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Kosmos
What it is
Kosmos is a free, structured method for producing nonfiction books that runs inside Claude Code. It guides projects through four phases: ideation, research, structure, and writing. During research, Kosmos organizes findings as small tagged entries, tracks which themes have been covered, and identifies gaps that may need more investigation. When web access is available, it can search for material to help address those gaps. In the writing phase, AI reviews drafts against an eight-point checklist, tracks progress, and checks consistency; it 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 the maker says any Markdown editor can be used, and users keep their files if they stop using Kosmos. The beta is early-stage, access requires manual review and approval, and the maker is seeking feedback from authors willing to try the approach. Users must provide Claude Code and their own Claude Pro or Max subscription.
For and against
For
- Four phases organize the book-production process.
- Tracks research coverage and identifies gaps.
- AI reviews drafts against an eight-point checklist.
- Markdown projects work as Obsidian vaults.
- Users keep their project files if they leave.
Against
- Requires a Claude Pro or Max subscription.
- Beta access requires manual review and approval.
- No rewrite controls are included.
- Web research depends on web access being available.
The verdict
Kosmos provides a defined process for organizing research and reviewing nonfiction drafts, without generating the manuscript prose. It is free during beta, but requires users to supply Claude Code and a Claude Pro or Max subscription.
Who it suits
Kosmos is for nonfiction authors interested in a structured book-production process and willing to offer feedback during beta. It suits people already able to provide Claude Code and a Claude Pro or Max subscription.
Plans and prices
Beta
Free during beta · requires your own Claude subscription · access approved manually
Read 9 Oct 2026 · kosmos.page
On the record
- Access
- During beta, the maker manually reviews and approves every signup.kosmos.page · read 8 Oct 2026
- AI role
- AI organizes research, tracks coverage gaps, advises on structure, and reviews drafts; it does not write manuscript prose.kosmos.page · read 9 Oct 2026
- Beta access
- During the beta, the maker manually reviews and approves account access.kosmos.page · read 9 Oct 2026
- Beta status
- Kosmos is described as an early beta, and the maker says the tooling is new and feedback is welcome.kosmos.page · read 8 Oct 2026
- Draft review
- AI reviews drafts against an 8-point checklist and checks for consistency.kosmos.page · read 9 Oct 2026
- Editor compatibility
- Obsidian is recommended, and the maker says any Markdown editor works.kosmos.page · read 8 Oct 2026
- File format
- Project files are Markdown and work as an Obsidian vault; the maker says users keep their files if they stop using Kosmos.kosmos.page · read 9 Oct 2026
- Integrations
- Kosmos runs inside Claude Code; Obsidian is recommended, and any Markdown editor can be used.kosmos.page · read 9 Oct 2026
- Intended users
- The maker is seeking authors interested in a structured approach to book production who are willing to provide feedback.kosmos.page · read 9 Oct 2026
- Maker
- The maker identifies himself as Joakim Achren and says he has self-published nonfiction books.kosmos.page · read 8 Oct 2026
- Prerequisite
- Kosmos requires Claude Code and a Claude Pro or Max subscription, which users provide themselves.kosmos.page · read 8 Oct 2026
- Process
- Its four phases are ideation, research, structure, and writing.kosmos.page · read 8 Oct 2026
- Purpose
- Kosmos is a structured methodology for producing nonfiction books that runs inside Claude Code.kosmos.page · read 9 Oct 2026
- Requirements
- The maker says Claude Code requires a Claude Pro or Max subscription.kosmos.page · read 9 Oct 2026
- Research
- Kosmos organizes research into atomic tagged entries, tracks theme coverage, and identifies gaps for further research.kosmos.page · read 8 Oct 2026
- Research organization
- Kosmos organizes research into atomic, tagged entries and tracks coverage across themes.kosmos.page · read 9 Oct 2026
- Setup
- Claude Code handles installation of the kosmos-cli, authentication, and project setup.kosmos.page · read 9 Oct 2026
- Support
- The maker asks beta users to share feedback about what works and what does not.kosmos.page · read 9 Oct 2026
