Writing
Your subject line is the only thing standing between your email and the trash. Describe your email and get subject lines that earn the open.
AI-generated output
Describe your email above and click Generate to get your subject lines.
Describe the purpose of your email and the key message or offer you want to communicate. The more specific you are about what the reader will get by opening, the sharper the subject lines.
Select the tone that fits your brand and audience. A sales email to cold prospects needs a different approach than a newsletter to existing customers or an internal announcement.
You get a primary subject line, an A/B testing variant with a different psychological angle, preview text that complements the subject, and a note on which psychological trigger each line uses.
For example, a SaaS company emailing trial users who have not upgraded might get: "Your free trial ends in 48 hours" (urgency angle) as the primary line, "3 features you haven't tried yet" (curiosity angle) as the A/B variant, and preview text like "See what you'd be leaving behind — and what it costs to stay."
The psychological note might flag that the urgency variant performs better with price-sensitive segments, while the curiosity variant tends to outperform with high-intent users who need a reason to act rather than a deadline.
Between 30 and 50 characters is the sweet spot for most email clients — long enough to communicate something specific, short enough not to be truncated on mobile. The generated subject lines aim for this range, but slightly longer lines can work well when the extra words add genuine intrigue or specificity.
Preview text (also called preheader text) is the snippet of text that appears next to or below the subject line in most email clients. If you do not set it explicitly, email clients pull the first line of your email body — which is often an unsubscribe link or a header image description. Setting deliberate preview text doubles the real estate you have to sell the open.
Send the primary line to 40% of your list, the variant to another 40%, and hold 20% in reserve for the winner. Let the test run for at least 4 hours (longer for smaller lists) before declaring a winner. Most email platforms (Mailchimp, Klaviyo, HubSpot) have built-in A/B testing that handles this automatically.
Subject lines that use curiosity or urgency can feel manipulative if the email body does not deliver on the promise. The generator is designed to produce lines that match your stated key message — not generic "open-bait". If your email genuinely offers value, a well-crafted curiosity hook is not clickbait; it is good copywriting.
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