Generate 7 subject line variations with psychological hooks that maximise open rates.
Use tool7 variations per run
Get multiple subject lines using different angles — curiosity, urgency, personalisation, and more.
Psychology-backed hooks
Each variation uses a different cognitive trigger: curiosity, social proof, urgency, or specificity.
Under 1 minute
Describe your email and get subject lines instantly. No copywriting experience needed.
Works for any email type
Cold outreach, newsletters, product launches, follow-ups, job applications — all covered.
What type of email it is, who's receiving it, and what you want them to do after opening it.
The main benefit, offer, or news you want the subject line to communicate.
Each variation uses a different psychological angle so you can test which resonates best with your audience.
Cold outreach campaigns
Stop your email being ignored with a subject line that earns a first click.
Newsletter senders
Improve open rates week after week by testing different subject line styles and hooks.
Product marketers
Announce launches, promotions, and updates in a way that compels action.
Job applicants
Stand out in a recruiter's inbox with a subject line that gets your application opened.
Specificity, curiosity, and relevance. The best subject lines make the reader feel the email is written for them specifically and create just enough intrigue to click.
40–60 characters is the sweet spot for most email clients. Mobile previews cut off longer lines, so front-load the most important words.
Emojis can boost open rates in B2C and newsletter contexts. For cold outreach or B2B, plain text often performs better because it looks more personal and less like a broadcast.
A/B test — send each variation to a smaller segment of your list first, then send the winner to the rest. Most email platforms have this built in.
Yes. Generate subject lines for your initial email and use the tool again to write follow-up subject lines with a different angle.
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