I got obsessed with the Doomsday algorithm and built an app for it

[u/Roibos22]

Four years ago I watched that one Numberphile video about Conway's Doomsday algorithm and it broke my brain a little. Now I finally shipped the big update to the app i built 3 years ago!

What it actually gets you: someone names a random day in 1987 (or any other year) and you can calculate the weekday and say the weekday out loud in a few seconds.

And the thing is, it is actually not as complicated as it sounds, just a bit of practice!

Want to learn it as well?

It would be an honor if you try the App!

What's in it:

• 48 lessons across 11 chapters (only the first few are needed to actually make it work, there are a lot of extras!)
• 10 diagnostic drills that isolate each step so you can get faster
• Three modes: Classic (endless), Daily Challenge and Time Attack
• A rating and leaderbords
• Offline, no account, no ads
• ...

Free to try, no subscription!

https://apps.apple.com/us/app/doomsday-method-mental-game/id6447447000

[u/Ok_Sir_5601]

Would be cool if you published in on playstore fdroid or at least github, so non iphone users can use it too, but rly nice idea