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Amazon Cognito vs Keycloak: What are the differences?
Developers describe Amazon Cognito as "Securely manage and synchronize app data for your users across their mobile devices". You can create unique identities for your users through a number of public login providers (Amazon, Facebook, and Google) and also support unauthenticated guests. You can save app data locally on users’ devices allowing your applications to work even when the devices are offline. On the other hand, Keycloak is detailed as "An open source identity and access management solution". It is an Open Source Identity and Access Management For Modern Applications and Services. It adds authentication to applications and secure services with minimum fuss. No need to deal with storing users or authenticating users. It's all available out of the box.
Amazon Cognito and Keycloak belong to "User Management and Authentication" category of the tech stack.
I am working on building a platform in my company that will provide a single sign on to all of the internal products to the customer. To do that we need to build an Authorisation server to comply with the OIDC protocol. Earlier we had built the Auth server using the Spring Security OAuth project but since in Spring Security 5.x it is no longer supported we are planning to get over with it as well. Below are the 2 options that I was considering to replace the Spring Auth Server. 1. Keycloak 2. Okta 3. Auth0 Please advise which one to use.
It isn't clear if beside the AuthZ requirement you had others, but given the scenario you described my suggestion would for you to go with Keycloak. First of all because you have already an onpremise IdP and with Keycloak you could maintain that setup (if privacy is a concern). Another important point is configuration and customization: I would assume with Spring OAuth you might have had some custom logic around authentication, this can be easily reconfigured in Keycloak by leveraging SPI (https://www.keycloak.org/docs/latest/server_development/index.html#_auth_spi). Finally AuthZ as a functionality is well developed, based on standard protocols and extensible on Keycloak (https://www.keycloak.org/docs/latest/authorization_services/)
We have good experience using Keycloak for SSO with OIDC with our Spring Boot based applications. It's free, easy to install and configure, extensible - so I recommend it.
You can also use Keycloak as an Identity Broker, which enables you to handle authentication on many different identity providers of your customers. With this setup, you are able to perform authorization tasks centralized.
I started our team on Amazon Cognito because I was a Solutions Architect at AWS and found it really easy to follow the tutorials and get a basic app up and running with it.
When our team started working with it, they very quickly became frustrated because of the poor documentation. After 4 days of trying to get all the basic passwordless auth working, our lead engineer made the decision to abandon it and try Auth0... and managed to get everything implemented in 4 hours.
The consensus was that Cognito just isn't mature enough or well-documented, and that the implementation does not cater for real world use cases the way that it should. I believe Amplify has made some of this simpler, but I would still recommend Auth0 as it's been bulletproof for us, and is a sensible price.
Pros of Amazon Cognito
- Backed by Amazon14
- Manage Unique Identities7
- Work Offline4
- MFA3
- Store and Sync2
- It works1
- Integrate with Google, Amazon, Twitter, Facebook, SAML1
- SDKs and code samples1
- Free for first 50000 users1
Pros of Keycloak
- It's a open source solution32
- Supports multiple identity provider23
- OpenID and SAML support15
- Easy customisation10
- JSON web token9
- Maintained by devs at Redhat5
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Cons of Amazon Cognito
- Massive Pain to get working4
- Documentation often out of date3
- Login-UI sparsely customizable (e.g. no translation)2
- Docs are vast but mostly useless1
- MFA: there is no "forget device" function1
- Difficult to customize (basic-pack is more than humble)1
- Lacks many basic features1
- There is no "Logout" method in the API1
- No recovery codes for MFA1
- Hard to find expiration times for tokens/codes1
- Only paid support1
Cons of Keycloak
- Okta7
- Poor client side documentation6
- Lack of Code examples for client side5
