Subject Line
0 characters
Results
Score
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Length
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Spam Flags
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Emojis / !
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Suggestions
Variants (A/B ideas)
Inbox Preview
Tips
Ideal Length
Aim for ~28–50 characters. Shorter is punchier; longer risks truncation.
Be Specific
Use clear benefits, numbers, or deadlines. Avoid vague hype.
Risky Language
Limit spammy phrases (“act now”, “free $$$”, “congratulations”), multiple exclamations, and ALL CAPS.
Personalization
Tokens like {first_name} or using the reader’s role can help—don’t overdo it.