The Problem
47% OF EMAILS
ARE NEVER
OPENED.
The subject line is the single biggest lever in email marketing. Yet most marketers spend 5 minutes on it, write something generic, and wonder why their open rates are stuck at 18%.
Hiring a copywriter costs $50–$200 per email. Generic AI chatbots produce bland, untested output. SubjectAI Pro is the specialized tool that bridges the gap — at a price you pay once.
Features
THREE TOOLS.
ONE LIFETIME PRICE.
Subject Line Generator
Enter your email topic, target audience, and tone. Get 10 AI-optimized subject line variants with open-rate scores and explanations. Powered by GPT-4.1.
Subject Line Rewriter
Paste your existing subject line. Get 5 improved versions with specific changes highlighted — power words added, length optimized, personalization tokens suggested.
Cold Outreach Builder
Input a prospect's name, company, and your value proposition. Get a complete cold email — subject line, hook, body, and CTA — ready to send in seconds.
How It Works
FROM BLANK PAGE
TO SENT EMAIL
IN 60 SECONDS.
Enter Your Details
Tell the AI your email topic, who you're writing to, and the tone you want. Takes 30 seconds.
AI Generates Options
GPT-4.1 generates 10 optimized subject lines with open-rate scores and detailed explanations for each.
Copy & Deploy
Pick your favorite, copy it with one click, and paste it into your email platform. Done.
Social Proof
REAL RESULTS.
REAL PEOPLE.
"My open rates went from 19% to 34% in the first week. I use SubjectAI Pro for every single campaign now."
Sarah K.
Email Marketer, SaaS Startup
"The cold outreach builder alone is worth the lifetime price. I booked 3 calls in the first day of using it."
Marcus T.
B2B Sales Rep
"I was skeptical about another AI writing tool, but the subject line scoring and explanations are genuinely useful. Not just generic output."
Priya M.
Newsletter Creator, 12K subscribers
"Paid $49 once and I've used it 200+ times. The math is insane compared to any subscription tool."
Jake R.
Freelance Copywriter
Pricing
PAY ONCE.
OWN IT FOREVER.
No monthly fees. No usage caps that reset and charge you more. One payment, lifetime access.
Starter
Perfect for solopreneurs and freelancers
- Unlimited subject line generation
- Unlimited subject line rewrites
- 10 cold outreach emails/day
- All 6 tone modes
- Open-rate scoring
- Copy to clipboard
- Lifetime access
Pro
For marketers and growing teams
- Everything in Starter
- Unlimited cold outreach emails
- A/B test mode (2 variants)
- Spam score checker
- Priority AI model (GPT-4.1)
- Lifetime access
Agency
For agencies and power users
- Everything in Pro
- 5 team seats
- Bulk generation (up to 50 at once)
- CSV export
- White-label output
- Priority support
- Lifetime access
FAQ