Is stack overflow free to use?

Yes, Stack Overflow is free to use. Users can ask and answer questions, participate in discussions, and access a wide range of programming and technology-related content without any cost. Stack Overflow also offers a reputation system, badges, and other features to encourage active and helpful participation within the community. While the basic usage of Stack Overflow is free, there are also premium features and services, such as Stack Overflow for Teams, which is a paid collaboration platform designed for companies. Stack Overflow for Teams allows organizations to have a private space for their teams to ask and answer questions in a secure and controlled environment. This, however, is a separate service with its own pricing structure.

Yes, up to workspaces with 50 users.

No; Stack Overflow for Teams is not free. See pricing here: https://stackoverflow.co/teams/pricing/

Stack Overflow FOR TEAMS is not free to use. the regular stack overflow is free to use