title: IdentityServer3 vs Azure Active Directory vs AWS Directory Services
body: <p>I'm evaluating the above three identity management technologies and wanted to try to find out the advantages/disadvantages and get a sense for when I should be using IdentityServer3 over the other technologies. I have three scenarios:</p>
  
  <ul>
  <li>Internal MVC Client to Web API</li>
  <li>External Phone Client to Web API</li>
  <li>Internal Web API to Web API</li>
  </ul>