Doodle 3DS

Collab Doodle
General
Author	Thomas Armstrong
Type	Other Apps
Version	1.3.3
License	MIT License
Last Updated	2026/07/01
Links
Download
Website
Source

Collab Doodle is a Nintendo 3DS homebrew client for drawing together on shared server-backed canvases. The bottom screen is the drawing surface, and the top screen shows a minimap, channel/status information, controls, and the current app version.

Server Information:

• Live canvas viewer: https://doodle.7db.pw/
• Gallery: https://doodle.7db.pw/gallery.html
• Legacy gallery redirect: http://server1.rpgwo.org/

Features

• Real-time collaborative drawing with the 3DS touchscreen.
• Top-screen minimap with viewport marker.
• Zoom levels: 0.5x, 1x, 2x, and 4x.
• Named channels: main, sketch, and test.
• Channel switch UI on the 3DS.
• Color picker, color sampling, brush size/shape controls, and quick eraser.
• Color-square picker with hue strip and circle/box/dither/eraser brush modes.
• Device identity, display name, backup-code recovery, and connected-user list.
• Mod/admin canvas tools with snapshot, clear, and selection-style fill rectangle.
• Compressed canvas snapshots using zlib.
• Server update checks with manifest, size, and SHA-256 verification.
• App metadata/icon via SMDH, including the visible app version/build label.
• Optional .cia packaging when makerom.exe is installed.

Installation

Copy the .3dsx to the SD card, run it with the Homebrew Launcher.

Or send it with 3dslink while the Homebrew Launcher netloader is waiting:

3dslink -a <3ds-ip> -r 10 Doodle.3dsx

Controls

Touch bottom screen - Draw

Circle Pad - Pan viewport

Hold D-Pad Left or A+Drag stylus - Pan viewport

Hold L or R - Temporarily switch to eraser; release to return to the previous brush

Hold D-Pad Right - Show zoom buttons on the right side of the bottom screen

Hold Y - Show zoom buttons on the left side of the bottom screen

Hold D-Pad Right or Y+Tap [+] - Zoom in

Hold D-Pad Right or Y+Tap [-] - Zoom out

Start - Refresh canvas from server

Select - Open menu

Menu includes channels, connected users, controls, status, identity, admin tools, and exit

B or D-Pad Down - Toggle color picker

Color picker tabs - COLOR and MOD

MOD tab - Snapshot, clear canvas, and fill rectangle. Fill rectangle arms a selection; release stylus to fill using the selected color

Hold D-Pad Up or X+Tap canvas - Sample color

Screenshots

Changelog

v1.3.3

• Text chat has been removed so Collab Doodle can stay focused on shared drawing.
• What's new:
  • Added a dedicated eraser tool.
  • Hold L or R to temporarily switch to the eraser, then release to return to your previous brush.
  • Added Circle Pad panning support.
  • Improved the dither brush.
  • A random drawing color is chosen when the app starts.
  • Color sampling with Up or X now updates the color picker correctly.
  • Added better disconnect handling, including a popup when the app loses connection.
  • Updated the rules/tutorial flow and controls text.

v1.3.0

• New
  • Public chat is now available from the in-app menu.
  • New messages can play a soft notification sound.
  • Chat sound can be toggled on or off from the chat screen.
  • Recent chat messages load automatically when opening chat.
  • Long chat messages wrap better.
  • Chat messages can be reported from the 3DS.
  • The connected user list is now visible in chat.
  • Your name and identity now persist between launches.
• How to Use Chat
  • Press SELECT to open the menu.
  • Choose Chat.
  • Tap Send or press A to open the keyboard.
  • Type your message and confirm.
  • Use Up/Down to select older or newer messages.
  • Tap Report to report the selected message.
  • Use Sound On/Off to toggle chat notification sounds.
  • Only the most recent public chat messages are shown.
• Setting Your Identity
  • Press SELECT to open the menu.
  • Choose Identity.
  • Press A to change your display name.
  • Press Y to create or view your backup code.
  • Save your backup code somewhere safe.
  • Your backup code can be used later to recover your identity on another device.

v1.2.2

• What's New
  • Improved update checking so the app can find new versions more reliably.
  • Added support for updating older versions of the app during the server move.
  • Improved support for both .3dsx and .cia versions.
  • Added early account/identity support so moderation and safety features can work better.
  • General connection and compatibility improvements.
• About Identities
  • Collab Doodle now creates a simple identity for your 3DS. This helps the server remember who you are between launches and allows moderation tools to work properly if someone misuses the shared canvas.
  • You may also see or create a backup code. Keep this somewhere safe if you want to recover your identity later, such as after changing SD cards or using a different 3DS.

v1.2.0

• New bottom-screen tool palette with Color and Mod tabs.
• Color-square picker with hue strip.
• Circle, box, and dither brush modes.
• Cleaner mod/admin tools, including snapshot, clear canvas, and selection-style fill rectangle.
• Persistent 3DS identity with display names, backup codes, and account recovery.
• Connected-user list and improved top-screen status/menu flow.

v1.1.1

• Implemented zoom functionality!
• Zoom levels: 0.5x, 1x, 2x, and 4x.

v1.0.1

• Network Updates:
  • Updated backend connection code to support domains for server connection
  • Added some reconnect functionality

v1.0.0

• Initial release.

External links

GitHub - https://github.com/ArmstrongThomas/Doodle