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First Book AI vs Sudowrite

Two fact sheets from our own research, side by side — pricing, platforms, API access and status re-checked by us rather than quoted from the vendors. First Book AI starts at $29, Sudowrite at $10. Only First Book AI has a free tier.

First Book AIAI co-writing tool that turns a professional's expertise into a nonfiction book outline and chapters.SudowriteLong-form fiction drafting with a story bible attached

Side by side

FactFirst Book AISudowrite
CategoryAI Writing AssistantsStorytelling & Fiction
Pricing modelFreemiumPaid
Starts at$29 one_time$10 month
Public APINoNo
PlatformsWebWeb
CompanyFirst Book AISudowrite
Launched—2020
Last verifiedSep 1, 2026Sep 6, 2026

What our research says

First Book AI

First Book AI is useful for someone with real expertise who wants a structured first draft fast rather than a blank page. The free outline is a low-risk way to see if the structure fits before paying, but the writing still needs a human edit pass to sound less templated.

Pros

  • Free outline before any payment is required
  • Credits never expire, so there is no subscription to forget about
  • Exports to Word, EPUB, Markdown, and PDF for further editing

Cons

  • Only handles nonfiction, not fiction
  • No named company or team on the site, which makes support channels unclear
  • Chapter text still needs a real editing pass before publication

Sudowrite

The only writing tool built around a novel rather than a document, and the story bible is why people stay — but you are renting credits, and the cheap tier runs dry mid-chapter.

Pros

  • Story bible holds characters and plot consistent across a full manuscript
  • Muse is tuned for narrative rather than general-purpose output
  • Max rolls unused credits forward for twelve months
  • Trial needs no credit card

Cons

  • No free tier — when credits stop, the manuscript stops
  • 225,000 credits on the $10 plan is thin for a full-length draft
  • Rollover exists only on the $44 Max plan
  • Web-only, with no offline or desktop editor

Which one fits

Choose First Book AI if you need

  • Consultants and coaches turning talks or frameworks into a book
  • Founders who want a lead-generating book without hiring a ghostwriter
  • Writers who work better editing a draft than starting from nothing

Choose Sudowrite if you need

  • Novelists drafting long fiction who need continuity across many chapters
  • Writers who want targeted moves — expand, describe, rewrite — instead of a chat window
  • Anyone comparing a fiction-tuned model against general-purpose assistants

More comparisons

Browse all AI Writing Assistants →