Seamly2D

About

Seamly2D is a free, open-source apparel CAD app that can be downloaded for MacOS, as well as Windows and Linux. The website describes it as a tool for building patterns, with size charts, made-to-measure data, and body scan conversion to help garments fit better. Designers can adapt previous designs to meet current needs, and the software is positioned for uses including apparel, costumes, athletic wear, pet gear, outdoor products, and upholstery.

User feedback on the website praises the software for developing everything from basic slopers to patterns made to specific measurements. One reviewer notes that patterns can be built quickly or constructed with formulas to proportionally reuse a fit across different measurements. The project's news posts also describe ongoing development, including a recently added Duplicate a Draft Block feature and regular contributions from the open-source community.

Seamly is presented as free and open-source software that is used in both research and industry. The website frames its mission around making fashion design more accessible and sustainable, with the goal of helping garments fit better from the start.