Safe and reliable service

Amazon Cognito is easy to use and implement if you don't need to implement custom policies. But if your security team requires something outside the box, then implementation becomes complicated and you risk wasting time. There is no option for customizable regex for passwords, which is a major deficiency. The standard password policy, allow to choose the length of the password, if it should contains at least one number, one special character, one uppercase letter and one lowercase letter.

If you are looking for an affordable and first of all secure option to implement simple user login with the ability to create customizable challenges, this is the right service for you.
But if you want to add specific security policies, then you need to implement them separately, which could be challenging.