Gitlab instance as Single Sign-On service provider

Hi,

I am searching for a solution that my gitlab users can log in to another web application with the same account.

Is it possible to use my own gitlab instance (gitlab.example.com) as a Single Sign-On service provider or is it only posible to use (gitlab.com) for this?

If not, do you know any alternativs?

Regards
asopi

Can someone give me an answer?

You can use it as OAuth provider: https://docs.gitlab.com/ce/integration/oauth_provider.html