MagicalChalk vs SchemViewer

MagicalChalk is a Minecraft mod for creating, importing, exporting and placing structures in Minecraft Java Edition 1.21.1 with NeoForge 21.1.x. It supports single-player, LAN and server play, including dedicated servers. Structure Chalk lets players mark an area by clicking two corners and save it to the server’s world storage. A selected blueprint can then be placed in-game with Magical Chalk, replacing obstacles. The mod works with .chalk, .json and .nbt files and converts .litematic, .schem and vanilla structure .nbt files. Its import manager can search files and show metadata such as dimensions, volume, block count and file size. Magic Chalk Studio provides placement, brush, line, shape, selection, paste and erase tools, with undo and redo shortcuts. A public API lets other mods register structures and associate them with biomes using JSON or Java. LuckPerms is optional; without it, most admin actions require OP level 2 by default. The interface is translated into English and French. MagicalChalk is free and MIT licensed.

SchemViewer is a free browser-based 3D viewer for Minecraft .litematic schematic files. It uses the Deepslate WebGL engine for interactive viewing, with controls to rotate, zoom and pan. A Y-axis slicer changes the visible height to inspect schematic layers, while region controls show or hide individual subregions and their bounding boxes. The searchable materials checklist supports filtering and checking off blocks. Technical mode switches between default Minecraft textures and customized technical textures. Users can export block lists and metadata as CSV or JSON; the placement workflow is export-only. The maker says files are processed offline in the browser and are not uploaded to a server. A Canvas 2D renderer provides a fallback to the WebGL viewer. The listed format is .litematic, and listed platforms include web, Linux, macOS and Windows. The project is licensed under MIT. For local use, the README describes cloning the repository and opening index.html in a web browser.