PartDesigner

The application provides a macOS‑based environment for creating custom LEGO components. Users can draw, edit, and assemble shapes that conform to LEGO’s geometry, allowing them to prototype new bricks, plates, and specialized pieces. The tool includes functionality for exporting designs in formats compatible with BrickLink, facilitating sharing or ordering of the parts parts.

Targeted at hobbyists, designers, and LEGO enthusiasts who wish to extend the official set catalog, the software supports precise measurements and snap‑to‑grid controls that match the dimensions of existing LEGO elements. It also offers a preview mode that visualizes the finished part from multiple angles, helping users assess fit and aesthetics before finalizing a design.

The program is released as a stable version for macOS, with direct download links provided on its homepage. It runs locally, requiring no external services beyond optional connections to BrickLink for part distribution.