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Putting user satisfaction in the chart and not backing it with sources (I know at least a handful of companies who are very satisfied with e.g. KeyCloak) does not instill lots of confidence in the product differentiation. And what does customizability mean? KeyCloak has a rich Plugin system.

Other than that it seems to be quite equal, if you discount the more difficult things in Auth like providing standardized APIs, OAuth2 APIs and SCIM.

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Yes, its a very subjective point.

We've mentioned the source (if you hover) and it is based on our internal user research and conversations with users of these products. By no means is it perfect and there are many many satisfied customers of each of the other products.

Your point is taken though and maybe we will edit that point out or try to add further nuance.

I do believe however that broadly speaking, that reviews of keycloak lean towards it being relatively harder to use and maintain than Firebase. Arguably the reviews of Cognito are more mixed than "Low"

It's tricky to make these marketing charts objective. It would be good to have a real comparison somewhere.

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