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| Decision field | Free downloadSeamly2DGlobalRemove | Open accessTech Pack Definition, Contents & LimitsGlobalRemove | PaidPatternLab LondonGlobalRemove |
|---|---|---|---|
| Decision fit | |||
| Primary job | Find patterns & fit | Source production | Find patterns & fit |
| Also useful for | No additional job recorded | No additional job recorded | No additional job recorded |
| Area | Patterns & fit | Production | Patterns & fit |
| Best for | Digital pattern drafting | Understanding what a tech pack must control before using a template or releasing work | Generating an editable custom-measurement block |
| 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. | An orientation rather than a completed product record; it does not supply a universal format, licensed standard content, measurements, tolerances, construction settings, labels, approvals, compliance conclusion, or product-release authority. | A measurement-generated draft is a starting block, not independent evidence of body capture, comfort, mobility, balance, garment ease, or production fit. The result depends on measurement accuracy, supported ranges, formula assumptions, selected options, and output handling. Review the service's privacy terms before storing body data and sew a representative toile before design, grading, or production use. |
| Practical access | |||
| For | Both | Apparel brands | Both |
| Location or jurisdiction | Global | Global | Global |
| Access | Free download | Open access | Paid |
| Format | Software | Stitch Authority | Software |
| Source type | Open-source project | Stitch Authority | First-party platform |
| 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 guide cites published ISO sources for documented-information, garment-measurement, stitch, and seam boundaries plus current U.S. FTC textile and care-labeling guidance; it discloses that ISO 10013:2021's 2026 systematic review is at close-of-review stage and separates every cited authority from product-specific technical and market decisions. | PatternLab London's current drafting page says a user creates a measurement profile, selects a basic block or sloper, adjusts fit, dart placement, length, seam allowance, and sleeve options, then downloads the generated result as tiled PDF, AI, or SVG. The live catalogue names bodice, dress, trouser, and stretch blocks and displays a price before purchase. |
| Linked page reviewed | Jul 21, 2026 | Jul 27, 2026 | Jul 21, 2026 |
| Next review due | Jan 17, 2027 | Jul 27, 2027 | Jan 17, 2027 |
| Inspect | |||
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