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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.
The main game, the daily challenge and the Arena are completely ad-free — no signup wall, and nothing about you is sold on. Ads keep to the quieter corners of the site, plus a short break when a practice run ends, before your results.
Those ads help with the hosting bill, but keeping the game itself ad-free still runs on the small number of people who decide it was worth something to them — and if you have chipped in, you can hide the ads entirely below.
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.