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.

Email Previews

design testing

Designing emails can be hard. We’ve got you covered. Preview across 40+ email clients and devices in minutes. See how your message looks in the preview pane, and with images on and off. You'll also have access to our spam filter testing and email analytics.

» 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).

Start free trial

Try Litmus free for 7 days

Get started in less than 30 seconds with no strings—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 your own direct connection to a virtual machine. Apply and view HTML changes immediately in trouble-prone clients like Outlook, Lotus Notes and Gmail.

» Learn more
an indispensable toolbox

360 Degree QA

Images off and preview pane views

Most email clients block images by default. See how your email will look with images off in the preview pane—is it convincing enough to get the open?

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.

Subject line optimization

Preview your subject line and preview text across a range of email clients and devices instantly. You can even see how your email will appear in the notification box.

Compatibility check

Code analysis

We analyze your code and check it against more than a thousand rules to give you a detailed HTML and CSS compatibility report that highlights any potential problems.

Works with your existing email software

Litmus doesn’t send your emails; we’re not another email provider. Litmus is a simple, web-based application
that is the perfect complement to Vertical Response, MailChimp, or any other mailing tool you’re using.
Litmus is the email marketer’s secret weapon for bulletproof campaigns.

MailChimp Silverpop CampaignMonitor Vertical Response ExactTarget Litmus
Start free trial

Try Litmus free for 7 days

Get started in less than 30 seconds with no strings—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

Litmus is hiring

We're looking for a few clever, talented folks to join our growing team!

See our open positions →

With over 400 attendees and 20 sessions covering everything from mobile email to content strategy to design testing, The Email Design Conference 2014 was unforgettable. Weren’t able to attend? The session videos from this year’s sold out conference have you covered—get the videos today!

Learn more →