Dark Mode in Marketo Engage: What to Expect and How to Plan for It

Dark mode has become a normal part of the email experience, which means marketers need to think about more than just how an email looks in the default inbox view.

The tricky part is that dark mode does not behave the same way across email clients. Some inboxes support custom dark mode styling, some apply their own automatic treatment, and some ignore custom settings altogether. That can make testing feel inconsistent unless you know what to expect.

With the new Email Designer in Marketo Engage, you can now do more to prepare for dark mode. Marketo lets you:

• preview dark mode behavior
• define custom dark mode styling for supported clients
• adjust text, background, and button colors
• swap in alternate assets when needed
• test rendering across clients with Litmus integration

That said, it’s important to set expectations correctly: Marketo Engage cannot control how every email client ultimately renders your message.

Once the email reaches the inbox, the email client still has the final say. That’s why the same email may look different in Gmail, Apple Mail, and Outlook, and it sometimes even differs between desktop and mobile versions of the same client.

A good dark mode strategy in Marketo Engage is less about chasing perfect consistency and more about building emails that stay:

• readable
• on-brand
• visually clear
• resilient across major inbox environments

A few practical recommendations:

1. Design for contrast first
   Make sure text remains easy to read against both light and dark backgrounds.
2. Review logos and image assets carefully
   Images do not always behave like text and background colors. A logo that works well in light mode may disappear or lose impact in dark mode.
3. Test in the email clients your audience actually uses
   Focus on the inboxes that matter most to your recipients instead of trying to optimize equally for every possible client.
4. Expect variation
   Dark mode in email is not a fully controlled environment. Small differences between clients are normal.

The good news is that Marketo Engage now gives marketers a much better way to preview, style, and test for dark mode than before. The key is using those tools with realistic expectations.

Bottom line: dark mode is worth planning for in Marketo Engage, but success comes from thoughtful design and testing, not from assuming every inbox will behave the same way.

Has anyone here found a dark mode testing workflow in Marketo that works especially well for their team? I’d be interested to hear how others are approaching logos, buttons, and image handling.