Just tried and it seems we have an underdog here that could be useful to avoid spammy results. I can totally see why they want this to be invite only, as they probably need to find out how to scale well. If it would go viral suddenly, they might not collapse and the whole effect would backfire.

Edit: This is really promising and interesting. They show a summary of the link when you hover over the crystal ball icon next to it, together with a button for "Block" and "Boost" - i.e. you can vote with your account. These metrics could be used for ranking and kill affiliate marketers.

I'm on the waitlist. AIUI they intend this to be a paid service eventually, which is highly desirable to me. If it can be made to work, I would very much like a search service that is directly paid for by its users, rather than funded via side channels such as advertising or paid results placement that create skewed incentives.

If they're not ready to charge for use yet, a limited preview makes more sense than a public free service.

They also have a browser that’s still in beta. Here’s the direct link to test flight: https://testflight.apple.com/join/DeC8ZDnu (got this after a month on the waitlist)

Apparently their invite, once you receive it, is free to share with anyone. Enjoy:

https://kagi.com/signup?invite_code=adfreesearchengine

It is in closed, invite-only beta.