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| Decision field | Free downloadSeamly2DGlobalRemove | Open accessPattern Test Brief TemplateGlobalRemove | Open accessTech Pack Definition, Contents & LimitsGlobalRemove | Open accessSewing Length ConverterGlobalRemove |
|---|---|---|---|---|
| Decision fit | ||||
| Primary job | Find patterns & fit | Find patterns & fit | Source production | Find patterns & fit |
| Also useful for | No additional job recorded | No additional job recorded | No additional job recorded | No additional job recorded |
| Area | Patterns & fit | Patterns & fit | Production | Patterns & fit |
| Best for | Digital pattern drafting | Planning a sewing, knitting, or crochet pattern test | Understanding what a tech pack must control before using a template or releasing work | Translating a length already stated by a pattern, controlled specification, sewing tool, or seam allowance |
| 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. | The workflow is not a contract or quality certification; local legal duties and technical review may still apply. | 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. | This is a length-unit translation reference. It does not identify the measured feature; select, approve, or change a seam allowance; establish a universal fraction; interpret an unstated cutting or stitching line; or replace the exact pattern version, controlled specification, material and seam evidence, sample, production method, equipment, tolerance, or release authority. |
| Practical access | ||||
| For | Both | Both | Apparel brands | Both |
| Location or jurisdiction | Global | Global | Global | Global |
| Access | Free download | Open access | Open access | Open access |
| Format | Software | Stitch Authority | Stitch Authority | Stitch Authority |
| Source type | Open-source project | Stitch Authority | Stitch Authority | 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. | 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. | NIST states that 10 millimetres equal 1 centimetre and that one inch is exactly 25.4 millimetres. The tool uses those relationships, displays rounded equivalents, exposes the size difference to the nearest 1/16 inch when converting to inches, and preserves valid value, source-unit, and target-unit state in the URL. |
| Linked page reviewed | Jul 21, 2026 | Jul 15, 2026 | Jul 27, 2026 | Jul 30, 2026 |
| Next review due | Jan 17, 2027 | Jul 15, 2027 | Jul 27, 2027 | Jul 30, 2027 |
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