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| Decision field | Free accountThreadloop Sewing Pattern DatabaseGlobalRemove | Open accessHook & Needle Diameter ReferenceGlobalRemove | Free downloadSeamly2DGlobalRemove | Free + paidPattern TestersGlobalRemove |
|---|---|---|---|---|
| Decision fit | ||||
| Primary job | Find patterns & fit | Learn techniques | Find patterns & fit | Find patterns & fit |
| Area | Patterns & fit | Yarn | Patterns & fit | Patterns & fit |
| Best for | Searching current and out-of-print sewing patterns | Checking which U.S. alias the current Craft Yarn Council table gives a known metric package size before confirming project gauge | Digital pattern drafting | Coordinating an independent sewing-pattern test |
| Know before using | 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. | 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. | 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. | The interface and plan description do not prove tester reach, completion, feedback quality, fit validity, export quality, uptime, support, or suitability for an established release process. Measurements and photos can be sensitive personal data. Run a non-critical pilot, review the current privacy and service terms, define consent and photo rights, test exports and deletion, and keep pattern approval and release responsibility with the designer. |
| Practical access | ||||
| For | Makers | Makers | Both | Apparel brands |
| Location or jurisdiction | Global | Global | Global | Global |
| Access | Free account | Open access | Free download | Free + paid |
| Format | Community | Stitch Authority | Software | Software |
| Source type | Community database | Stitch Authority | Open-source project | First-party platform |
| Source and review | ||||
| What the source establishes | 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. | 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. | 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. | Pattern Testers currently offers application intake, tester selection, feedback, photos, approvals, issue tracking, revisions, a reusable tester directory, and release deadlines. The public pricing page shows a limited free plan and paid Pro and Business tiers. Its June 2026 privacy policy lists names, email addresses, measurements, photos, feedback, application history, and assignments among the data processed. |
| Linked page reviewed | Jul 21, 2026 | Jul 16, 2026 | Jul 21, 2026 | Jul 21, 2026 |
| Next review due | Jan 17, 2027 | Jul 16, 2027 | Jan 17, 2027 | Jan 17, 2027 |
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