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Compare textile resources.
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| Decision field | Open accessKnitting Needle to Crochet Hook Size ChartGlobalRemove | Open accessPattern Grading & Size-Run Validation RecordGlobalRemove | Open accessSample Review & Approval RecordGlobalRemove | Free downloadSeamly2DGlobalRemove |
|---|---|---|---|---|
| Decision fit | ||||
| Primary job | Learn techniques | 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 | Yarn | Patterns & fit | Production | Patterns & fit |
| Best for | Finding the current CYC hook and needle aliases that share one known nominal metric diameter before confirming project gauge | Auditing inherited grade rules or controlling a new multi-size pattern release from approved targets through sample evidence | Approving a named sample without accidentally approving bulk | Digital pattern drafting |
| Know before using | 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. | 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. | The record does not validate every size or user, prove bulk conformity, prescribe universal defect classes or AQL, replace testing or inspection, or establish compliance. | 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. |
| Practical access | ||||
| For | Makers | Apparel brands | Apparel brands | Both |
| Location or jurisdiction | Global | Global | Global | Global |
| Access | Open access | Open access | Open access | Free download |
| Format | Stitch Authority | Stitch Authority | Stitch Authority | Software |
| Source type | Stitch Authority | Stitch Authority | Stitch Authority | Open-source project |
| Source and review | ||||
| What the source establishes | 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. | 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. | The record applies version and lot controls from textile testing plus current ISO and ASQ acceptance-sampling boundaries to separate sample approval from bulk release. | 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. |
| Linked page reviewed | Jul 28, 2026 | Jul 27, 2026 | Jul 15, 2026 | Jul 21, 2026 |
| Next review due | Jul 28, 2027 | Jul 27, 2027 | Jul 15, 2027 | Jan 17, 2027 |
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