Privacy Policy for Spatial Book

Effective Date: September 21, 2026

Spatial Book respects your privacy. The app does not collect, store, transmit, or share any personal information or user data.

Information Collection

Spatial Book does not collect any personal information.

The app does not use:

• User accounts

• Analytics services

• Advertising services

• Tracking technologies

• Cookies

• Third-party data collection services

• Remote servers for storing user data

Documents and Files

Spatial Book allows you to open documents such as text files and PDF files from your device.

Documents opened in Spatial Book are used only to display their contents within the app. Their contents are not uploaded to external servers, transmitted to the developer, or shared with third parties.

Hand Tracking

Spatial Book may use hand tracking provided by visionOS to recognize gestures used to interact with books and pages in immersive space.

Hand tracking data is used only for real-time interaction within the app and is not collected, stored, transmitted, or shared by Spatial Book.

Data Sharing

Spatial Book does not collect user data and therefore does not sell, share, or provide personal data to third parties.

Children's Privacy

Spatial Book does not knowingly collect personal information from anyone, including children.

Changes to This Privacy Policy

This Privacy Policy may be updated if the features of Spatial Book change in the future. Any changes will be reflected on this page.

Contact

If you have questions about this Privacy Policy, please contact the developer through the Spatial Book support page.

Spatial Book — Features and How to Use

 

• Core Concept

  • Spatial Book is a spatial document reader designed for Apple Vision Pro.

  • It can import text files and PDF documents and display them as three-dimensional books.

  • Pages can be turned directly by pinching and dragging them, similar to turning a physical sheet of paper.

  • Pages bend dynamically as they are dragged.

  • If you release a page midway through a turn, it falls toward the nearer side depending on its position.

  • Documents can be opened either in a standard Window or in Immersive Space.

  • When Advanced Mode is enabled, pages can also be treated as individual spatial objects rather than only as pages inside a book.

• Supported Files

  • PDF files can be imported.

  • Text files can be imported.

  • The current text importer supports UTF-8, Shift_JIS, EUC-JP, and UTF-16 encoding detection.

  • The imported file name is used as the book title.

  • A built-in sample book is included.

  • Multiple imported documents can be kept in the library and opened independently.

• Library

  • Use “Open File” to import a text file or PDF.

  • Use “Open Sample” to open the built-in sample document.

  • Imported documents appear in the Bookshelf.

  • Each document can be opened either:

    • in a Window

    • in Immersive Space

  • Multiple books can also be sent into Immersive Space together.

  • The Library window can be reopened while Immersive Space is active.

  • The entire Immersive Space can be closed from the Library.

  • A confirmation is shown before closing the whole space because spatial layouts and placed pages cannot currently be restored afterward.

• Text Typesetting

  • Text size can be adjusted for imported text files.

  • The current range is 13 pt to 26 pt.

  • Horizontal left-to-right layout is supported.

  • Vertical right-to-left layout is also supported.

  • In vertical mode, book opening direction and page navigation are adjusted to match a right-bound book.

  • PDF documents use their original page layout and are always treated as left-bound documents.

  • Changing typesetting settings rebuilds affected books using the new settings.

• Paper Quality / Rendering Quality

  • The rendering quality of spatial page cards used in Advanced Mode can be adjusted.

  • Standard

    • Prioritizes the number of visible pages and lower resource usage.

  • High

    • Balances rendering quality and page count.

  • Ultra

    • Prioritizes image quality and renders spatial cards at a resolution closer to the main book pages.

  • Higher quality settings reduce the number of high-resolution page textures kept in memory at the same time.

  • For Stack and Grid layouts, the current number of detailed pages per group is:

    • Standard: up to 60 pages

    • High: up to 40 pages

    • Ultra: up to 24 pages

  • Row Mode can represent many pages while only loading detailed textures around the currently focused page.

  • The current detailed texture windows for Row Mode are:

    • Standard: focused page + 12 pages on each side, up to 25 loaded pages

    • High: focused page + 8 pages on each side, up to 17 loaded pages

    • Ultra: focused page + 5 pages on each side, up to 11 loaded pages

  • Stack, Grid, and Row layouts are designed so that large documents do not require every page image to remain loaded on the GPU at the same time.

• Window Mode

  • Displays the document as a 3D book inside a visionOS volume window.

  • Pages can be turned directly with pinch-and-drag gestures.

  • Previous and next page buttons are provided below the book.

  • Page buttons support press-and-hold for continuous page turning.

  • The current page or spread position is displayed.

  • A slider allows quick navigation to distant parts of the document.

  • In vertical text mode, page navigation and slider direction are reversed to match right-to-left book progression.

  • Resizing the volume window also scales the 3D book accordingly.

• Immersive Mode — Basics

  • Books can be placed as 3D objects in the surrounding space.

  • Multiple books can be opened in the same Immersive Space.

  • Newly opened books are initially arranged next to one another.

  • Each book can be read and moved independently.

  • One book is treated as the currently focused book for menu operations.

  • When focus changes, a temporary light-blue marker appears above the selected book so you can see which book is active.

  • The marker gradually shrinks and disappears after a short time.

• Immersive Mode — Page Turning

  • Pages can be turned directly with pinch-and-drag gestures, just like in Window Mode.

  • Previous and next page controls are also available from the spatial menu.

  • Vertical text uses right-to-left page progression.

• Immersive Mode — Moving Books by Hand

  • Either hand can be used.

  • Making a fist near a movable book grabs the nearest eligible book.

  • If several books are nearby, the nearest one to the hand is selected.

  • While keeping the hand closed, moving the hand moves the book with it.

  • Opening the hand releases the book and leaves it at the current location.

  • A grab begins only when the fist gesture is first detected, which helps prevent unintended repeated grabbing while the hand remains closed.

  • While holding a book, wrist orientation can also be used to adjust the viewing tilt.

  • A “Reset Tilt” control restores the book to its default reading angle.

• Immersive Mode — Summoning Distant Books

  • Look at a distant book and double-pinch to bring it toward you.

  • This allows books to be retrieved without physically moving across the room.

  • The summoned book is placed slightly in front of and below the user’s head position.

• Immersive Mode — Resizing Books

  • A light-blue spherical handle appears at the lower-right corner of the focused book.

  • Pinch and drag the handle to resize the entire book.

  • The resize handle appears only when that book is focused and its control menu is expanded, helping keep the reading view uncluttered.

• Immersive Mode — Spatial Control Menu

  • A shared control panel is used for the currently focused book.

  • The panel displays information such as the book title and current mode or status.

  • By default, the panel appears in front of the user.

  • It does not rigidly follow every small head movement.

  • Instead, it begins moving only after the user moves far enough away, then smoothly catches up.

  • The panel continually rotates to face the user.

  • The panel can be pinned in place.

  • When pinned, it stops following the user.

  • A light-blue handle appears above the pinned panel.

  • Pinch and drag that handle to reposition the panel anywhere in space.

  • Unpinning the panel restores its head-following behavior.

  • The panel can also be collapsed.

  • When collapsed, it becomes a small “…” button to reduce visual obstruction while reading.

  • Pressing the button expands the full panel again.

  • A Library button reopens the Library window.

  • “Close Book” closes only the currently focused book from Immersive Space.

  • A confirmation is shown before closing a book if spatial layouts or detached pages will be removed.

  • Other open books and the Immersive Space itself remain active when one book is closed.

• Focus Mode / Background

  • Passthrough (MR)

    • Displays books over the real environment.

  • Focus - Dark

    • Hides passthrough and places the user in a dark fully immersive environment.

  • Focus - Grid Room

    • Uses a fully immersive environment with a large grid floor.

    • Hides the real environment while preserving a strong sense of spatial position.

    • The grid fades into darkness toward the edges to create the impression of a larger continuous space.

• Advanced Mode

  • Advanced Mode is disabled by default.

  • With Advanced Mode off, Spatial Book focuses on the standard reading experience.

  • Enabling Advanced Mode adds the following spatial document layouts:

    • Book

    • Stack

    • Grid

    • Row

  • You can switch directly between Book, Stack, Grid, and Row modes.

  • Accordion is a special interactive expansion state entered from Stack Mode.

  • Turning Advanced Mode off while another layout is active returns documents to normal Book Mode.

  • This allows users who only want a traditional reader to ignore the more experimental spatial tools entirely.

• Advanced — Book Mode

  • Standard 3D book presentation.

  • Pages can be turned directly.

  • Previous and next page controls are available from the menu.

  • The book can be grabbed and moved with a fist gesture.

  • The blue handle can be used to resize the book.

  • “Reset Tilt” restores the default reading angle.

  • Other Advanced layouts can always be returned to Book Mode.

• Advanced — Stack Mode

  • Breaks the document into individual page cards and displays them as physical stacks of paper.

  • Large documents are divided into multiple manageable stacks instead of one extremely thick stack.

  • Stack size depends on the selected Paper Quality setting.

  • Each stack can be positioned independently.

  • Tapping a stack selects it as the active stack.

  • Detailed textures are loaded around the currently selected stack.

  • A stack can be grabbed with a fist and moved through space.

  • When several stacks are present, only the stack nearest to the grabbing hand is moved.

  • Other stacks remain where they are.

  • Looking at a stack and double-pinching summons only that stack toward the user.

  • While holding a stack with one fist, bringing the other fist close to it begins Accordion expansion.

• Advanced — Accordion Expansion

  • Accordion is a special spatial expansion entered from Stack Mode.

  • Grab a stack with one fist.

  • Bring the other hand close while also making a fist.

  • The pages expand between the two hands.

  • The positions of the hands determine the two ends of the expanded page sequence.

  • Moving the hands farther apart increases spacing between pages.

  • Moving them closer together compresses the layout.

  • The pages are oriented to remain readable from the user’s position.

  • Opening either hand freezes the current arrangement in space.

  • Once frozen, both hands can be released while the pages remain spread out.

  • Previously frozen stacks can remain expanded even while another stack is manipulated.

  • After freezing, moving a fingertip close to a page causes the nearest page to protrude slightly as a preview.

  • Pinching that page pulls a single page out of the Accordion layout.

  • The detached page immediately follows the pinching hand.

  • Releasing the pinch leaves the page at that position.

  • The two ends of a frozen Accordion layout can be grabbed again with two fists to resume adjusting the spread.

  • The layout also supports grabbing the two ends with opposite hands.

  • An “Adjust” button is available as an alternative way to resume editing if the gesture is difficult to perform.

  • “To Stack” collapses the expanded Accordion back into Stack form.

• Advanced — Grid Mode

  • Displays pages as a spatial grid for overview and comparison.

  • Many pages can be viewed simultaneously.

  • Large documents are divided into multiple Grid panels.

  • Each panel contains a manageable number of pages.

  • Only pages near the currently active panel keep detailed textures loaded.

  • Looking at another Grid panel and pinching brings that panel into the active position.

  • Looking at and pinching a page on the active Grid detaches that page and places it into the surrounding space.

  • Detached pages are initially positioned in front of the user.

  • Multiple detached pages are offset horizontally to avoid directly overlapping one another.

  • Detached pages remain in space when switching to another Grid panel.

  • Pinching the original Grid slot of a detached page again returns that page to the Grid.

  • The Grid itself can be grabbed with a fist and repositioned.

  • The menu displays information such as page count, current panel, and number of detached pages.

  • A Return control can return detached pages to their source layout.

• Advanced — Manipulating Detached Pages

  • Pages can be detached from Grid, Accordion, and Row layouts and treated as independent spatial objects.

  • Detached pages remain in space independently of their source layout.

  • Pinch and drag a detached page to move it.

  • A placed page can be grabbed again later.

  • Re-grabbing uses a stricter proximity and pinch threshold to reduce accidental page pickup.

  • Detached pages can be scaled using a magnification gesture.

  • Detached pages can be rotated freely using a 3D rotation gesture.

  • The same page can also be pinched with both hands.

  • The distance between the hands controls page scale.

  • Hand orientation can be used to rotate the page.

  • If one hand is released during a two-handed transformation, the remaining hand can continue holding the page.

  • A page can also be transferred from one hand to the other.

  • This allows pages from different parts of a document to be placed next to one another for comparison.

  • Detached pages can also be returned to their original layout in a batch.

• Advanced — Row Mode

  • Arranges document pages in one long horizontal row.

  • Instead of turning one page at a time, the entire document can be browsed as a continuous spatial sequence.

  • Pinch and drag horizontally to scroll through the row.

  • Larger swipe distances can move through multiple pages continuously.

  • When the gesture ends, the row snaps to the nearest page.

  • Previous and next controls are also available from the menu.

  • The current page and total page count are displayed.

  • Tapping a Row card selects that Row as the active document.

  • Pinching and holding a page without immediately swiping allows that page to be detached from the Row.

  • Detached pages can then be placed and manipulated independently like pages from Grid or Accordion.

  • The entire Row can be grabbed with a fist and repositioned in space.

  • Two visual styles are available:

    • Flat

    • Emphasized

  • Flat mode keeps pages aligned uniformly in the row.

  • Emphasized mode moves the focused page forward and enlarges it for easier reading.

  • Row Mode does not keep full-resolution textures on every page simultaneously.

  • Only the pages near the current focus are loaded in detail.

  • The current implementation can represent up to 1,000 Row cards.

• Using Multiple Documents in Space

  • Multiple books can coexist in the same Immersive Space.

  • Each document can independently use Book, Stack, Grid, or Row layout.

  • For example, one document can remain open as a normal book while another is displayed as a Grid.

  • The shared control panel operates on one focused document at a time.

  • Interacting with another book, stack, Grid, or Row changes the focused document.

  • A light-blue indicator briefly shows which document is now active.

  • Closing one document does not close the others.

• Interaction Safeguards

  • Closing a book requires confirmation when spatial content may be lost.

  • Closing the entire Immersive Space also requires confirmation.

  • The interface warns that current spatial layouts cannot be restored after closing.

  • If detached pages exist, the close confirmation indicates that they will also be removed.

  • Fist-based grabbing is triggered only when the fist gesture begins, helping prevent repeated unintended grabs.

  • Page extraction from Accordion also reacts to the start of a pinch rather than a continuously held pinch.

  • Picking up an already detached page uses a stricter pinch threshold.

  • During two-handed Accordion manipulation, normal book grabbing is temporarily suppressed.

  • The spatial menu does not rigidly follow every small head movement, reducing distracting motion.

  • Large documents use selective texture loading so that only nearby or relevant pages stay at high resolution.

• In Short

  • In its simplest form, Spatial Book is a reader that turns text files and PDFs into 3D books that can be read by physically turning their pages.

  • In Immersive Mode, it becomes a spatial library where multiple books can be placed around the user.

  • With Advanced Mode enabled, it also becomes a spatial document viewer where pages can be separated from the book, stacked, expanded, arranged in grids or rows, detached, moved, scaled, rotated, and compared directly in space.