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| Decision field | Free downloadSeamly2DGlobalRemove | Open accessSeam Allowance ConverterGlobalRemove |
|---|---|---|
| Decision fit | ||
| Primary job | Find patterns & fit | Find patterns & fit |
| Area | Patterns & fit | Patterns & fit |
| Best for | Digital pattern drafting | Working between pattern systems |
| Know before using | Patternmaking knowledge, controlled measurement files, production conventions, and sewn fit testing are still required. The software does not validate body measurements, ease, balance, grading rules, fabric behavior, construction, or product fit. The project currently labels its user wiki manual as needing updates, so confirm current commands and file behavior against the installed release and active support channels. | A unit reference; the correct allowance depends on material, seam type, and production method. |
| Practical access | ||
| For | Both | Both |
| Location or jurisdiction | Global | Global |
| Access | Free download | Open access |
| Format | Software | Stitch Authority |
| Source type | Open-source project | Stitch Authority |
| Source and review | ||
| What the source establishes | The maintained Seamly2D repository identifies the application as GPLv3+ open-source patternmaking software for Windows, macOS, and Linux. It reads multi-size measurement files for standardized sizes and individual measurement files for custom-fit work, publishes downloadable builds and releases, and links an active website and user forum. | The linked tool or guide is maintained inside Stitch Authority and was checked against its current public interface. |
| Linked page reviewed | Jul 21, 2026 | Jul 15, 2026 |
| Next review due | Jan 17, 2027 | Jul 15, 2027 |
| Inspect | ||
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