Know which headline wins before you spend traffic on it.
Stage
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Based in
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Pricing model
Freemium
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Pricing
Free: 2,500 words per month, all intensities, API access (60 requests/min), document history, no credit card required. Pro: $19/month for 100,000 words per month, 300 requests/min API limit, priority support. Word pack: $9 for 50,000 words with no expiration or subscription.
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
Self-hosted fine-tuned language model
Three intensity levels per request
3-5 second average response time
Content never used for training
Works with any AI model
Webhook support for real-time events
Dashboard with API key management
Document history and web-based interface
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
Rewrites sentence structure and rhythm, not just synonyms
Completely private with no data sharing or third-party APIs
Simple integration with any HTTP client
Generous free plan without credit card requirement
API-first design for programmatic use at scale
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