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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.
There are no ads on this site, no signup wall in front of the game, and nothing about you is sold on to anyone. Everything is free to use without an account. That is a deliberate choice — an ad-supported learning tool ends up designed around impressions rather than around whether you actually learn anything.
Keeping it that way means the site runs on the small number of people who decide it was worth something to them.
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-maths 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.