About Apereo CAS
Apereo CAS is an open and well-documented authentication protocol. The primary implementation of the protocol is an open-source Java server component by the same name hosted here, with support for a plethora of additional authentication protocols and features.
How many people use Apereo CAS
GitHub · npm- #1
NextAuth.js28k - #2
Passport.js24k - #3
Apereo CAS11k - #4
Amazon Cognito9.6k - #5
Microsoft Authentication4.1k - #6Userbase2.3k
- #7
Clerk1.7k
#3 of 11 Authentication we have counts for (of 31) · bars are GitHub stars across these neighbours; the category leader is NextAuth.js at 28k · as of August 30, 2026
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Apereo CAS#3 of 11 Authentication
#2 of 11 Authentication
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Implied technologies
Detecting Apereo CAS implies these are in the stack too - a report lists them alongside it.
How we audit Apereo CAS
We measure the detected version against Apereo CAS's release history and grade the surrounding stack with a Lighthouse-grade quality audit. Weak or outdated links weigh more - one risky dependency can pull the whole score down.
How the score worksMore technologies in Authentication
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