Server Check.in will never have ads, and the privacy policy (https://servercheck.in/privacy https://servercheck.in/privacy) is pretty clear cut. The revenue com

Server Check.in will never have ads, and the privacy policy (https://servercheck.in/privacy https://servercheck.in/privacy) is pretty clear cut. The revenue comes from the users, so the service is 100% user-focused. I noticed their service when building Server Check.in, but didn't create an account for testing, so can't say anything with 100% certainty. However... - SMS is not free (unless they're using email-to-SMS gateways), so I'm not sure how they're supporting that, unless they have alternative revenue streams. - Database bandwidth/storage for more than a few servers costs money—I've calculated at least a few MB/month/server, meaning the data storage and access is a real cost I have to find money for. Finally, they mention on their about page that they won't do paid until at least Feb. 2013, so I don't know if they'll still be free after that anyways :-/ (This is not to say I don't think their service is bad or anything—I think it looks like a worthy alternative... it's just not what I wanted to use, otherwise, I wouldn't have built Server Check.in.)