Core: AI Writing Studio

Reads your work. Real sources.

Free · In‑App Purchases

Now on iPhone and iPad: vertical Japanese with ruby and emphasis dots, PDF and web-format export, and an AI editor that reads your manuscript. Free 2-week trial. A writing app for people who take Japanese writing seriously, now on iPhone and iPad. Vertical text, your manuscript, and the research, all in one place. Core brings drafting, reference, and revision into one workspace: an AI editing partner that has read your whole project, and reference search that returns only real sources. It opens the same projects as Core for Mac, so you can write at your desk and pick up where you left off on the go. — 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 such as the National Diet Library of Japan and returns only real sources, never fabricated references. — A real writing editor • Vertical and horizontal layout • Ruby (furigana), emphasis dots, and upright numbers in vertical text • Word count, 400-character manuscript-page count, and word goals • Add photos and images to your manuscript or notes — Export the way you want • PDF with detailed control over page size, margins, and fonts, including spreads for binding and a colophon • Copy in the formats of note, Kakuyomu, and Shosetsuka ni Naro, ready to paste • Word (DOCX), EPUB, and plain text • Preview before you export — Project management • Manuscript, notes, and reference material in one project • Corkboard for chapter overview • Outliner for building the plot — Quick notes Start a note straight from the app icon or a widget. — The same projects as on your Mac Open a project kept in iCloud Drive or another cloud folder on Mac, iPhone, and iPad alike. When changes from two devices overlap, Core takes care not to lose what you wrote. — Your work stays with you Manuscripts are saved as files in a place you choose. Your text is never used to train AI models. — Who it's for — • Japanese-language writers who need vertical typesetting that doesn't fight them • Writers who want to keep going on their Mac manuscript while away from the desk • Anyone who wants AI assistance without losing control of the manuscript — Pricing — Editing is free. AI features require a subscription. • Pro plan: $7.99 / month, with a 14-day free trial • Max plan: $26.99 / month If you already subscribe on Mac (App Store or direct), sign in with the same account and your plan carries over. — Requirements — • iOS 17.0 / iPadOS 17.0 or later • 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

  • This app hasn’t received enough ratings or reviews to display an overview.

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

Information

Seller
Hukido
Size
11.5 MB
Category
Productivity
Compatibility
Requires iOS 17.0 or later.
  • iPhone
    Requires iOS 17.0 or later.
  • iPad
    Requires iPadOS 17.0 or later.
  • Mac
    Requires macOS 15.0 or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
English and Japanese
Age Rating
13+
  • 13+
  • Learn More
  • Infrequent
    Profanity or Crude Humor
    Horror/Fear Themes
    Alcohol, Tobacco, Drug Use or References
In-App Purchases
Yes
Copyright
© 2026 不器堂
  • Developer Website
  • Privacy Policy

    • More by Hukido