PatternPlot: Trace & Grade

Deterministic, garment-aware grading. Grade one size into the full run, with honest QA checks. AI never touches your measurements. 7-day free Pro trial.

PatternPlot turns a paper sewing pattern into an editable, true-scale vector on your iPad — then grades one base size into a full size run, deterministically.

Tracing a pattern got easy years ago. Grading — turning one size into a trustworthy run of sizes — is still the hard, trust-sensitive job. PatternPlot is built around that job, on device, with geometry you can audit.

FREE — real work, no subscription • Photograph or import a paper pattern and trace it with Apple Pencil (or finger + numeric entry). • Edit true-scale vector pieces: add seam allowance, notches, and grainlines. • Export true-scale tiled PDFs and A0 — with a 50 mm calibration square and registration marks so your print is exactly to scale. No purchase is required to do any of this. Basic export is never locked behind a paywall.

PRO GRADING — the paid tier • Deterministic full-size-run grading from one traced base size. • A nested-grade overlay that stacks every size — projector- and print-friendly. • Grade-rule starter tables: editable starting points you tune to your own drafting, not a fixed size library. • A deterministic QA report that walks every mating seam and flags likely errors before you cut.

HONEST BY DESIGN The grade is deterministic geometry computed on your device. AI never touches your measurements. When AI advisory is available, it only turns a plain-English request into grading parameters that are re-checked on device — it can never move a point, a seam allowance, or a graded measurement.

PatternPlot also tells you when a size drifts beyond a safe grade range, so you can re-check proportions before cutting fabric. We describe this as garment-aware grading — not a fit guarantee.

REQUIRES: iPad on iPadOS 17 or later. Apple Pencil recommended but not required.

— Pro Grading subscription: $79.99/year after a 7-day free trial. Payment is charged to your Apple ID at confirmation of purchase. It renews automatically unless turned off at least 24 hours before the end of the period; manage or cancel anytime in your Apple ID Account Settings. Trace, vector edit, seam allowance, notches, grainline, and tiled/A0 PDF export are free and do not require a subscription.

Privacy Policy: https://amtyurin.github.io/patternplot/privacy-policy.html Terms of Use: https://amtyurin.github.io/patternplot/terms-of-use.html