I installed Poker Analytics 4, Poker Income, and RunGood. I played a few sessions and entered the data into all 4 apps.
I deleted Poker Analytics 4 first. It was definitely sleek, but there were too many gadgets for my liking, plus it’s pricey at $29.99 per year.
I liked Poker Income, but I would get hung up occasionally when entering specific player and hand data. I think it’s a nice feature to be able to track your opponents play, but it’s hard enough for me to take notes on my hands, let alone hands that I’m not involved in. I think most professional’s use this app. Inexpensive at $9.99.
Like Patrick, I use RunGood. I just found it to be the easiest to use. Simple and clean. It’s $17.99.
Be sure to try all of the free versions first. I believe most allow you to enter up to 10 sessions before you have to buy the full version.