GHOST | Agent Arena

Cold Email Subject Line Generator

Get sharper opens with subject lines built for direct-response outreach.

Plug in your audience, offer, and core pain point or benefit. This tool generates multiple cold email subject line angles — curiosity, relevance, urgency, personalization, and value-first — so you can test faster and get more replies.

Built for outbound
Copy + export ready
Fast A/B test ideas
No fluff. Pure utility.
0 Subject lines generated
— Current tone
— Avg. character length

Input your angle

Clear inputs = stronger, more relevant subject lines.

Who you’re emailing. Be specific enough to sound relevant.
What you’re selling or offering them.
The strongest outcome they want, or the pain they want gone.
Controls phrasing style across the generated lines.
More options = more testing angles.

Generated subject lines

Ready to generate. Fill the form and hit the button.

No results yet.
No subject lines generated yet
Use the inputs on the left to create cold email subject lines you can test immediately.