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Free, ad-free while you play, and paid for out of pocket. Here is the honest version.
One person. There is no company behind What the Day, no team and no investors — it is a side project I build in my own time, and everything on it, from the practice games to the Arena, was written by me.
Hosting, the database and the domain come to roughly $40 a month. That is not a scary number, but it is a real one, and it comes out of my own pocket every month whether anyone donates or not. On top of that there are the evenings and weekends — the practice games, the lessons and the daily challenge all took a lot longer to build than they look.
A one-off coffee is genuinely useful, and a few dollars a month covers a meaningful share of the bill. Both go through Buy Me a Coffee:
If money is not something you want to spend on a mental-math trainer — completely fair. Telling someone else about it, or sending me a bug report or an idea, is worth a lot too.
You will only see a support message after you have played a fair amount, and at most once every few weeks. Dismissing one hides it for a month and a half; choosing I already have stops them for good on that device. There is no ask on any screen where you have just lost a round.