Here at Haystack, we provide an industry leading cross-platform application to help obfuscate, disguise, and confuse your data that increases security by decreasing its ability to be found in a search.
Hi I'm Yuval, one of the devs behind haystack, I messed around with needl + other alternatives (e.g unleash, getcommande, glean).
I talked to Max as a user over needls privacy policy.
The biggest difference is that haystack gives you search results relevant to your query. Just like google.
needl and alts are more of a spotlight/raycast alternative, great as a productivity tool, they require you to know exactly what you're looking for beforehand, in my opinion which leaves more to be desired as a search product.
Another big differencee is around data privacy, haystack is open, free and most importantly self-hosted.
Also we allow building low code custom data connectors into haystack!