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Kosmos

kosmos.page

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Spec score 8.0 #16 of 27 in AI Book Writing Software

What it is

Kosmos is a nonfiction book-production method that runs inside Claude Code, organizing work through ideation, research, structure and writing. Its AI helps sort research into tagged entries, track coverage across themes and point out gaps; when web access is available, it can search for material to address them. It can advise on structure, then review drafts against an eight-point checklist, track progress and check consistency. The AI does not write manuscript prose. Kosmos includes book outlining, a chapter workspace and continuity tools, but no rewrite controls. Projects are Markdown files that work as Obsidian vaults. Obsidian is recommended, though any Markdown editor works, and the maker says users keep their files if they stop using Kosmos. The beta is free, but users must supply Claude Code and a Claude Pro or Max subscription. During beta, every signup is manually reviewed and approved. Maker Joakim Achren says he has self-published nonfiction books and is seeking authors willing to try the method and offer feedback.

Spec sheet

Purpose
Kosmos is a structured methodology for producing nonfiction books that runs inside Claude Code.Read 9 Oct 2026 · kosmos.page
Intended users
The maker is seeking authors interested in a structured approach to book production who are willing to provide feedback.Read 9 Oct 2026 · kosmos.page
Integrations
Kosmos runs inside Claude Code; Obsidian is recommended, and any Markdown editor can be used.Read 9 Oct 2026 · kosmos.page
Support
The maker asks beta users to share feedback about what works and what does not.Read 9 Oct 2026 · kosmos.page
Maker
The maker identifies himself as Joakim Achren and says he has self-published nonfiction books.Read 8 Oct 2026 · kosmos.page
Access
During beta, the maker manually reviews and approves every signup.Read 8 Oct 2026 · kosmos.page
AI role
AI organizes research, tracks coverage gaps, advises on structure, and reviews drafts; it does not write manuscript prose.Read 9 Oct 2026 · kosmos.page
Beta access
During the beta, the maker manually reviews and approves account access.Read 9 Oct 2026 · kosmos.page
Beta status
Kosmos is described as an early beta, and the maker says the tooling is new and feedback is welcome.Read 8 Oct 2026 · kosmos.page
Draft review
AI reviews drafts against an 8-point checklist and checks for consistency.Read 9 Oct 2026 · kosmos.page
Editor compatibility
Obsidian is recommended, and the maker says any Markdown editor works.Read 8 Oct 2026 · kosmos.page
File format
Project files are Markdown and work as an Obsidian vault; the maker says users keep their files if they stop using Kosmos.Read 9 Oct 2026 · kosmos.page
Prerequisite
Kosmos requires Claude Code and a Claude Pro or Max subscription, which users provide themselves.Read 8 Oct 2026 · kosmos.page
Process
Its four phases are ideation, research, structure, and writing.Read 8 Oct 2026 · kosmos.page
Requirements
The maker says Claude Code requires a Claude Pro or Max subscription.Read 9 Oct 2026 · kosmos.page
Research
Kosmos organizes research into atomic tagged entries, tracks theme coverage, and identifies gaps for further research.Read 8 Oct 2026 · kosmos.page
Research organization
Kosmos organizes research into atomic, tagged entries and tracks coverage across themes.Read 9 Oct 2026 · kosmos.page
Setup
Claude Code handles installation of the kosmos-cli, authentication, and project setup.Read 9 Oct 2026 · kosmos.page
Web research
Kosmos can search for material to fill research gaps when web access is available.Read 9 Oct 2026 · kosmos.page
Workflow
The process has four phases: ideation, research, structure, and writing.Read 9 Oct 2026 · kosmos.page

Plans and prices

Beta Free Free during beta · requires your own Claude subscription · access approved manually Read 9 Oct 2026 · kosmos.page

Every Kosmos plan and price →

Strong points and limits

Strong points

  • Organizes research and tracks theme coverage
  • Identifies research gaps and can search the web
  • Reviews drafts for progress and consistency
  • Projects remain usable as Markdown files

Limits

  • Requires Claude Code and a Claude Pro or Max subscription
  • Beta signup requires manual review and approval
  • AI does not write manuscript prose
  • No rewrite controls

Who it suits

Kosmos is aimed at nonfiction authors who want a structured book-production process and are willing to provide beta feedback. It suits writers comfortable using Claude Code and Markdown files.

Verdict

Kosmos offers a structured workflow and research and draft-review support, while leaving manuscript prose to the author. Its free beta still depends on a separate Claude subscription and approved access.

Where Specifiction places it

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