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you forgot the most important one: haystack.it!

I would argue that every known noun are the first domains to get registered. My goal is to associate workplace search engines with haystack.

This[1] and this[2] also come to mind.

[1] https://www.spglobal.com/engineering/en/products/haystack-go...

[2] https://www.plume.com/serviceproviders/platform/haystack/

Forgive me if I don't understand, but I don't think there's a problem with multiple companies using the same common noun as the base for their domain.

Let the best product be remembered for the name.

Certainly not, presuming it doesn't escalate to the level of trademark/service mark infringement (to be fair, IANAL). Just a risk consideration...your product, your call.

But I think there's value in at least recognizing that the namespace is quite crowded given the collisions that two interweb randoms were able to identify in short order.

https://gethaystack.com/

Same idea :)

Not really, gethaystack searches your tabs

Their beta seems so

Hey.com was haystack.com in development I think