How to use this tool
Paste a subject line and run the check. Use the feedback to make the message clear, specific, and consistent with the email body. Character limits here are editorial prompts; inbox display widths vary by device and client.
Can this predict deliverability?
No. It does not inspect sender reputation, authentication, recipient engagement, or email content. It cannot predict spam placement or open rates.
More help for your workflow
Explore the newsletter guides or try another free email tool.