The gray line after the subject. Optional.
How it reads on a phone, among other mail.
Fern & Flour
9:41Sam, your 20% off code ends tonight
Use it on anything in the shop, including new spring candles.
Subject line score
95/100
Strong. Test it against one other version.
Inbox preview
Small phone · about 35 characters
Fern & Flour
Sam, your 20% off code ends tonight
Use it on anything in the shop, inc…
Most phones · about 45 characters
Fern & Flour
Sam, your 20% off code ends tonight
Use it on anything in the shop, including new…
Desktop · about 70 characters
Fern & Flour
Sam, your 20% off code ends tonight
Use it on anything in the shop, including new spring candles.
Good length (44 characters). Most phones show it in full.
No common spam-trigger words.
Uses a personalization token. Check it has a fallback for contacts with no name.
Has a number. Specifics (3 tips, 20% off) tend to get attention.
This is a rule-of-thumb score, not a prediction. Your list, sender name and timing matter more than any single word, so A/B test two subject lines when your email tool allows it.
Free Email Subject Line Tester by Hiyaly