Would really like to see a comparison between this and Soulver (<a href="http://www.acqualia.com/soulver/" rel="nofollow">http://www.acqualia.com/soulver/</a>). Most obvious differences are the lack of a two-column view and support for Markdown, as well as support for function definitions, which I'm pretty sure Soulver lacks.
Maybe someone reading this would be interested in my own calculator? Not as fancy as Calca for sure, by it can do functions...<p><a href="https://github.com/prog-re/klak" rel="nofollow">https://github.com/prog-re/klak</a>
Wow! This seems amazingly complete for an iOS/OS X-only app that I've never heard of before today. Is it based on some preexisting algebra system, or totally from scratch? Regardless, it's very impressive.