I know that many people have asked for this feature, but the app developers are not paying attention to the requests. A 15 minute pre-alert notification is very important. It’s helpful to people in so many ways; like preparing for the next salah or if they didn’t pray, then they should quickly do it. Almost all prayer time apps have this feature, I agree that your prayer app is the best out of them all, but this feature is very important for people to stay and keep on using your app. Please bring this feature as soon as possible, would be very thankful. Regards.