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Decision fieldOpen accessFreeSewingGlobalRemoveFree downloadSeamly2DGlobalRemoveOpen accessKnitting Needle to Crochet Hook Size ChartGlobalRemove
Decision fit
Primary jobFind patterns & fitFind patterns & fitLearn techniques
Also useful forNo additional job recordedNo additional job recordedNo additional job recorded
AreaPatterns & fitPatterns & fitYarn
Best forCustom-fit home sewing patternsDigital pattern draftingFinding the current CYC hook and needle aliases that share one known nominal metric diameter before confirming project gauge
Know before usingA generated pattern is not independent fit evidence or a production-ready graded block. The result still depends on accurate measurements, the selected design and options, ease assumptions, fabric behavior, construction, and representative test garments. An account stores saved patterns and measurement sets, so review the platform's privacy terms before retaining personal measurements.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
ForMakersBothMakers
Location or jurisdictionGlobalGlobalGlobal
AccessOpen accessFree downloadOpen access
FormatSoftwareSoftwareStitch Authority
Source typeOpen-source projectOpen-source projectStitch Authority
Source and review
What the source establishesFreeSewing's official documentation says the browser editor drafts a selected design in real time from a measurement set rather than scaling or grading a standard-size pattern. Users can adjust design options and export the generated result, including as PDF; saving the pattern to an account is optional and is used to revisit it later.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 reviewedJul 21, 2026Jul 21, 2026Jul 28, 2026
Next review dueJan 17, 2027Jan 17, 2027Jul 28, 2027
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