AI writing assistant that helps detect errors and improve content
Know which headline wins before you spend traffic on it.
Stage
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Founded
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Based in
LT
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Pricing model
Freemium
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Pricing
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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
Generate drafts and rewrite sentences
Grammar and spelling correction
AI pattern detection with sentence-level analysis
Tone adjustment for different audiences
Make AI-generated text sound natural
Fact verification against reliable sources
Upload documents in multiple formats
Plagiarism detection
Text summarization
Word counter and punctuation corrector
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
All writing tools in one workspace without switching applications
Complete writing tasks 3x faster from draft to polished text
Manual review and improvement by professional editors
24/7 live support from real people
Analyzes over 18 billion webpages and private databases for verification
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