AI studio and reader for books, comics, and printables with optional cloud sync and AI audiobooks
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
$9 per book, $9.99 per comic, $5 per printables set, $9 per blog post. Writing and reading are free; prices apply only to download files.
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
AI-powered writing in 26 formats across 48 languages
Interview-based planning and chapter writing
Bite-sized card reading view for focus
Bionic Reading to improve reading speed
RSS and Atom feed integration
Offline reading with no ads
Optional free cloud sync across devices
AI audiobooks with word-by-word highlighting
Export highlights and notes as Markdown
Multiple output formats including EPUB and PDF
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
Finished, publishable files not drafts in one studio session
All output is real—no mockups shown
Line-edited writing that reads like a human wrote it
No credits or subscriptions needed to write
AI disclosure and copyright flexibility for Amazon publishing
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