Numbor emerged from witnessing a close friend struggle to do 18 / 2 in their head. They got out a calculator and sat on the app for about 5 minutes. I knew then that help was needed.
The Problem
The problem was that people needed a way to practice mental math in a fun, engaging way, with an experience so simple and satisfying that it could be enjoyed daily.
The Solution
Players combine adjacent numbers to reach a target. The UI is simple and clean, with a few colours here and there to make it more visually appealing. It bares a huge resemblance to the UI of NYT games, which is intentional. It is to keep NYT users comfortable whilst also being welcoming to newcomers.
Tech Stack
The frontend is built with React and TypeScript for type safety and maintainability. The browser holds cache data to record stats, preventing the need of a whole other tool.
Play it Yourself
Play Numbor at numbor.app
notes
Numbor was built in a day as a side project. It has since gained a small but dedicated userbase of around 100 visits per day since its launch on 14/01/2026.
This project is still being actively worked on. More features and improvements are on the way!