AI-powered email writing tool that generates emails, subject lines and messages in seconds
Know which headline wins before you spend traffic on it.
Stage
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Founded
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Based in
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Pricing model
Freemium
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Pricing
Free plan with daily limits; Premium plan available with additional features like expand function
Free: $0/month with 5 rankings and 60 Claude-written options monthly. Creator: $19/month with 100 rankings and 2,500 options. Pro: $49/month with 600 rankings and 6,000 options. Agency: $149/month with 3,000 rankings and 20,000 options.
Key features
Multi-language support for 17 languages
12 different tonal options for customization
Three length choices: short, medium, long
User-friendly interface with quick navigation
AI-powered suggestions for content improvement
Real-time editing and customization
Chrome browser extension integration
Mobile device compatibility
No login required for basic usage
Generate emails for various purposes and use cases
Head-to-head comparison of up to 200 variants
Bradley-Terry model ranking with calibrated odds
Honest uncertainty verdicts: Clear, Lean, Too close to call
Brand profiles to calibrate accuracy on your audience
Works for YouTube titles, subject lines, ad headlines, and article headlines
Accuracy measured on 9,841 held-out A/B tests
What makes it different
Completely free tool with no financial investment required
Customization with tone, length, and language options
Does not use user content to train the service
Generates human-like, on-brand emails in seconds
Security and privacy prioritized in all operations
82% accuracy on clear calls, trained on thousands of real A/B tests never seen during tuning
Honest about uncertainty instead of always crowning a winner
56 times cheaper than Claude Sonnet while maintaining comparable accuracy
Custom calibration to your audience's behavior via brand profiles
Compare versions in both orders to cancel out model bias
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