Litematica vs SchemViewer

Litematica is a free client-side mod for Minecraft that adds tools for working with schematic builds. Users can load schematic files, create placements, and save selected areas as schematics. Placements can be moved or rotated, and a render-layer view can show a chosen block layer. Edit Schematic mode supports replacing, adding, and removing blocks; other creative tools include cloning, filling, and deleting areas. Supported formats include Litematica .litematic, Sponge .schem, vanilla structure .nbt, and MCEdit/Schematica .schematic. Litematica requires the malilib library mod; the project says Fabric API is not needed. Its repository describes versions for LiteLoader on Minecraft 1.12.2, an earlier Rift port for 1.13.2, Fabric for 1.14 and later, and Forge for 1.12.2. Schematic pasting uses commands and requires sufficient permission, so server use depends on authorization. Schematics saved from typical multiplayer servers may lack inventory and other NBT data. The project wiki provides documentation and usage tips.

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.