Numday
A 90-second daily math challenge with rankings
Numday launched on June 25, 2026 with 3 votes, #6,658 of 22,647 launches that month and more than 50% of that year's launches.
What it does
Numday is a 90-second daily mental math challenge for Android. Everyone gets the same 7-calculation chain each day, so scores are easy to compare. Play solo, climb the global ranking, or create private leagues to compete with friends, family, classmates, or coworkers. You can try the challenge without an account; sign in only for rankings and leagues.
Numday is a daily mental math challenge where everyone plays the same 7-calculation chain, then compares scores in global rankings and private leagues.
A 90-second mental math sprint. Everyone gets the same chain of 7 calculations, then compares speed, accuracy, and rank. No account needed to try the challenge. Sign in only when you want to publish your score, enter rankings, or keep playing after the guest limit. Open the app, start the current challenge, solve the chain, and see your score before any registration step. The ranking unlocks after you finish. Each current challenge uses the same accumulated chain, so every score is comparable inside the same window. Every correct answer becomes the next starting value. The prompt shows the full operation, like 56 + 24. Speed matters most, mistakes add a small penalty, and tied scores favor…from numday-app.com
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