This free app is designed for chicken breeders. It calculates the chicken incubation period, starting with a fingertap on the calendar. If you select the Menu "Save events and jobs into calendar", it creates calendar entries and reminders with technical parameters and ToDo´s.
First we designed an online tool: https://www.oremountainquails.com/chicken-hatching-calculator/chicken-hatching-calculator.cgi?s=EN
But we know: An app is much better!
Version 1.7 and higher has an browser module to access our webcam at RCOM 20.