Free tool · Write better emails
Your subject line decides if they open. Test it first.
Type your subject line and see how it looks in the inbox, what holds it back and what to change. Built for cold email, where a short, plain subject wins.
- 100% free
- No sign-up
- Your text stays in your browser
Your result shows here.
Type a subject line and press Test my subject line, or try our example.
You've used today's 100 free tests.
Come back tomorrow for more. Want us to write emails that get opened? Book a call below.
What works
What to change
How it looks in the inbox
Cut-off points are approximate. Every inbox app is a little different.
Desktop
Phone
Checked the subject? Now check the whole email. Our free Spam word checker marks the risky words in your email and suggests safer ones.
Check my emailHow it works
Simple, in 3 steps.
- 01
Type your subject line
Add the first line of your email too if you have it. Inboxes show it next to the subject.
- 02
See it in the inbox
Check how it looks on desktop and phone, and where it gets cut off.
- 03
Fix and compare
Change what holds it back, or test two versions side by side.
Questions
Straight answers.
Is it free?
Yes. No sign-up, and 100 free tests a day.
Do you see my subject line?
No. The test runs in your browser and nothing is sent to us.
What makes a good cold email subject line?
Short, plain and about them. A few words, no capitals or exclamation marks, nothing that sounds like an ad.
Can you promise more opens?
No tool can. Opens also depend on your sender name, your domain setup and who you write to. This tool removes what holds a subject back.
Can VENOVIQ write our cold emails?
Yes. We write, test and send cold email for B2B teams. Book a call and tell us who you want to reach.
Keep going
More free tools
- Free · LiveSpam word checkerFind the words that can push your email into spam.Open tool
- Free · LiveAI cold email writerGet a short, clear first draft of a cold email.Open tool
- Coming soonCold Email X-RaySee what is weak in your cold email and how to fix it.
Every slow reply is a chance for someone else to win the client.
Let's make sure the next one is yours.
Tell us what you need and we'll send you a clear quote.