A macOS writing app that reads your manuscript: AI editor, research agents, and export — print-ready PDF, web-format copy, and manuscript images. Free 2-week trial.
A macOS app for people who take Japanese writing seriously — vertical text, your manuscript, and the research, all in one window.
Core brings drafting, reference, and revision into one workspace: an AI editing partner that has read your whole project, reference search that returns only real sources, and a Writing Certificate that shows a person wrote the work.
— AI Editor — the partner that knows your work
The AI has read your entire project. Ask it to evaluate an opening, sharpen a piece of dialogue, or test an idea against the rest of the manuscript. Unlike generic AI tools, it answers in the context of what you've actually written.
— AI Research Agent — sources you can trust
Ask the AI to find a citation. It searches scholarly databases (National Diet Library of Japan, Library of Congress, Open Library, Internet Archive) and returns only real sources — never fabricated references.
— A real writing editor
• Vertical and horizontal layout
• Ruby (furigana) and emphasis dots, rendered correctly
• Word count and 400-character manuscript-page count
• Distraction-free full screen
— Project management
• Tree structure for manuscript, notes, and reference material
• Corkboard for chapter overview
• Outliner for building the plot
— Writing Certificate — showing a person wrote it
Core records how a manuscript was written, locally, and can issue a certificate that estimates the work was written by a person. The record never leaves your Mac.
— Your work stays with you
Manuscripts are saved as .core packages on your Mac. No cloud lock-in. Your text is never used to train AI models.
— Import and export
Bring in existing Scrivener projects and Word (DOCX) files. Export to PDF, DOCX, EPUB, or plain text.
— Who it's for —
• Writers working on a single piece across many sessions
• Anyone who wants AI assistance without losing control of the manuscript
• Japanese-language writers who need vertical typesetting that doesn't fight them
• Writers tired of context-switching between editor, AI, and research browser
— Pricing —
• Pro plan: $7.99 / month
• Max plan: $26.99 / month
• 14-day free trial on the Pro plan
— Requirements —
• macOS 15.0 or later
• Apple Silicon or Intel
• Internet connection required for AI features
— Support —
Email: contact@corewrite.app
Privacy: https://corewrite.app/privacy
Terms: https://corewrite.app/terms
— About the developer —
Core is built by a single developer who wanted a writing tool worth using session after session. Every feature ships only when it earns its keep in real writing sessions.
Ratings & Reviews
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Improvements
- Saving is now sturdier. When your work syncs through iCloud, Google Drive, Dropbox, or a similar service, there is far less risk of losing text to an unexpected save. If two versions of a page come into conflict, Core now keeps the changes from both wherever it can; where the changes fall inside the same paragraph, the second one is kept as an alternative, so you can decide between them yourself later.
Version 2.9.0
The developer, Hukido, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
Purchases
Contact Info
User Content
Identifiers
Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
Usage Data
Diagnostics
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More