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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
- Free for first 50000 users1
- It works1
- Integrate with Google, Amazon, Twitter, Facebook, SAML1
- SDKs and code samples1
Pros of Devise
- Reliable33
- Open Source17
- Support for neo4j database4
- Secure2
Pros of OmniAuth
- Easy Social Login6
- Free3
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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
- Different Language SDKs not compatible1
- No recovery codes for MFA1
- Hard to find expiration times for tokens/codes1
- Only paid support1