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| Decision field | Free + paidThreadloop Sewing Pattern DatabaseGlobalRemove | Open accessPattern Grading & Size-Run Validation RecordGlobalRemove | Open accessSeam Allowance ConverterGlobalRemove | Open accessKnitting Needle to Crochet Hook Size ChartGlobalRemove |
|---|---|---|---|---|
| Decision fit | ||||
| Primary job | Find patterns & fit | Find patterns & fit | Find patterns & fit | Learn techniques |
| Also useful for | No additional job recorded | No additional job recorded | No additional job recorded | No additional job recorded |
| Area | Patterns & fit | Patterns & fit | Patterns & fit | Yarn |
| Best for | Searching current and out-of-print sewing patterns | Auditing inherited grade rules or controlling a new multi-size pattern release from approved targets through sample evidence | Translating a seam allowance already stated by a pattern or controlled specification | Finding the current CYC hook and needle aliases that share one known nominal metric diameter before confirming project gauge |
| 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 record does not create a production grade, supply universal increments or breakpoints, validate a CAD file or fit population, reproduce licensed standards, or replace qualified anthropometric, pattern, technical-design, fit, quality, accessibility, safety, statistical, and user-research review. | This is a unit-translation reference. It does not select, approve, or change a seam allowance; establish a universal fraction; interpret an unstated cutting or stitching line; or replace the exact pattern version, controlled specification, material and seam evidence, sample, production method, equipment, tolerance, or release authority. | 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 | ||||
| For | Makers | Apparel brands | Both | Makers |
| Location or jurisdiction | Global | Global | Global | Global |
| Access | Free + paid | Open access | Open access | Open access |
| Format | Community | Stitch Authority | Stitch Authority | Stitch Authority |
| Source type | Community database | Stitch Authority | Stitch Authority | Stitch Authority |
| Account, payment, and exit | ||||
| Access scope | Sewer searching pattern records or organizing patterns, projects, fabric, notions, and private files. | Not yet reviewed at this level. | Not yet reviewed at this level. | Not yet reviewed at this level. |
| Before an account | Browse the pattern database, guide, designers, publications, and public community areas without creating an account. | Not yet reviewed at this level. | Not yet reviewed at this level. | Not yet reviewed at this level. |
| Free-account boundary | A free account needs no card and supports a stash, wishlist, projects, reviews, and personal organization. | Not yet reviewed at this level. | Not yet reviewed at this level. | Not yet reviewed at this level. |
| Payment boundary | Plus adds PDF pattern storage, collections, saved searches, bulk editing, and other workflow features on monthly or annual billing. | Not yet reviewed at this level. | Not yet reviewed at this level. | Not yet reviewed at this level. |
| Cancellation or exit | Cancel through an in-account link. Paid features remain through the current billing cycle, then the account returns to free features. | Not yet reviewed at this level. | Not yet reviewed at this level. | Not yet reviewed at this level. |
| Saved work and data | The terms say submitted materials remain yours, but the checked public pages do not explain a full export or how stored PDFs behave after downgrade. Keep originals outside the platform. | Not yet reviewed at this level. | Not yet reviewed at this level. | Not yet reviewed at this level. |
| 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. Current terms state that the free plan requires no card, paid upgrades start billing immediately, cancellation retains paid features through the current cycle, and the account then returns to free features. | The guide cites current ISO body-table, size-designation, and garment-measurement boundaries plus two peer-reviewed studies that tested the relationship between conventional grade rules, anthropometric evidence, and garment fit; it requires product-specific target deltas and validation instead of publishing universal increments. | NIST states that one inch is exactly 25.4 millimetres, and the SI decimal relationship makes one centimetre equal to 10 millimetres. The tool uses those factors, displays rounded equivalents, exposes the size difference to the nearest 1/16 inch when converting to inches, and preserves valid value, source-unit, and target-unit state in the URL. | 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 reviewed | Jul 28, 2026 | Jul 27, 2026 | Jul 28, 2026 | Jul 28, 2026 |
| Next review due | Jan 24, 2027 | Jul 27, 2027 | Jul 28, 2027 | Jul 28, 2027 |
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