StoryStretch vs Bookshaper
The closest match on price and audience, and the clearest split on what the AI is allowed to do.
| StoryStretch | Bookshaper | |
|---|---|---|
| Where it runs | In your browser, nothing to install | Desktop app |
| Price | $9.99/mo, one tier, one price | $9.99-$14.99/mo, two tiers |
| Free trial | 14 days | 7 days |
| What the AI does | Checks your work, never writes or rewrites it | Assists and can rewrite prose |
| AI checks included | 1,500 a month, one plan | Credit-based, varies by tier |
The honest version
Bookshaper is built for the same individual novelist StoryStretch is, at the same $9.99/mo entry price, and it also positions itself against AI tools that flatten a writer's voice. Where it differs is what its own AI is allowed to do: Bookshaper's AI can revise the sentences you already wrote.
StoryStretch draws that line in a different place, and holds it. The AI checks whether a passage clears a word-count and structure bar, and it never touches a sentence, not even to tighten one. If you want every word in the finished manuscript to have come from you and nowhere else, that is the whole point.
Who should choose which
If having an AI polish your sentences is what you actually want, StoryStretch will not do that for you, on purpose. If you want a tool that checks your work but never rewrites a word of it, that is exactly what StoryStretch is built to be.