🪙 Costs 20 tokens per run

✉️Email Subject Line Tester

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Optimize your subject line with a live score, best‑practice checks, previews, and suggestions.

⚙️Input & Settings
Characters: -Words: -Uppercase: -%Emojis: -
🧮Score
Overall
-
—
    👀Previews
    Mobile (~35 chars)
    Desktop (~60 chars)
    Inbox snippet
    🔎Analysis
    Issues
    Click Recalculate to score.
    Suggestions
    Click Recalculate to get tailored suggestions.
    How this tool works
    1
    Enter subject
    Type your subject and optional preheader.
    2
    Run analysis
    We check length, spam words, casing, and punctuation locally.
    3
    Review score
    See the score, highlights, issues, and suggestions.
    4
    Preview in inbox
    Compare mobile, desktop, and snippet variants.
    5
    Iterate
    Tweak and recalculate to find a stronger variant.