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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
By definition there's no "default" app because no single entity controls the whole ecosystem nor has the authority to declare that one is above another :) That aside, there is an official compliance suite, though, that at least one (often more) apps per major platform passes. Then it depends on your use-case. If you want something "mobile-first" that'd be a signal alternative, Conversations.im/Quicksy.im on Android is there, with Siskin as a good Apple-land counterpart.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.