Score your email subject line before you send
Get an instant score with tips to improve it. Know if your email will get opened before it hits 1000 inboxes.
30-60 chars is the sweet spot for mobile
Questions and incomplete thoughts drive opens
FREE, URGENT, ACT NOW trigger spam filters
You/Your/Name boosts open rates significantly
Write better emails with the B2B Builder
Generate a full outreach prompt with research, subject line, email body and CTA in one click.
Share on WhatsAppThe Email Subject Line Tester scores your cold email subject line on 7 dimensions — length, spam word risk, curiosity factor, personalisation level, clarity, mobile preview optimisation, and India-specific relevance. Get an instant score out of 100 with specific improvements to increase your open rate.
Type or paste the subject line you want to test.
Your product and target buyer — helps calibrate the score for your specific audience.
Get a score out of 100 broken down by each dimension.
Each low-scoring dimension comes with a specific rewrite suggestion.
SDRs and salespeople sending cold outbound emails, marketing teams running email campaigns, and anyone who wants to improve their cold email open rates before hitting send.
The average cold email open rate in India is 15–25%. The top performers get 40–60%. The difference is almost entirely in the subject line — it's the only thing the recipient sees before deciding to open or ignore. Testing and optimising subject lines before sending is the fastest way to double your open rates.
What makes a subject line fail in Indian inboxes?
Too long (over 50 characters), spam trigger words (Free, Guaranteed, Act Now), generic phrases (Quick question, Following up), and no personalisation. Also, subject lines that look like marketing emails rather than personal outreach.
Does mobile optimisation matter?
Yes — over 80% of Indian professionals read email on mobile. Subject lines over 40 characters get cut off. The first 6-8 words matter most.
What score should I aim for?
70+ is good, 80+ is excellent. Don't send a subject line scoring below 60 without revising it first.
Can I test multiple variations?
Yes — test 3-5 variations and use the highest-scoring one. Even a 5-point improvement in score typically translates to a measurable increase in open rate.