ΣSigma Apps
Small apps that do one thing without getting in your way.
Sigma Apps is a one-person shop building focused Android utilities — no bloat, no accounts you don't need, no permissions you didn't ask for.
Built and maintained by Ahmed
First app
The one currently in progress. It solves a small, specific problem: missing calls from people you can't afford to miss.
In development
Call Volume Booster
Pick the people who matter — family, your manager, whoever — and the app raises your ringtone volume automatically the moment they call, even if your phone is on silent or turned down low. Everyone else rings normally.
Incoming call
Mom
How it'll work
Three parts, kept deliberately simple.
Choose your people
Add contacts to a short priority list straight from your phone's contact book.
Set your loud volume
Pick how loud the ringtone should get when someone on the list calls.
Stay reachable
The app watches for calls in the background and adjusts volume only when it needs to.