Email subject lines that get opened.
Generate 10 high-converting subject lines for cold outreach, newsletters, follow-ups, and more — in under five seconds.
Generating 10 subject lines…
Use-case guides
Hand-curated subject lines, frameworks, and the generator pre-tuned for each use case.
Why subject lines decide everything
About 35% of email recipients decide whether to open based on the subject line alone, and another 22% on the preheader. That means more than half the open-rate game is won before the body of your email is even seen. A great subject line is short, specific, and pattern-breaking — it tells the reader "this is worth eleven seconds of your time, and it sounds like something a human wrote." That's exactly what this tool optimizes for.
Behind the scenes, every generation runs through a system prompt tuned on the patterns that consistently win in cold outreach, newsletters, and lifecycle campaigns: curiosity gaps that don't feel cheap, specificity that beats vague benefit claims, and a strict spam-trigger filter so your emails stay out of the promotions tab.
FAQ
Is this really free? +
Yes. Five generations per day with no signup. We pay for the API; you don't.
Which AI model powers this? +
Llama 3.3 70B served via Groq's LPU inference — fast, free for you, and excellent at short-form copy.
How long should an email subject line be? +
Aim for 30–50 characters. Mobile clients cut around 40 characters on the inbox preview, so the front-loaded promise should fit there.
Will my data be stored? +
No. We don't log topics. The only thing stored is a per-IP daily counter for rate limiting.