Litmus generates preview screenshots of your emails across 50+ apps and devices to ensure compatibility in all environments. Their service also test against popular mail filters to indicate if the content you’re sending is likely to get filtered before hitting the inbox.


  • 50+ previews in popular email apps and mobile devices
  • Views for images on and images off
  • Extensive range of mail filter tests
  • Merge user data into Litmus tests for more realistic results