It may struggle with Samsung's modern sleep states or devices with side-mounted fingerprint sensors.
Downloading a modified (mod) version of this app to bypass the "Pro" payment is highly discouraged for several reasons:
The app requires Device Administrator and Accessibility permissions to function. Giving these deep system permissions to an unverified modded file is a major security risk.
Typically adds about 6% extra consumption . This can spike if you use the "Rise to Wake" feature heavily.
Wakes the screen automatically when you pick up or move the device.