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Decision fieldFree downloadSeamly2DGlobalRemoveOpen accessHook & Needle Diameter ReferenceGlobalRemoveFree accountThreadloop Sewing Pattern DatabaseGlobalRemove
Decision fit
Primary jobFind patterns & fitLearn techniquesFind patterns & fit
AreaPatterns & fitYarnPatterns & fit
Best forDigital pattern draftingChecking which U.S. alias the current Craft Yarn Council table gives a known metric package size before confirming project gaugeSearching current and out-of-print sewing patterns
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.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.Community members add and quality-control the records, so confirm sizing, measurements, fabric suggestions, format, availability, errata, license, and purchase terms with the designer or publisher. Adding an entry to a stash does not provide the pattern files. Saved searches and private PDF storage are paid Plus features, and a listing or review does not establish pattern accuracy or fit.
Practical access
ForBothMakersMakers
Location or jurisdictionGlobalGlobalGlobal
AccessFree downloadOpen accessFree account
FormatSoftwareStitch AuthorityCommunity
Source typeOpen-source projectStitch AuthorityCommunity database
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 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.Threadloop's official guide describes an independent, fully crowdsourced database covering available and out-of-print sewing patterns. Its search supports pattern type, fabric type, age group, body type, cup size, level, format, file features, language, measurements, availability, and other filters; members can also track a stash, wishlist, projects, reviews, and discussions.
Linked page reviewedJul 21, 2026Jul 16, 2026Jul 21, 2026
Next review dueJan 17, 2027Jul 16, 2027Jan 17, 2027
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