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| Decision field | Free downloadSeamly2DGlobalRemove | Open accessKnitting Needle to Crochet Hook Size ChartGlobalRemove |
|---|---|---|
| Decision fit | ||
| Primary job | Find patterns & fit | Learn techniques |
| Also useful for | No additional job recorded | No additional job recorded |
| Area | Patterns & fit | Yarn |
| Best for | Digital pattern drafting | Finding the current CYC hook and needle aliases that share one known nominal metric diameter before confirming project gauge |
| 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 shared nominal diameter does not make a knitting needle and crochet hook interchangeable or predict equal gauge or fabric. The reference is not a physical measurement, manufacturer inspection, UK or Canadian conversion, steel-hook chart, tool recommendation, yarn assignment, or project approval. |
| Practical access | ||
| For | Both | Makers |
| 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. | Rechecked July 28, 2026. The lookup reproduces the current public Craft Yarn Council metric and U.S. alias rows, aligns hooks and needles only when their nominal millimetre value matches, and leaves missing rows or aliases unfilled. |
| Linked page reviewed | Jul 21, 2026 | Jul 28, 2026 |
| Next review due | Jan 17, 2027 | Jul 28, 2027 |
| Inspect | ||
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