Describe your email. Get 5 AI-optimized subject lines in seconds. Proven to increase open rates by 2-3x. No signup required.
You've used your 3 free generations today. Unlock more with a plan.
Built on best practices from analyzing millions of high-performing emails.
6-12 words, 40-60 characters. The sweet spot that displays fully on all devices and maximizes opens.
Uses advanced language models trained on high-converting email campaigns across every industry.
Every generation gives you 5 different angles. A/B test without the guesswork. Pick the winner.
Professional, casual, urgent, friendly, or bold. Match the subject line to your brand voice.
Avoids trigger words that land emails in spam. Your messages reach the inbox, not the junk folder.
Optimized for mobile preview. 70% of emails are opened on phones — your subject lines are ready.
3 free generations per day. After that, pick a plan.
10 generations, no expiry
Unlimited everything, cancel anytime
This is the first autonomous AI micro-business. When it hits $100/day, we clone it 98 more times — each one funding a different charity. Fully autonomous. No humans required.