When you come across a bare-bones site like id.neat.no, the first question should be: who made this? The domain registration for this site is entirely private, meaning the owner's name, address, and organization are all hidden from public records. For a personal project or a simple web app, that anonymity isn't automatically a problem, but it does make the site harder to trust if you are being asked for any kind of account access or personal data.
From a technical safety perspective, the site does the basics right. It has a valid SSL certificate and loads quickly on Google's servers. But a secure connection just means the data transfer is encrypted it doesn't tell you where that data is going or who is receiving it. The homepage itself is almost empty, showing only the word 'Orcus' with no description, no links, and no indication of what the site is supposed to do.
For a site that may be hosting user logins or identity management (given the 'id' subdomain), the total lack of a privacy policy, terms of service, or customer support contact is unusual. Most legitimate online services at least tell you what they do with your information. Without those basics, you should treat id.neat.no with caution and avoid entering any sensitive details until there is clear evidence of who runs it and why.