This app was mentioned in 3 comments, with an average of 2.00 upvotes
The official Munchkin Level Counter ^(also available on iOS) This app also allows you to earn boons, one time playable effects, that can definitely be am advantage, especially late game. Costs a few dollars, but its kinda like cheating, and very VERY Munchkin
Munchkin Level Counter on Google Play for Android.
This is why everyone needs the official app, plus it has boons!
Munchkin Level Counter By Steve Jackson Games