Last week I explored the question: “how many programming languages are there in the world?”. My current estimate is between 5,000 and 25,000 active computer languages.
But perhaps the number is higher, if you include all active external web APIs.
What do other people say?
Programmable Web - 18,409
RapidAPI - 7,500
Zapier - 750+
Zapier lists over 750 APIs.
What do I say?
My estimate is: between 2,000 and 25,000 active public facing web APIs.
Reproducibility Notes: My ad hoc estimates are based on checking the CodeLani database, the datasets listed above, and additional web sources.