Not Very User Friendly! Drains the battery extraordinarily quickly! Can't change colors to a night reading option. Black text on white background ONLY. Once app is running, other phone features are blocked or delayed. Generally speaking, this is the worst book app I have used. Which is pretty unimpressive in 2022, when the genre is well established, a there are plenty of examples out there of successful reading apps. Would migrate my novels to another system if I could.