Yje free version or the paid version.
What do you like about it?
I have a year of the premium that my GF got for me last Christmas, but the free version has much of what I like. Also, you can use the app on a mobile device, or get one of the Bullseyes ($30) that you just push once to record your catch. In my opinion, the app is just so easy to use.
In addition to ice fishing, I fly fish and fish a lot of bass tournaments. One of the most important things I've been doing the past few years, is keeping a log, I started doing this with a pen and paper, or just the best I could from memory, but the Anglr app really streamlines it. It records a lot of information in the background (weather conditions, pressure, water data from USGS gauges if they are nearby, etc), along with allowing me to mark the exact spot I caught a fish, along with waypoints, and my own notes I'll often make, and reference if I am expecting similar conditions. Additionally, I fish a lot of tournaments on flood control reservoirs that they draw down at this time of year, so I will often walk the lakes, and mark rockpiles, brushpiles, offshore structure, etc, so I can put the coordinates on my fish finder, and come back during the summer.