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Email Subject Line Tester

Score your subject line, catch spam triggers, and preview how it'll look in the inbox before you hit send.

Test

Result

0
/ 100
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Inbox preview
Desktop inbox (Gmail-style row)
Sender Name
Your subject here.Your preheader text will appear here
Now
Mobile inbox . ~35 char subject limit
Sender Name
Your subject here
Your preheader text will appear here
Findings
    What is it?

    What is the Subject Line Tester?

    A tool that scores your email subject line on length, spam triggers, word choice, capitalization, emoji and punctuation use, and shows what it'll look like in a real inbox preview.

    Catch the issues that kill open rates before you hit send.

    Length
    35-50 chars
    Spam risk
    Low
    Score & targeted suggestions
    Tips

    Write Subject Lines That Open

    The little choices add up. Here's what consistently wins inbox attention.

    Here's a quick checklist:

    • Aim for 35-50 characters
    • Avoid ALL CAPS and excessive !!!
    • Skip spammy words like "FREE!!!"
    • Personalize with name or context
    • Use a strong preheader to reinforce
    Benefits

    Why Use a Subject Line Tester?

    • Increase open rates

      Subject lines decide whether your email gets read or deleted.

    • Stay out of spam

      Catch trigger words, ALL CAPS, and punctuation that filters hate.

    • Preview the inbox

      See how your subject + sender + preheader actually look on mobile.

    • Test instantly

      Iterate faster than running A/B tests with no setup needed.

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