Android version here, https://play.google.com/store/apps/details?id=com.muckypuddle.soc
Apple, https://itunes.apple.com/us/app/where-to-watch-birds-scotland/id1456351759?ls=1&mt=8
The App is available for both Android and Apple devices, is free and details bird-watching sites and more around Scotland. I'd encourage anyone who doesn't record birds regularly to also have a look at the "Record Your Bird Sightings" Menu. I believe around 27 sites are covered at present in Angus.
From the Google Play Store