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Guessaday

Name: Guessaday
Author: Moritz Firsching

Moritz Firsching

Guess the day of week of a random date

Games
FOSS
Free
No ads
No tracking

Android only

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A trainer for calculating the day of the week of any given date. This app displays a random date and asks you what day of the week that date is. Then it checks your answer. Optionally it measures how long it took you. In the settings you can configure the range for the random date. If you want to learn how to do this calculation, check out on the developer's website!

Developer: Moritz Firsching
Website: mo271.github.io/guessaday/
Source code: github.com/mo271/guessaday
Added to AppCosmos: 10 October 2026
License: GPL-3.0-only