100/100
- Length: 49 characters (aim for 15 to 50 so it fits on a phone).
- Word count: 6 words (2 to 8 reads like a person wrote it).
- Spam-trigger words: None found.
- All-caps words: None found.
- Exclamation marks: None found.
- No fake Re:/Fwd:: Good.
- Emoji: None found.
- Personal or relevant: Mention their company, city or a {{token}} so it reads as written for them.
How to use the cold email subject line tester
- Type or paste your subject line; the score updates as you type.
- Fix anything marked with an exclamation mark.
- Aim for 80 or more, then test two versions in a small send and keep the one with more replies.
What the score means
The score is a checklist, not a prediction: each passed check adds points. 80 or more means the subject line avoids the common signs of mass marketing. Reply rate still depends most on whether the email is relevant to the person reading it.
How to write subject lines contractors open
Short, specific and about them works best: their company, their city or one thing you noticed. Avoid hype words and capitals, and never fake a reply with Re: on a first email. Our guide to cold email subject lines for contractors has examples by trade.
- Quick question about {{company}}'s Google reviews
- Roof repair searches in {{city}}
- Idea for {{company}}'s storm season
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FAQ
- How long should a cold email subject line be?
- Between about 15 and 50 characters. Most people read email on a phone, where longer subject lines are cut off, and short lines look more like a message from a person than a campaign.
- Do spam words really hurt deliverability?
- Modern filters rely mostly on sender reputation and engagement, but hype words like free, guarantee and act now still make an email look like marketing to the reader, which lowers replies and raises spam reports. Removing them costs nothing.
- Is it OK to start a cold email subject with Re:?
- No. A Re: or Fwd: on a first email implies an earlier conversation that never happened. It misleads the reader and can breach the CAN-SPAM rule against deceptive subject lines.
