Actuary Launches Math App with no App Experience

I realised my mental math was getting worse.

I’m an actuary.
I work in Excel all day.

One day I caught myself using a calculator for 15% of 80.

That was my wake-up call.

I went looking for an app to train my brain again…
and everything I found was either made for kids or drowning in gamification.

I didn’t want a game.

I wanted something simple and fast I could use daily — like Duolingo, but for mental math.

So I built it myself. Nights and weekends later, my first app Numerlo is live 🚀

It’s a 60-second daily mental math sprint designed for professionals who want to stay sharp.

The feature I’m most excited about is the Numerlo Index — a chess-style rating for your brain that goes up as you train and drops if you stop.

Built solo. First app. Would love feedback ❤️

What score do you get in 60 seconds?