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Decision fieldFree downloadSeamly2DGlobalRemoveFree accountThreadloop Sewing Pattern DatabaseGlobalRemovePaidPatternLab LondonGlobalRemove
Decision fit
Primary jobFind patterns & fitFind patterns & fitFind patterns & fit
AreaPatterns & fitPatterns & fitPatterns & fit
Best forDigital pattern draftingSearching current and out-of-print sewing patternsGenerating an editable custom-measurement block
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.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.A measurement-generated draft is a starting block, not independent evidence of body capture, comfort, mobility, balance, garment ease, or production fit. The result depends on measurement accuracy, supported ranges, formula assumptions, selected options, and output handling. Review the service's privacy terms before storing body data and sew a representative toile before design, grading, or production use.
Practical access
ForBothMakersBoth
Location or jurisdictionGlobalGlobalGlobal
AccessFree downloadFree accountPaid
FormatSoftwareCommunitySoftware
Source typeOpen-source projectCommunity databaseFirst-party platform
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.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.PatternLab London's current drafting page says a user creates a measurement profile, selects a basic block or sloper, adjusts fit, dart placement, length, seam allowance, and sleeve options, then downloads the generated result as tiled PDF, AI, or SVG. The live catalogue names bodice, dress, trouser, and stretch blocks and displays a price before purchase.
Linked page reviewedJul 21, 2026Jul 21, 2026Jul 21, 2026
Next review dueJan 17, 2027Jan 17, 2027Jan 17, 2027
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