Know which headline wins before you spend traffic on it.
Stage
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Founded
2022
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Based in
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Pricing model
Freemium
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Pricing
Free: 4,000 daily credits (approximately 2-3 emails per day), or 30-day Premium trial. Premium: $9.90/month (unlimited emails) or $81.90/year (25% savings).
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
Analyzes incoming emails and generates personalized response suggestions
Adjusts tone based on context and intention
Smart mode requires minimal input from user
Works with Gmail and Outlook
Chrome extension integration
Supports email creation from scratch with context input
Daily credit system for free users
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
Specialized focus on professional email writing rather than generic AI writing
Context-aware and context-specific response generation
Easy-to-use interface designed for professionals
Immediate data deletion for privacy protection
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
Scribbly
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