Librera is for people who are Android users

I'd reword this a little, to

Librera is better for people who are Android readers exclusively

Because if you're the type who uses a dedicated e-ink device for reading, also having the same application and book library on your phone has some obvious benefits. But if your phone is your one reading device, you'd probably try the Android version of KOReader and be like "wtf is with this UI?"