I've been using Brewer's Friend for ages, and I'm a huge fan of everything but the price. I've been paying it so far, but $25 a year is really steep for me even for such a quality brewing app. That's what I'd expect to pay to own a full version of software like this outright. I could see paying $8-10 a year or even $50 for a lifetime subscription.
Aside from that gripe, it's quality software all around. I especially love the advanced water calculator and how it can import and tie directly to a recipe.