I would suggest to add the adult appendicitis score It is more sensitive and specific as the Alvarado score which is in the app

Original article:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4087125/

Comparaison with Alvarado
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10413131/

Calculator
https://appendicitisscore.com/