PhoneFactor

PhoneFactor, now Windows Azure Multi-Factor Authentication, provides secure authentication for on-premise, cloud and hybrid applications. The job it does: running websites, apps and data on servers you do not have to maintain.

It makes the most sense for developers and businesses of every size. They also list Cloud Computing, so expect those to show up in the feature set. As a small product team themselves (11 to 50 people), they tend to serve customers of a similar scale best. You will probably talk to the people who build it, which is great until you need 24/7 support.

PhoneFactor is based in Overland Park, Kansas. More on phonefactor.com.

Our checklist for this category: pricing predictability, support quality, and migration help. Get the renewal terms in writing before the first invoice.

The facts above come from public company records. The score will come from people like you. Used PhoneFactor? Rate it.