This app was mentioned in 5 comments, with an average of 3.60 upvotes
They have mobile apps for Android and iOS, and it allows you to record rounds and post reviews.. Here's a link to the Android version:
https://play.google.com/store/apps/details?id=com.dgcoursereview.android
Easy to pull up the course you are playing, or input a custom round. Easy to score. Nothing fancy like the udisc distance measure or other bells and whistles - but I'm personally not interested in those features. DCGR is a simple app and very easy to use. Also, you can upload your rounds to the dcgr website to keep track of them, if you so wish (I do).
And the DGCR app. https://play.google.com/store/apps/details?id=com.dgcoursereview.android
But neither come close to udisc, of you can afford it, buy it. If your buddies use it then one of you can keep score for everyone.