None that seem vaguely close to my vision. And one killer feature I would like to focus on (though it's on the roadmap for post-launch) is the ability to notify you if an URL of yours stops being accessible, i.e. you forgot, after a redesign, to set up a redirect from the old URL to the new, which is a nightmare for both users and your SEO.
I've seen that happen countless times, and no service I've tested was able to monitor for that use case satisfactorily and/or at that price point.
In other words, my goal is to create a service to uphold Berners-Lee's "cool URIs don't change" mantra.