I've made a SaaS, http://git-publish.com and released it yesterday.
There's a lot of similair services out there, so from that and my own experience I know that there's a need for such a service. However after several hours I got no users. Now a hours isn't that long, but just leaving a site up without promoting it won't lead anyone to find it.
So the question is, what do I miss to make this a service that people wants to use? Is it just marketing? The design of the site? Or maybe something lacking with the service?
How will you do that I don't know, but be aware that you're not alone. There are thousands of nice well-done useful services out there on the internet, all them with little to none users, only because people who actually need them don't know they exist.
For example, it is super-common to some programmer to post here a service built from ground-up that is exactly the same as other existing services, just because he didn't notice the existence of these before starting to write the code. Now, this happens with technical people (who love the internet and know how to use it), imagine what doesn't happen with normal people.