Check the pattern before you spend twenty hours on it
Paste a crochet pattern and see in seconds whether every round adds up. Free, no signup, and the pattern never leaves your browser.
Reads standard US round notation. Nothing you paste is uploaded or stored.
The most expensive way to find an error is with a hook in your hand
A wrong count in round 12 does not announce itself. It shows up two evenings later as a head that will not close, and by then the yarn, the hours, and the patience are already spent. The math could have been checked in seconds, before any of it.
Counts, recomputed
Each round's operations are added up independently and compared with the count the pattern declares. "(2 sc, inc) x 6" makes 24, and if the line says 26, you will see both numbers.
Physically impossible rounds
A round can at most double or halve. A jump from 22 to 60 stitches cannot be crocheted no matter what the text around it says, and this is caught even when the round's operations cannot be parsed.
Round-to-round consistency
What a round consumes has to exist in the round before it. Six decreases need twelve stitches to eat; if the previous round left eight, something is wrong before you reach it.
Missing essentials
Gauge, hook size, yarn, assembly, finishing. A pattern can be arithmetically perfect and still leave you stranded at sewing time.
Nothing leaves your browser
The whole check runs on your device. Pasting a pattern here is not sharing it with anyone, including us.
Evidence, not opinions
Every finding shows the arithmetic behind it, with line numbers. "Trust me, it is broken" is worth nothing; "round 5 states 60 but 26 can grow to at most 52" is worth everything.
What it does not do
It does not judge taste, guess who wrote a pattern, or promise that a passing pattern is a pleasure to follow. It checks one thing, whether the instructions can be worked as written, and shows the arithmetic behind every finding so you can verify it yourself with nothing more than a pencil.
It reads standard US notation in English today. A pattern in another language or in chart form comes back as unreadable rather than wrongly judged.
Questions about the pattern check
What does the checker actually verify?
Arithmetic. Every round in a crochet pattern implies a stitch count: increases add, decreases remove, plain stitches carry over. The checker reads each round, computes what the operations produce, and compares that with the count the pattern states. It also knows a physical limit: a round can at most double or halve its stitches, so a round of 22 followed by a round of 60 cannot be worked no matter how it is written. On top of the math it looks for missing essentials such as gauge, hook size, yarn, and assembly notes.
Does my pattern get uploaded anywhere?
No. The check runs entirely inside your browser. Nothing is sent to a server, nothing is stored, and nobody at Amigurumake can see what you pasted. You can disconnect from the internet after the page loads and it will still work.
Can it tell who or what wrote a pattern?
No, and it does not try. It checks whether the instructions can be worked as written, not where they came from. A human-written pattern with a typo in round 12 and a machine-generated one with impossible counts fail the same way: the math does not add up. What you do with the result, keep crocheting, contact the seller, or request a refund, stays your call.
The report says "unreadable". Is my pattern bad?
Not at all. It means the checker could not find at least three rounds written in standard US notation, so it says nothing rather than guessing. Patterns written in other languages, in chart form, or in an unusual notation come back unreadable today. Silent is better than wrong.
A pattern passed. Does that mean it is good?
It means the stitch math is consistent, which is the failure mode that wastes the most hours. It cannot judge whether the finished toy is cute, whether the instructions are pleasant to follow, or whether the photos match the result. Consistent math is the floor, not the ceiling.
I sell patterns. Can I use this before publishing?
That is one of the best uses. Run the draft before it goes to testers, and they can spend their time on wording and construction instead of catching a count that a machine can catch. Inside the Amigurumake studio the same check runs automatically on every imported pattern.
Writing patterns of your own?
Inside Amigurumake this check runs automatically on every imported pattern, and the studio around it writes, previews in 3D, translates, and exports the PDF you sell.
Also worth reading: how to validate a crochet pattern before you sell