PatternPlot: Trace & Grade
Sewing pattern grading
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
iPad
New: check every seam and its notches across your whole size run, and carry grade corrections to your next garment. Deterministic, on device. 7-day free Pro trial.
PatternPlot turns a paper sewing pattern into an editable, true-scale vector on your iPad — then grades it into a full size run you define, 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).
• Import your own vector artwork (SVG) at true scale — free, because it is how you get your work in.
• Edit true-scale vector pieces: add seam allowance per edge, 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.
• Grade YOUR piece: mark a reference point and an axis, type how much each size grows, and see the whole run nested on screen.
• A quality report on every graded size: drift beyond the safe grade range, collapsed edges, and self-intersections.
• Export the base size — the size you drafted — at any time.
No purchase is required to do any of this. Basic export is never locked behind a paywall.
PRO GRADING — the paid tier
• A tiled PDF for every size in your run.
• A vector outline of every piece at every size.
• A nest of the whole run on one sheet.
• Every piece of the garment in each file, not just one.
• A spreadsheet of what every declared seam measured, size by size.
• Your grade corrections saved to a file, so another garment can use them.
The vector files carry the stitching outline only — no seam allowance, notches or grainline.
Reading a saved corrections file back into a pattern is free; only writing one is Pro.
HONEST BY DESIGN
The grade is deterministic geometry computed on your device. AI never touches your measurements: no coordinate, seam allowance, notch position, or graded measurement is ever produced by a model.
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.
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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
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Seam checking. Pair two edges and PatternPlot reports what each one measured at every size in your run, and whether the notches on them line up. When a pairing cannot be made, it says why in words instead of doing nothing.
Per-point grade corrections. When the proportional grade moves a shoulder or a neckline further than you want, correct that one point and leave the rest of the piece alone. If you later change the size run, PatternPlot tells you the corrections were made for a different run and removes them in one tap, instead of grading with them out of step.
Corrections that outlive the piece. Name the points you corrected, save them to a file, and read that file into your next garment. Reading a saved file is free; writing one is part of Pro.
Two more files in Pro. A vector outline of every piece at every size, and a spreadsheet of what every declared seam measured, size by size.
Calibration you cannot get backwards. Tap the four corners of your reference rectangle in any order and enter its sides either way round; a card lying portrait is no longer stretched or mirrored. PatternPlot also tells you when the rectangle is small for what you photographed — before you trace, not after. Safer tracing. A new photo starts a fresh trace, and tracing again never replaces a piece you have already edited — it adds a new one.
Vector import that uses the width you measured. When an SVG has no real-world size, pick the shape you measured and type its width. Shapes inside definitions and clipping paths are no longer imported as pieces, and skewed or aspect-fitted artwork comes in at the right size and shape.
Exports that match the screen. Every export includes your latest corrections, and pieces with the same name no longer overwrite each other's files. The layered nest PDF now prints the right way up, on one sheet that fits the whole run, with both the cutting and stitching lines.
Also fixed: seam allowance at inward corners between two different widths; curves in the editor now drawn as they print; adding or removing a size keeps every other size's growth and your base size; growth and point fields follow your chosen unit.
The subscription screen shows the free-trial offer only to accounts still eligible for it. If you have already used the trial, it shows the annual price on its own, so the amount you will be charged is always clear.
Tracing, editing, seam allowance, notches, grainline, grading your own piece, the quality report, and tiled or A0 PDF export are still free.
The developer, Andrey Tyurin, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- User Content
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Andrey Tyurin
- Size
- 2.8 MB
- Category
- Graphics & Design
- Compatibility
Requires iPadOS 17.0 or later.
- iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
- iPad
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Pro Grading $79.99
- Copyright
- © 2026 Andrey Tyurin
