Remind notification-reminder service for apps?

Question

Computer networks

Greetings.
I forgot, I used the notification service, but I forgot what it's called. A very well-known service, many people know and use it. its essence is that you can set various actions like if else on android.
- if a letter has arrived, then remind
- set an alarm clock and remind, and so on.
It's hard to describe, I don't remember exactly.
The interface of this service in acid tones, it seems, was bright green.

Answer 1

I remembered, accidentally seeing in the picture - ifttt.