Seamly2D vs Valentina

Seamly2D is free, open-source fashion design software for creating garment patterns on Windows, Linux, and MacOS. Its pattern workflow supports adapting earlier designs and working with size charts, made-to-measure data, and converted body scans. The site lists apparel, costumes, athletic wear, pet gear, outdoor products, and upholstery as possible applications. Seamly describes a process extending from design through manufacturing for physical and digital products, and says its software integrates 2D, 3D, and Mixed Reality. A beta process described for 3DLOOK MOBILE TAILOR measurements converts CSV files into Seamly measurement files by email. The download process asks for a name, email, operating system, and intended use before emailing a download link. The download page says Seamly Systems does not sell or share the personal information it holds. A user forum is available for software discussion. Seamly2D includes 2D pattern making and size grading, with SVG listed as an export format.

Valentina is clothing-pattern software for building and modeling patterns, with an emphasis on parametric sizing. Measurements, increments, formulas, and construction rules can be used to rearrange patterns. It supports 2D pattern making and size grading, and exports SVG, PDF, PNG, OBJ, PS, EPS, and DXF. The software runs on Linux, macOS, and Windows. Stable downloads list an AppImage for Linux, Windows 7+ 32-bit and Windows 10+ 64-bit packages, and macOS packages for Intel, Apple Silicon, and Universal systems. Valentina is GPLv3+ licensed, and its FAQ says there are no restrictions on the kind of work made with it. It supports.val files from Seamly2D, though the reverse compatibility is not supported; DXF import is unavailable. The Free plan is free and includes source code access, historical versions, and community support, but no current binaries, manual, or developer support. Basic is €8.26 a month and Premium is €16.51 a month.