An independent app & game studio
We make cozy apps and a dungeon that does math.
Pumpkin41 is a new independent studio. Pumpkin Library is out on Google Play, with the App Store and Pumpkin Habits close behind. Arithmancy is already on Steam, waiting for your wishlist.
Pumpkin Library is out on Google Play
Apps with a mood of their own.
Pumpkin Habits
A habit tracker that starts with the reward.
Coming soon to the App Store and Google Play
Pumpkin Library
Your home library, shelf by shelf.
On Google Play now. App Store soon.
Visit the Pumpkin Library page
One-time purchase. No subscription, no ads, no tracking.
Arithmancy · Steam · 2026
A crypt that only opens for the right number.
A grid-based, first-person dungeon crawler where math is the only key.
Wishlist on SteamFor clients
We also build for other people.
Apps, games and playable experiences, made by the same hands that make ours. If you have a project, we'd like to hear about it.
Tell us about your projectContact
Write to us.
A project you want built, a question about one of the apps, a bug you found. It all lands with the people who do the work.
- We reply to every message, in English or Portuguese.
- Your details are used to answer you, and for nothing else.