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.
The one currently in progress. It solves a small, specific problem: missing calls from people you can't afford to miss.
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.
Three parts, kept deliberately simple.
Add contacts to a short priority list straight from your phone's contact book.
Pick how loud the ringtone should get when someone on the list calls.
The app watches for calls in the background and adjusts volume only when it needs to.