AutoApps is the developer of Tasker.
Ranked in these QuestionsQuestion Ranking
Pro Novel UI
The apps have iconic buttons that often appear "in-place" (e.g. when you select something from a list, the OK/cancel buttons appear as iconic pop-ups close to the list rather than at the top/bottom of the screen)
Pro Responsive yet battery efficient
Tasker doesn't drain battery significantly despite always running in the background, and it delivers the events/actions smoothly even when the phone is idle.
Pro Clean design
The "profiles" (events/conditions), "actions" and custom UI components are well-separated, resulting in a composable architecture where you can put together different pieces from each section to build your task flow.
Pro Highly flexible
You can combine a wide range of events/contexts (location, time of day, network status... even environment variables of the phone) with a similarly wide range of actions (change phone setting, launch/stop app, show message... even fire a custom intent).