Does cred only work with google mail

Cred is a Google-developed authentication protocol, and it was initially designed to work specifically with Google services, including Google Mail (Gmail). However, Cred is not exclusive to Google Mail, and it can be used with other services that support the protocol.

Cred is an open-source authentication protocol, which means that anyone can implement it in their own services. In fact, Cred has been adopted by several other companies and organizations, including Microsoft, Apple, and the Linux Foundation.

Some examples of services that support Cred include:

1. Google Drive: Cred is used to authenticate users when accessing Google Drive files.
2. Google Calendar: Cred is used to authenticate users when accessing Google Calendar events.
3. Google Photos: Cred is used to authenticate users when accessing Google Photos albums and files.
4. Microsoft Azure: Cred is used to authenticate users when accessing Microsoft Azure services.
5. Apple iCloud: Cred is used to authenticate users when accessing Apple iCloud services.
6. Linux Foundation: Cred is used to authenticate users when accessing Linux Foundation services.

In addition to these services, Cred can also be used with custom applications and services that choose to implement the protocol.

It's worth noting that while Cred is an open-source protocol, it is still a Google-developed technology, and Google has a significant influence over the development and maintenance of the protocol. As a result, Cred may not be as widely adopted as other authentication protocols, such as OAuth or OpenID Connect.