Seamly2D review
A free 2D patternmaking tool for custom fit, multisize grading, and SVG workflows.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Seamly2D is open-source 2D patternmaking software for fashion designers, patternmakers, and fashion agencies. It supports standardized multisize measurement files for graded patterns and individual measurement files for custom-fit work. Users can draft patterns, create pattern pieces and layouts, resize designs, and export pattern layouts through SVG workflows. Its stated applications include apparel, costumes, athletic wear, pet gear, outdoor products, and upholstery, making it relevant to both fashion-focused and specialty product workflows.
The strongest fit is for users who want a free, open-source tool across Windows, macOS, and Linux. Its measurement approach covers two important use cases: standardized sizes for repeatable grading and individual measurements for custom-fit patterns. Pattern piece and layout creation keep the workflow focused on core 2D construction tasks, while resizing supports adjustments based on either individual or multisize measurements. SVG export also gives users a defined path for moving pattern layouts into SVG-based workflows.
Seamly2D is less suited to teams seeking the broader feature coverage of paid production suites. Its verified scope centers on 2D patternmaking, resizing, layouts, and SVG export, while 3D garment simulation is not established as a Seamly2D feature. Choose it when open-source access, measurement flexibility, multiplatform availability, and core pattern drafting matter most. Consider an alternative when the workflow depends on verified 3D simulation or a wider production-focused feature set.
Seamly2D pros and cons
- Where it wins
- Free and open source for Windows, macOS, and Linux
- Supports custom-fit and standardized multisize measurement files
- Creates layouts, resizes patterns, and supports SVG export workflows
- Where it doesn't
- Its verified feature set is narrower than paid production suites
- The product focus is 2D patternmaking rather than verified 3D simulation
- SVG is the listed export format
Seamly2D fact sheet, pricing and score →
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
Last updated · How we research and update