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Decision fieldFree downloadSeamly2DGlobalRemoveOpen accessYarn Database EU Dyers and MakersEuropean UnionRemoveOpen accessKnitting Needle to Crochet Hook Size ChartGlobalRemove
Decision fit
Primary jobFind patterns & fitChoose materialsLearn techniques
Also useful forNo additional job recordedNo additional job recordedNo additional job recorded
AreaPatterns & fitYarnYarn
Best forDigital pattern draftingFinding independent EU yarn or fibre dyers with off-Ravelry purchase routesFinding the current CYC hook and needle aliases that share one known nominal metric diameter before confirming project gauge
Know before usingPatternmaking 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.It is one curator's intentionally selective, off-Ravelry-oriented database, inventories change, and paid supporters can receive rotating priority placement; verify availability, fibre claims, shipping, and terms directly.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
ForBothMakersMakers
Location or jurisdictionGlobalEuropean UnionGlobal
AccessFree downloadOpen accessOpen access
FormatSoftwareDirectoryStitch Authority
Source typeOpen-source projectCommunity databaseStitch Authority
Source and review
What the source establishesThe 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 individually researched database offers free listings and sortable yarn, fibre, designer, editor, accessory, and location views; the EU page spans multiple countries and direct seller profiles.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 15, 2026Jul 28, 2026
Next review dueJan 17, 2027Jan 11, 2027Jul 28, 2027
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