Matryoshka Mind Map

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About this app

This mind map is designed to help you "drill down" into ideas rather than just "expand" them.

Child elements are drawn inside their parent cards. Like Matryoshka dolls—where smaller ideas sit within larger ones—the visual layout reflects this relationship: tapping zooms in to dive one level deeper, while returning shrinks the view back to its original position. No matter how deep you go, you never lose track of which idea you are currently exploring.

■ Reorganize hierarchy with simple gestures
・Tap: Dive into that element
・Swipe Right: Make it a child of the element above (demote)
・Swipe Left: Move it up to the parent level (promote)
・Drag: Reorder within the same level
・Double-tap: Edit text

■ Split off or merge branches
Swipe left on a top-level element to spin it off—along with all its sub-elements—into a new, independent mind map.
Conversely, you can merge maps together into one.
Split off notes that have grown too large from a simple idea, or bundle related notes together.
You can restructure your map at any time.

■ Use as a To-Do list
Select "TODO" when creating a map to add checkboxes to each element.
Checking a parent element marks all its sub-elements as complete.
Bulk-delete checked items or clear all checkboxes with a single tap.

■ Sharing and Exporting
・Collaborate on the same map with other users simply by specifying an email address
・Copy as indented text or send via the OS standard sharing sheet
・URLs entered in elements automatically become clickable links that open in your browser

■ Other Features
・Adjust the visual depth of nested levels using the zoom/scale slider
・Start anonymously without an account; link an email address later
・Supports Japanese and English (automatically follows device language settings)
・Free to use (displays banner ads)

Use this app as a space to preserve the nested structure of your thoughts exactly as they are.

What’s new

Improved URL image previews to better match each photo's aspect ratio
Made the footer semi-transparent for a lighter feel
Fixed the footer/button shifting when an ad fails to load
Fixed a brief flicker into collapsed view while scrolling
Improved the AI deep-dive prompt to avoid duplicated items