Astro is by Austin Software! It's a productized version of what we do.
People kept thinking that Austin Software was a product outsourcing firm, i.e. they kept asking us for quotes or rate cards, etc. So to avoid confusion we built Astro, which is a UX over our team building infrastructure.
This was not the main reason though, I mentioned that as an well appreciated side-effect. The fact that Fastmail was a well known provider with a ton of flexibility, and a fast client helped a lot.
