Email Subject Line Checker

Compare your email subject line to 100,000+ others sent by marketers like you. Boost your open rates with data-driven insights.

0/100 characters
B
89 Points
Good subject line with room for minor improvements.
Good
Scannability
✓
9 /10
Excellent scannability! Your subject is easy to read and understand at a glance.
Average:
5/10
Reading Grade
✓
10th Grade
Your subject may be too complex. Try simplifying the language.
Average:
7th Grade
Sentiment
•
-0.100
Neutral sentiment is generally safe for most audiences.
Sentiment Analysis of All Marketing Emails
24% negative
31% neutral
45% positive
Length
✓
56 Characters
8 Words
Great length! Your subject has the ideal character count for most email clients.
Average:
52 characters in 8 words
PREVIEW
Make sure this preview reads well on Desktop and mobile.
📄 Target: 36 characters for desktop; 20 characters for mobile
← →
Email Subject Line Checklist
✓
RE: or FWD: Not Found
Putting a fake RE: or FWD: at the beginning may temporarily boost open rates but is not recommended.
Only 1.07% of emails start with RE: or FWD:
✓
FREE Not Found
Spammers have over-used "Free" in email subject lines, best to avoid it if possible.
Only 2.34% of emails contain the word 'free'.
✓
Spammy Words Not Found
There are words and phrases found more often in spam emails. Best to avoid them if you can.
6.49% contain something likely to get them marked as spam.
!
Bad Tab Words Found
Words like "now" often push your email from Primary to Promotions tab in Gmail.
Replace 'now' in your subject line.
14.21% of emails contain something that may hurt their tab placement.
✓
Exclamation Mark Not Found
Exclamation marks tend to hurt open rates and Gmail tab placement, avoid them.
12.36% of emails are overly excited.
✓
All Caps Words Not Found
Subject lines with all caps words both look like they're shouting and like spam.
9.37% of emails contain an all-caps word.
?
Question in Subject Not Found
Questions are naturally engaging and typically result in higher open rates.
Try rephrasing your subject as a question to increase engagement.
10.48% of email subjects are questions.
✓
Emoji Found
Throwing a few topical emoji into your subject line is an easy way to catch the eye.
Only 2.50% of subjects contain emoji today.
Suggestions to Improve
Made by Gangadhar, With Claude 🤖