Does your email look beautiful everywhere?

Litmus lets you preview your campaigns across 40+ real email clients
and devices in minutes. We make email testing easy.

Instant Previews

email testing

Designing emails can be hard. We’ve got you covered. Preview across 40+ email clients and devices in seconds. See how your message looks in the preview pane, and with images on and off.

» See all supported clients

Email clients

  • Apple Mail 8
  • Apple Mail 7
  • Lotus Notes 8.5
  • Lotus Notes 8
  • Lotus Notes 7
  • Thunderbird
  • AOL Mail *
  • Gmail *
  • Google Apps *
  • Yahoo! Mail *
  • Outlook 2016 for Mac
  • Outlook 2013
  • Outlook 2011 for Mac
  • Outlook 2010
  • Outlook 2007
  • Outlook 2003
  • Outlook 2002/XP
  • Outlook 2000
  • *
  • Office 365 *


  • Android 4.4
  • Gmail (Android)
  • iPhone 6 Plus iOS 8
  • iPhone 6 iOS 8
  • iPhone 5s iOS 8
  • iPhone 5s iOS 7
  • iPad Mini iOS 8
  • iPad (retina) iOS 8

* Webmail testing available in IE9, latest versions of Chrome and Firefox (PC).

Try Litmus free

Get started in 30 seconds

No obligation, no sign up fees, no cancellation fees.

Mobile Testing

Preview in mobile devices

See your email on the most popular mobile devices. Litmus even lets you realistically scroll your email on the device.

» Sample report
Interactive Troubleshooting

Make changes and see updates in real time

Get instant previews in 40+ programs and apps as you build your email. Apply and view HTML changes immediately in trouble-prone clients like Outlook, Lotus Notes, and Gmail.

an indispensable toolbox

360 Degree QA

See your email with images on and off

Most email clients block images by default. See how your email will look with images off—will your subscribers be able to read your message and take action?

Color blindness check

Red/green color blindness affects 8% of the male population worldwide. Ensure your designs have enough contrast and the content is readable.

Plain text check

Whether it's for deliverability purposes, a subscriber's preference, or more suitable for a particular email, we also offer plain text previews.

Make a great first impression

Optimize your subject line, preview text, from name, and reply-to address. Is your email convincing enough to get the open?

Try Litmus free

Get started in 30 seconds

No obligation, no sign up fees, no cancellation fees.

trusted by

...along with 100,000 other email marketers,
designers and agencies worldwide.

"Litmus have created an amazing product. It should be part of every marketer’s toolkit."

Dave Greiner Campaign Monitor

"Litmus continues to be an invaluable resource, meeting our expedient & accurate demands within email development."

William Buffo Groupon

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