Kosmos
Kosmos: A research-led nonfiction workflow for planning, organizing, and reviewing book projects. Ranked #26 of 27 in AI Book Writing Software by our editors (6.4/10); pricing: Free; best for research-led nonfiction planning.
At a glance
- Editor score6.4 / 10
- PricingFree
- Best forResearch-led nonfiction planning
- Free planNo
- Paid fromFree
- Book outliningYes
- Facts checked21 Sep 2026
Where it wins
- Organizes research into tagged entries and tracks coverage gaps
- Proposes outlines and maps chapter briefs to supporting evidence
- Reviews drafts against an eight-point consistency checklist
Where it doesn't
- Requires the user's own Claude subscription
- Does not provide rewrite controls or verified drafting
- Currently in beta and focused on Markdown-based workflows
Our verdict on Kosmos
Kosmos is an AI-assisted methodology for producing nonfiction books inside Claude Code. It supports the early and middle stages of a book project: developing a concept, organizing research, identifying coverage gaps, proposing an outline, preparing chapter briefs, and reviewing a draft. The author remains responsible for writing the prose and making editorial decisions, making Kosmos a fit for writers who want structured research-led planning rather than an automated manuscript generator.
Kosmos is free during its beta period, but it requires the user's own Claude subscription. Its workflow uses Markdown files and works with Obsidian or any Markdown editor, with Markdown listed as the export format. That gives it a clear fit for writers who already organize projects in plain text or want their book materials to remain portable. The published integrations are Claude Code and Obsidian, so buyers looking for a broader application ecosystem should consider whether this focused setup matches their workflow.
The standout capability is the connection between research coverage, outline development, chapter briefs, and draft review. Kosmos can organize evidence, surface identified gaps through web-based research, map material to chapters, and check drafts for progress and consistency. It also includes book concept development, outline refinement, and continuity tools. The trade-off is scope: the author writes the prose, and rewrite controls are not included. Kosmos should suit nonfiction authors who need a disciplined planning and evidence-tracking process; writers seeking automated drafting or rewriting should choose a different tool.
Your product? Our editors can test Kosmos in depth and publish a review, labelled as paid · from $149/mo →
Kosmos pricing
Kosmos fact sheet
| Free plan | No |
|---|---|
| Paid from | Free |
| Maximum words | Not verified |
| Book outlining | Yes |
| Chapter workspace | Yes |
| Continuity tools | Yes |
| Rewrite controls | No |
| Export formats | Markdown |
| Built for | Solo, Small business (editorial estimate) |
| Integrations | 2 integrations: Claude Code, Obsidian |
| Pricing | Free |
| Website | kosmos.page |
| Facts checked | 21 Sep 2026 |
Kosmos integrations
Kosmos lists 2 integrations on its own site.
- Claude Code
- Obsidian
Alternatives to Kosmos
- BookwizA web-based workspace that takes authors from outline to KDP-ready files.9.4
- PendraicPendraic gives series authors detailed planning, continuity control, and flexible AI support.9.2
- FireQuillA deep AI writing workspace for authors who need validation, continuity, and flexible exports.9.1
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The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used Kosmos for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.
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Featured on iTechGuides
Kosmos is listed in our AI Book Writing Software directory. Add the badge to your site — it links back to this page.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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