Today’s List of Paid Apps That Are Free on the Play Store Including AppLock: Fingerprint and More
https://wccftech.com/todays-list-of-paid-apps-that-are-free-on-the-play-store-including-applock-fingerprint-and-more/
Not the best selection of apps, I’ll admit, but you might like one or two, hopefully.
This app is the pro version of “Matrix Determinant Calculator”, completely without advertisement!