goRPN vs ManaDecks

goRPN is an RPN calculator, with a stack modeled on the HP-16C. It is currently quite minimal, but will eventually adopt more of the functionality of the 16C. goRPN is open-source software. If you would like to contribute, get the source at https://www.github.com/joel-perry/goRPN

ManaDecks is a deck builder for competitive Magic The Gathering players who need their sideboard plans ready before every match. Building a list is only half the work. Winning also depends on knowing which cards to bring in and take out against each opponent. ManaDecks keeps those plans in one place, so preparation is straightforward. Everything starts with your decklist. You can create unlimited decks across the formats you play and save multiple versions as a list changes. Each deck keeps its own result history, so you can see whether recent changes are working. Sideboard guides are the core of the app. For any matchup you can choose which cards come in and which go out. Keep separate plans for playing first or second, preview the resulting decklist before saving, or store several plans for the same matchup as the meta shifts. You can also write a deck primer covering strategy, mulligans, and key interactions. Match results are tracked so you can measure performance over time. For competitive preparation, ManaDecks offers a look at the current metagame, including tournament decklists, results, and the archetypes showing up in supported formats. Players preparing for Friday Night Magic, RCQs, regional events, leagues, or larger tournaments keep their preparation and results in one place.