Disclaimer: I work at Diffbot

Major differences I can see (OP feel free to correct if I'm wrong):

Link.fish

* doesn't provide a web crawler

* relies heavily on microdata, schema.org, RDFa, etc

* relies on manual parsers for sites that don't have microdata embedded

* doesn't full-render pages by default (Diffbot renders every page, so it can use computer vision to automatically extract the data)

* doesn't support proxies

* doesn't support entity tagging

Probably plenty more, but that's what jumps out to me at first blush.

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Since I see other people have mentioned price as a concern, we're always willing to help out bootstrapped startups. Just shoot me an email: [email protected]

Hard to say and compare in what regard exactly? Price wise, much cheaper. Data wise, it depends. Mainly on in what kind of data you are interested in. Will probably return better results on text-heavy pages, but the data is probably often less "deep". So really depends on the use case. If you have a question to your use case, you can simply write to [email protected] .

At a first look it's much cheaper than Diffbot :)