Subject line options testing curiosity, benefit, and urgency.
Quick inputs
Prompt preview
Write 12 email subject lines for [your topic]. Tone: professional. Mix curiosity, benefit, social proof, and urgency. Keep each under 50 characters and label the angle.
Apply updates the chat composer below. You can still edit the message before sending — same orchestration as blank chat.
Edit the starter prompt if you want, then send. Full chat tools stay available.
Melsun is AI and can make mistakes. Check important info.
Open rates live or die in the inbox. Generate a labeled set of short subject lines so you can A/B test what earns the click.