Best in the business for QA

We use Litmus regularly to QA our emails. Whereas some ESPs have email client rendering proofing built within their platform, I've found it typically doesn't compare to the quality and interface of the Litmus renderings. In a few minutes I can check to make sure the email is appearing how it should across all major clients in addition to checking other key sections such as subject line/preheaders as well as links and UTMs.

We don't use this feature within Litmus

Email QA takes considerably less time using Litmus as a QA tool. I can't imagine the hoops I'd have to go through to ensure perfect rendering on dozens of clients without this tool. In addition to client rendering, it has been so easy to check other QA list items such as subject lines and preheaders, links and UTM tags across all of our emails.