Build emails that work everywhere
Find email-client compatibility, HTML standards, and accessibility issues before your campaign reaches the inbox.
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Compatibility checks in every analysis
Every pre-send and live analysis includes compatibility checks that scan your email HTML and CSS. See the affected code and identify the common email clients that may be impacted before you send.
Know what each client supports
Spot unsupported features, mixed support, and partial support across common email clients. Focus your fixes on the code most likely to change how subscribers see your message.
Improve quality and accessibility
W3C and WCAG checks surface HTML validation and accessibility issues, including missing alternative text, with recommended corrections where problems are found.
Paste, edit, and check instantly
Open the Compatibility Check tool to paste or edit email HTML directly and receive instant feedback as you build. Use it with Client Previews before sending or after a major code change for a complete email QA workflow.
