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| Decision field | Open accessSeam Allowance ConverterGlobalRemove | Free accountThreadloop Sewing Pattern DatabaseGlobalRemove | Free downloadSeamly2DGlobalRemove | Free + paidPattern TestersGlobalRemove |
|---|---|---|---|---|
| Decision fit | ||||
| Primary job | Find patterns & fit | Find patterns & fit | Find patterns & fit | Find patterns & fit |
| Area | Patterns & fit | Patterns & fit | Patterns & fit | Patterns & fit |
| Best for | Working between pattern systems | Searching current and out-of-print sewing patterns | Digital pattern drafting | Coordinating an independent sewing-pattern test |
| Know before using | A unit reference; the correct allowance depends on material, seam type, and production method. | 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. | 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 | Both | Makers | Both | Apparel brands |
| Location or jurisdiction | Global | Global | Global | Global |
| Access | Open access | Free account | Free download | Free + paid |
| Format | Stitch Authority | Community | Software | Software |
| Source type | Stitch Authority | Community database | Open-source project | First-party platform |
| Source and review | ||||
| What the source establishes | The linked tool or guide is maintained inside Stitch Authority and was checked against its current public interface. | 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 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 15, 2026 | Jul 21, 2026 | Jul 21, 2026 | Jul 21, 2026 |
| Next review due | Jul 15, 2027 | Jan 17, 2027 | Jan 17, 2027 | Jan 17, 2027 |
| Inspect | ||||
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