A mind map designed for digging deep into ideas rather than spreading them out.

Mind maps get cluttered as they grow. Matryoshka Mind Map nests child items inside their parents so you drill down one level at a time. For the big picture, switch to a classic mind map. Use it for brainstorming, notes and to-dos on your phone, tablet and the web.

■ Two ways to see your map
・Matryoshka view — child items sit inside their parent card. Swipe left and the item grows into the next level; go back and it shrinks into place
・Mind map view — see the whole map with branches spreading left and right from the center. You can add, edit and delete items here too

■ Reshape the hierarchy with your finger
・Tap — edit the text
・Swipe left (or click ">" at the right end of a row with a mouse) — go inside that item
・Press and hold to grab — reorder within a level, drop into another item, or move up to the parent level
・Swipe right anywhere on the screen — go back one level (at the top level, back to your map list)

■ Spin off or merge branches
Drop a top-level item on the header to turn it into a new map, or merge maps into one. Reorganize any time.

■ Related maps
・Relate an item to other maps. Tap a related map on the card to open it
・On a related map, see which items it is related to
・The relation graph shows how all your maps connect, at a glance

■ Documents and diagrams
・Add Markdown documents as items: write one in the app or import a .md file
・Shown formatted, with Mermaid diagrams drawn in place
・Share or save them as .md files

■ A nested to-do list, too
・Choose "TODO" when creating a map and every item gets a checkbox
・Checking a parent marks everything inside it as done
・Add due dates and start dates. Overdue and due-today items are highlighted, and items not yet started are dimmed
・Get a reminder before a due date. Tap it to open that item's map

■ On your phone and on the web
Sign in with the same account to use the same maps on your phone, tablet and the web (matryoshkamap.web.app). Start with no sign-up, and link an email, Google or Apple account later.

■ Connect directly with AI agents
We've released a free companion tool that lets MCP-compatible AI agents like Claude Desktop and Claude Code read and write your maps directly. Just say "organize what we talked about into a map" or "I finished that task," and it's reflected in your map. They can also read and create documents.

■ Share & export
・Edit the same map together with other users just by entering their email address
・Publish a read-only view to anyone with the link
・Copy or share as indented text, or as Markdown with checkboxes and due dates
・Paste a Markdown list to import it as a new map
・URLs in items automatically become tappable links

■ Free and Premium
The free plan includes up to 20 maps with 300 items and 3 documents each (with banner ads).
Premium (first month free) gives you:
・No ads
・Unlimited maps, items and documents
・Images in your maps (up to 1 GB in total)
Premium is purchased in the mobile app and also applies on the web when you sign in with the same account.

■ And more
・Search map names and items together
・Adjust how deep the nesting appears with the scale slider
・Keyboard shortcuts with an external keyboard (press ? for the list)
・Japanese and English (follows your device language)
・Dark mode

Use it as a place to keep the nested structure inside your head, exactly as it is.