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| Decision field | Free downloadSeamly2DGlobalRemove | Open accessHook & Needle Diameter ReferenceGlobalRemove | Open accessYarnSubGlobalRemove | Open accessApparel Grade-Rule & Size-Run Validation RecordGlobalRemove |
|---|---|---|---|---|
| Decision fit | ||||
| Primary job | Find patterns & fit | Learn techniques | Choose materials | Find patterns & fit |
| Area | Patterns & fit | Yarn | Yarn | Patterns & fit |
| Best for | Digital pattern drafting | Checking which U.S. alias the current Craft Yarn Council table gives a known metric package size before confirming project gauge | Replacing a discontinued or unavailable yarn | Auditing inherited grade rules or controlling a new multi-size pattern release from approved targets through sample evidence |
| 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 reference is not a dimensional measurement, manufacturer inspection, UK or Canadian conversion, steel-hook chart, tool recommendation, yarn assignment, gauge result, or proof that a proposed tool will produce the required fabric. | A suggested match is a data-based shortlist, not proof that the yarn suits the pattern or maker. Yarn records can be incomplete or wrong, prices and availability vary by market, and the site uses affiliate links. Confirm the required gauge, total length, fibre behavior, construction, care, color, dye lot, accessibility, and seller terms, then make and assess a representative swatch before committing. | The record does not create a production grade, supply universal increments or breakpoints, validate a CAD file or fit population, reproduce licensed standards, or replace qualified anthropometric, pattern, technical-design, fit, quality, accessibility, safety, statistical, and user-research review. |
| Practical access | ||||
| For | Both | Makers | Makers | Apparel brands |
| Location or jurisdiction | Global | Global | Global | Global |
| Access | Free download | Open access | Open access | Open access |
| Format | Software | Stitch Authority | Reference | Stitch Authority |
| Source type | Open-source project | Stitch Authority | First-party platform | 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 lookup reproduces the current public Craft Yarn Council metric and U.S. alias rows and follows the Council's warning that company letter and number labels vary; blank aliases remain blank instead of being inferred. | YarnSub's official FAQ says its matching software compares gauge, texture, yarn weight and density, fibre content, and fibre qualities such as drape and softness. Discontinued yarns remain searchable as starting points but are excluded from suggested replacements, and each yarn page provides a route to report source-data problems. | The guide cites current ISO body-table, size-designation, and garment-measurement boundaries plus two peer-reviewed studies that tested the relationship between conventional grade rules, anthropometric evidence, and garment fit; it requires product-specific target deltas and validation instead of publishing universal increments. |
| Linked page reviewed | Jul 21, 2026 | Jul 16, 2026 | Jul 21, 2026 | Jul 16, 2026 |
| Next review due | Jan 17, 2027 | Jul 16, 2027 | Jan 17, 2027 | Jul 16, 2027 |
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