Hey Product Hunt 👋 I’m Pabloku, an Android developer from Spain and the maker of Numday. I built Numday because I love short daily challenges, but I wanted something more active than scrolling and more social than a classic brain-training app. Numday gives everyone the same 7-calculation chain each day. You have 90 seconds to solve it, then you can compare your result in the global ranking or in private leagues with friends, family, classmates, or coworkers. A few details: • Android-only for now • The daily challenge can be tried without an account • Sign-in is only needed for rankings and private leagues • Each challenge is short enough to become a small daily habit I’d love your feedback on three things: 1. Does the challenge feel too easy, too hard, or just right? 2. Is the onboarding clear enough? 3. Would private leagues make you come back tomorrow? Thanks for checking it out. I’ll be around today replying to comments and feedback.

Forum Threads

p/numday

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23h ago

Would you play the same 90-second math challenge as everyone else each day?

Hey Product Hunt!

I m building Numday, a daily mental math challenge for Android.

The core idea is simple: everyone gets the same chain of 7 calculations each day, has 90 seconds to solve it, and then compares scores in global rankings or private leagues with friends.

We made one product decision early: you can play first without creating an account. Sign-up only appears after you see your score and want to publish it or enter the leaderboard.

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Numday

A 90-second daily math challenge with rankings

A 90-second daily math challenge with rankings

Forum Threads

Would you play the same 90-second math challenge as everyone else each day?

Forum Threads

Would you play the same 90-second math challenge as everyone else each day?