Search the Ravelry pattern database by keyword and filters: craft, category, yarn weight, yardage, difficulty, fit, techniques and construction (attributes), language, designer and price. Returns a page of matches; call get_pattern_details with the ids for yarn, gauge, needles and notes.

Get full details for one or more Ravelry patterns by id: designer, price, difficulty, rating, yarn weight, yardage, gauge, needle/hook sizes, sizes, techniques, crochet terminology (US/UK), and the designer notes.

Search the Ravelry yarn database by name, weight, fiber and attributes (superwash, hand-dyed, self-striping...). Excludes discontinued yarns unless asked. Returns yardage and grams per skein, washability and rating for each match.

Get full details for one or more yarns by id: fiber content, recommended needles and hooks, gauge, care, texture, color/dye attributes, where it is made, and notes.

Yarn substitution: lists the yarns other Ravelry users actually used to make a pattern, ranked by how many projects used each one, next to the yarn weight, yardage and gauge the pattern calls for and the yarns its designer suggested.

Finds the Ravelry yarn behind text read from a ball band, receipt or invoice. Pass one item per yarn with the raw label plus whatever you could read (brand, name, weight, fiber, yards/meters and grams per skein). Returns the best match with a confidence and alternatives; use the yarn ids with add_to_my_stash or get_yarn_details.

Find local yarn shops from Ravelry's shop directory, either around a point (latitude/longitude + radius, nearest first) or by shop name or city. For "near me" or "in ", prefer coordinates: use the coordinates of the place the user names.

Compares the user's swatch with a pattern's gauge: whether to change needles, how big the piece comes out if they follow the pattern as written, and pattern numbers (cast-on, stitch counts, rows) recalculated for their gauge so the size stays right. Give the pattern gauge, or a pattern_id to read it from Ravelry.

Spaces increases or decreases evenly across a row or round, e.g. "increase 13 stitches evenly across 97": returns the exact written instruction. Knitting uses M1 / k2tog, crochet uses 2 sts in one / sc2tog.

Works out how many skeins to buy for a pattern with a given yarn, with a safety margin. Reads the yardage from a Ravelry pattern (smallest and largest size) and the skein length from a Ravelry yarn, or takes the numbers directly. Can account for a gauge difference or a bigger size (scale).

Reads written knitting or crochet instructions row by row ("*k2, p2; rep from * to last 2 sts, k2", "(sc, inc) x 6 (18)") and counts the stitches each step uses and makes. Flags rows that do not use every stitch and counts that differ from the one printed in the pattern. Use it to walk someone through a row or to check a pattern for errors.

Converts an amount of yarn between grams and length (meters/yards) and skeins, e.g. "I have 200 g of Rios" or "how many grams is 300 m of DK?". Uses the yarn's own skein data (yarn_id) when given, else a typical ratio for the yarn weight (an estimate). Yarn is sold by weight in much of the world, but patterns need a length.

Reference tables: needle and hook sizes (metric, US, UK, Japanese), yarn weights across regions (US worsted = UK aran = AU 10 ply, with typical needles and gauge), US↔UK crochet and knitting terms (UK "dc" is US "sc"!), and standard abbreviations. Use lookup to find one entry, e.g. "4mm", "US 8", "H", "DK", "8 ply", "ssk", "htr".