MyCodex - Rules & Dictionary

Reference

Only for iPhone

Free · Designed for iPhone. Not verified for macOS.

iPhone

Read Japanese laws and your own rules and dictionaries in one careful typesetting. Download laws from e-Gov, import your own as XML, and keep it all on your device. Read Japanese laws, your own rules and your own dictionaries — all in the same typesetting. MyCodex works in English and Japanese. The laws it downloads are the laws of Japan, in Japanese, from e-Gov, the Japanese government's law database. It puts laws, your own rules and your own dictionaries on one bookshelf: company policies, club bylaws, tournament rules, glossaries. Documents that used to live in PDFs and wikis become something you can look up article by article. ■ Find laws and keep them Search e-Gov by law title or full text, and add laws to your library. Once added, a law can be read without a connection. From its amendment history you can also open past versions and versions not yet in force. ■ Follow references between laws References in the text are links. Tap a reference to another law to open it at the article, paragraph or item it points to. Tap a reference to an article of the same law to check it without losing your place. Go to any article by typing its number on a keypad made for article numbers, fold the table of contents by part and chapter, and open tables full screen. ■ Your own rules, in the same form as the law Import rules written in the Japanese Standard Law XML format from the Files app or AirDrop. MyCodex reads their parts, chapters, sections, articles, paragraphs and items, and builds a table of contents. Revised editions of the same rules are kept together. ■ Make your own dictionary Import glossaries, quotation collections, dialect dictionaries — anything made of headwords and entries — as XML. Headwords narrow down as you type, and references inside an entry take you to other entries or to articles. ■ Create them without writing XML You can also make rules and dictionaries in MyCodex Editor, a separate web editor that runs in a browser on your computer (https://mycodex-editor.rpaka-farm.jp). Export what you make and import it into the app, without writing XML by hand. ■ Typesetting for reading Choose Mincho (serif) or Gothic (sans-serif), vertical or horizontal writing, text size and line spacing. While you read, the toolbars fade away and leave only the text; tap to bring them back. Dark Mode is supported. ■ Bookmarks and history Bookmark articles and headwords, and gather them into collections across documents. To bookmark an article, long-press its number. History takes you back to where you were reading. ■ Your data stays on your device Imported documents, bookmarks and history are stored on your device and never sent to the developer. There is no analytics. The only network access is to e-Gov, to search for and download laws and the list of laws used for links. Getting started On the empty library, "Try a Sample" opens the Constitution of Japan, sample rules and sample dictionaries for reading (their content is in Japanese), so you can see how your own documents will look. Samples are not added to your library. About the law data Law data is retrieved from e-Gov Law Search (https://laws.e-gov.go.jp/) and typeset by MyCodex. MyCodex is developed by an individual and is not an official app of the Japanese government or any government agency. The accuracy of the laws shown is not guaranteed; check e-Gov Law Search or the Official Gazette for the authoritative text.

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The developer, Kokubo Ritsuki, 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 Not Collected

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    The developer indicated that this app supports the following accessibility features. Learn More

    • Supported Features

      • Dark Interface

      • Differentiate Without Color Alone

      • Sufficient Contrast

      • Reduced Motion

    Information

    Seller
    Kokubo Ritsuki
    Size
    11.6 MB
    Category
    Reference
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    English and 3 more
    • English, Japanese, Simplified Chinese, Traditional Chinese
    Age Rating
    4+
    Copyright
    © 2026 rpaka-farm
  • Developer Website
  • Privacy Policy

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