Folio: Markdown+RST+Code+PDF

Document Reader for Developers

Free · In-App Purchases

Fast and private reader of Markdown, RST, PDF, and source code with embedded support for Mermaid diagrams. Folio is a small, native reader for the files a working life accumulates: Markdown notes and READMEs, reStructuredText and Sphinx documentation, source code, configuration and data files, PDFs, and images. It gives them one calm library, clear typography, and room to focus, on iPhone, iPad, and Mac. READ MARKDOWN THE WAY IT WAS MEANT TO LOOK Headings, lists, tables, task lists, blockquotes, code blocks, links, and images render on a page designed for reading, in light or dark, with serif or sans-serif type, and with text size, line spacing, and page width under your control. Equations in TeX notation render offline. An outline jumps between headings, Find highlights every match, Show Source reveals the document's own text, and Share offers the source file or a PDF of the page. The HTML that READMEs use for badges, centered logos, and collapsible sections renders too. reStructuredText files render the same way, with the Sphinx signatures, version notes, and cross-references of Python's own documentation. EVERY TEXT FILE, EXACTLY AS WRITTEN JSON, YAML, TOML, XML, HTML, CSS, shell scripts, Makefiles, logs, diffs, and source code in any common language open verbatim, with tabs, indentation, and long lines preserved. Code is colored by language, with three schemes and six editable colors, or no coloring at all if you prefer. PDFS AND IMAGES, WITHOUT LEAVING THE APP PDFs open with their own outline and Find. JPEG, PNG, HEIC, GIF, TIFF, WebP, BMP, and AVIF images fit the screen and zoom smoothly. Both are viewed from your files where they are; only one opened from a link is downloaded and kept. FILES, FOLDERS, AND LINKS Open a document, browse a whole folder, drop a file into the window, or paste a link. GitHub file links and direct HTTPS links to text, PDFs, and images are saved for offline reading, and text is refreshed while you read. Private repositories work with a personal access token that stays in your device's Keychain. YOURS, AND ONLY YOURS There is no account, no analytics, no advertising, and no upload service. Documents, bookmarks, and settings stay on your device. A single switch stops documents from loading images from the web. FREE TO BEGIN, SIMPLE TO UNLOCK Read complete text documents up to 10 KB for free, and view PDFs and images without limit. Folio Plus unlocks larger documents, Export PDF, and, on Mac, Print: • Folio Plus Lifetime: a one-time purchase of $19.99 (USD) • Folio Plus Yearly: an auto-renewing subscription of $9.99 (USD) per year Both support Family Sharing. Subscriptions are charged to your Apple Account at confirmation and renew automatically unless canceled at least 24 hours before the end of the current period. Manage or cancel them in your Apple Account settings. Privacy Policy: https://bluetaollc.github.io/FolioApp/privacy/ Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Requires iOS 17, iPadOS 17, or macOS 14 or later.

Ratings & Reviews

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Bug fixes. Support for Mermaid diagrams.

Version 1.1

The developer, BlueTao LLC, 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

    The developer does not collect any data from this app.

    Privacy practices may vary based, for example, on the features you use or your age. Learn More

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

    • Supported Features

      • Larger Text

      • Dark Interface

    Information

    Seller
    BlueTao LLC
    Size
    11.5 MB
    Category
    Developer Tools
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • iPad
      Requires iPadOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Age Rating
    4+
    In-App Purchases
    Yes
    • Folio Plus USD 9.99
    • Folio Plus Lifetime USD 19.99
    • Learn More
    Copyright
    © 2026 BlueTao LLC
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

      Some in-app purchases and subscriptions may be shareable with your family group when Family Sharing is enabled. Learn More