I want the logo to reflect that this is a modern, reliable service but also that this is a small company, so there's room to be more personable than a big faceless enterprise.
Clean, clear, modern designs are preferred over gritty, grunge, or skeuomorphic designs.
Primarily it should be easy to use the logo on a website, secondarily it should be possible to use it in a square app icon on phones. The logo should be useable on both dark and light backgrounds.
DESIGNS I LIKE (see attachments):
* Airplane: I like the clever use of the biplane/A letter
* Captify: I like the ‘ap’/infinity symbol detail
* Cosmos: the simple planet detail
* Okafor & Weinstock: the logomark/monogram is very cool
I like the idea of a logotype, possibly combined with a simple logomark or monogram type design.
THINGS TO AVOID:
Locks, keys, and shields are all overused symbols when it comes to website security, please don't use them in your submissions.
If you're unfamiliar with them, SSL certificates are essentially what make a site show up with a lock icon in Firefox, Chrome, and other browsers.