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Core

The all-in-one app for writers — from concept to PDF and ebook output.·corewrite.app

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Core is a macOS native writing app for long-form work such as novels, academic papers, and essays. It supports Japanese typesetting features including vertical writing, ruby, emphasis marks, and manuscript-paper grids, and exports to PDF, DOCX, EPUB, and other formats. It includes an 'agentic AI editor' that reads an entire writing project for context-aware critique, plus an AI research assistant that searches real sources such as the National Diet Library, Library of Congress, Open Library, and Internet Archive.

What it's for

Writing long-form novels (literary fiction, historical fiction, sci-fi, mystery)Writing nonfiction books, academic papers, and long essaysManaging serialized works and multi-volume seriesIntegrating research and worldbuilding materials into a writing project

Features 20

  • Agentic AI editor that reads the entire writing project for context-aware critique
  • AI research assistant searching National Diet Library, Library of Congress, Open Library, and Internet Archive
  • Emphasis marks (bouten)
  • Export to PDF, DOCX, EPUB, TXT, and Markdown; formatted copy for web platforms like note, Kakuyomu, Shousetsuka ni Narou, and pixiv
  • Focus mode (fullscreen) and typewriter mode
  • Four workspaces: Writing, Outline (structure), Corkboard (sticky notes), Output
  • Full-text OCR search within NDL Digital Collections with direct jump to matching pages
  • Illustration gallery for scanned reference materials
  • Import from Scrivener (.scriv) preserving folder/chapter structure
  • Import from Word (.docx) preserving ruby, footnotes, comments, images, and headings
  • Local-first storage as .core package files
  • Manuscript-paper (genkou youshi) grid layout with saved custom presets
  • Non-destructive alternate draft lanes for rewriting passages
  • Output presets for book trim sizes (bunko, shinsho, A4, KDP sizes, etc.)
  • Pre-submission checks for margins, image resolution, missing fonts, and formatting omissions
  • Ruby (furigana) annotations
  • Signed 'Proof of Human Authorship' certificate tracking keystrokes vs. pasted text
  • Tate-chuu-yoko (rotated horizontal numerals within vertical text)
  • Vertical (tategaki) and horizontal writing support
  • Writing progress dashboard tracking daily/weekly/monthly keystrokes

At a glance

free trial
TypeDesktop app
DeploymentInstalled (local)
PlatformsmacOS
LanguagesJapanese, English
Fornovelists, academic writers, essayists, nonfiction writers
Company不器堂

Integrations

National Diet Library SearchLibrary of CongressOpen LibraryInternet ArchiveScrivenerWordnoteKakuyomuShousetsuka ni NaroupixivAnthropic Claude

Pricing

Prices are stated in Japanese yen: Pro is ¥1,200/month and Max is ¥4,000/month. The Pro plan includes a 14-day free trial with no payment required upfront.

Pro¥1200/mo

Includes a 14-day free trial; no payment due immediately.

Sufficient AI usage for daily writing

Max¥4000/mo

5x the AI usage of the Pro plan, Advanced reasoning, Deeper context understanding, 'Deep research' mode for document research

5x the AI usage of the Pro plan

Last checked 20 days ago·