Do smapOne app users have a login?

A login is required for creators or users of the smapOne portal. Registration in the smapOne app (i.e. on an end device) is not required.

However, the web app version can only be used with a login.

smapOne app users can optionally log in to the self-service portal (see How do I log in to the self-service portal?). There they can view sent data and manage their own devices.