I'm not competing with Arena. Arena has a rules engine and great graphics. But Arena has a tonnnn of limitations and does not let you simply "build any deck you want and play with any number of friends in any format you choose." For what Arena is meant to do, Arena is better. That was never my goal.

I'm competing with Untap.in and Cockatrice, and what I built is just a much, much nicer version of those things. If you give me your email, I'll send you a link to it and you can try it out yourself if you'd like.