Hoefler & Co. launched its Cloud Typography service publicly in 2013 after a lengthy (and much coveted) beta period, and it was worth the wait. It’s one of the most “tunable” services with regard to including only what you want, and the quality is really out‐ standing. It’s one of the only services to work with just its own creations, but given the demand for its typefaces and how reasonable the pricing is, that seems to be just fine. Not surprisingly, it also supports OpenType features in its typefaces, with some of the most extensive and fine-grained controls over exactly which features you want to enable. This gives you a bit more control over the size of the eventual download. Some good documentation is available from their user guide.