The leading backend as a service. Amazon’ alternative is AWS amplify.
Realtime app with one line of code with variable config in firebase.
Pricing Is 1 gigabyte of data for free with unlimited users then pay as you go at 18 cents per gigabyte and $0.06 per 100,000 database reads and $0.18 per 100,000 database writes.
The reason people use a backend as a service is so they don’t have to self-host their back end.
Fireship firebase alternatives here