraid I can't help you, Dave, as I wasn't aware of its existence. It seems to have had generally favourable reviews on Google Play although like all Apps it's not perfect. There seems to be some discussion about needing a WiFi internet connection to be able to download new content. I don't know whether this is a major impediment.
I notice that it uses sound clips from the xeno-canto website which I use independently so if they are linked directly to the App it could be useful.
It's free so you've nothing to lose by downloading it to your phone and giving it a try. If you do, I think we'd appreciate some feedback on what you think of it.
Thank you Catlady. I feel bumped.
Thank you too TeeJay. Good point regarding it being free; reminds me of an old joke about God, Moses, and the Ten Commandments, but I don't think one can tell those old jokes these days.
Yes, I noticed the hook up to xeno-canto (great and very useful site). I'll install it and when I've had a moment, let you all know what I think.
Off for a walk with the Wood warblers...