Open or delete?
Test your subject line before you send. See who opens.
AI simulation only. Not a survey of real people.
Why A/B test subject lines?
Your subject line determines if your email gets opened
Maximize open rates
The best email in the world is useless if no one opens it. Test subject lines to boost opens.
Audience diversity
Your subscribers span ages, backgrounds, and perspectives. See how each segment reacts.
Faster than real A/B
Get insights in 8 minutes instead of splitting your list and waiting for results.
Test full content too
Beyond subject lines—test your full email body or newsletter intro content.
How email subject line testing works
Three simple steps to better open rates
Paste your subject lines
Enter 2 or 3 subject line variations you're deciding between. Or test full email content.
We poll 500 simulated Americans
Each persona has unique demographics and worldviews. They react as if seeing it in their inbox.
Get your report
See positive/negative/neutral splits by age, education, political leaning, and more.
Simple pricing for email testing
No subscriptions. Pay per test.
Free Preview
See how it works with a smaller sample
- 100 AI persona reactions
- Sex, Age & Urban/Rural breakdowns
- 2 sample audience quotes
- Full demographics in paid
- Results expire in 24h
Up to 3 free tests per week
A/B Test
Compare 2 message variants
- 500 reactions per variant
- Full demographic breakdowns
- 6 sample audience reactions
- CSV export
- 30-day access
A/B/C Test
Test 3 message variants
- 500 reactions per variant
- Full demographic breakdowns
- 6 sample audience reactions
- CSV export
- 30-day access
Test your subject lines now
Results delivered to your email in about 8 minutes.
Email Subject Line Testing FAQ
Can I test just subject lines or full emails?
Both! For subject lines, just paste them. For full email content, paste your entire intro or body text. simulated audience evaluate whatever you provide.
Is this better than A/B testing my actual list?
It's complementary. SimAudience gives you fast pre-send insights so you don't waste half your list on a losing subject line. Use both for maximum optimization.
What demographics are included?
Each AI persona includes age (18-29, 30-44, 45-59, 60+), education level, political leaning, US region, and urban/rural classification.
How do I interpret the results?
Higher positive percentages mean more simulated audience reacted favorably. Pay attention to segment differences—a subject line might work great for 30-44 year olds but fall flat with 60+.
Is my email content kept private?
Yes. Your content is only used for testing and is deleted after 30 days. We never share or publish your content.
Can I test promotional vs. informational subject lines?
Absolutely. Test any angle—curiosity, urgency, personalization, questions, benefits, emojis vs. no emojis. The simulated audience react authentically to each approach.
Important: SimAudience uses simulated audience modeled on demographic data. This is a synthetic simulation, not a survey of real email subscribers. Results should be used for directional guidance only.
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A/B test any message, on any platform, with AI-powered audience simulation.