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
Free trial
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Pricing
$39 a month (launch price for first 100 seats), then $59, then $79. Team plan: $149 a month for 5 people, $29 per extra person. 7-day free trial with card required.
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
Voice profile learned from your own posts
Interview-based fact gathering
Six editorial checks before publishing
Typeset cards and carousels
Story Bank for facts and stories
Commenter sorting by buyer type
Approval queue for posts, replies and comments
Integration with Claude, ChatGPT and Cursor
Weekly review vs your usual posts
Chrome extension
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
Drafts in your established voice instead of sounding generated
Requires human approval for every post before publishing
Facts checked and traced to sources or your Story Bank
Learns from your own posts, not generic templates
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
Kalamos
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