PatternPlot

Privacy Policy

Effective date: 5 July 2026 · Last updated: 14 October 2026

PatternPlot is an iPad app for tracing and grading sewing patterns, published by cpmtek. This policy explains what the app does and does not do with your information. The short version: PatternPlot has no account, keeps your work on your device, and does not track you.

1. Who we are

The app and this service are provided by cpmtek ("we", "us"). For any privacy question, or to exercise a data right described below, contact amtyurin@gmail.com.

2. What the app stores, and where

PatternPlot has no user account and no server-side storage of your content. Everything you create stays on your device:

• Your current project is autosaved as a .patternplot file in the app's Application Support directory and restored the next time you open the app.
• You can explicitly save or open a .patternplot file from the Export screen.
• When you use the share / export sheet, the app writes a temporary PDF to the system temporary directory so it can be shared or saved to Files. This is on-device and handled by iOS.

All of the above is private to your device. Nothing is uploaded to us for storage, and we cannot see your patterns.

3. Advisory service (not offered in this version)

This version of PatternPlot does not send any content to our advisory service. No screen in the app offers it, and grading, quality checks, geometry and exports all happen on your device. The app still contains code for an optional advisory service, which this version never calls, so our App Store privacy details still declare the one kind of data it would send. That data, and how it would be handled, is described here.

Only if a version offers it and you choose to use it, PatternPlot would send the content you choose — a structured, non-personal summary of your pattern (shape labels and overall measurements in millimetres; no name, no account) plus your typed request — to our processing service at patternplot-api.cpmtek.com, which forwards it to our AI provider, Anthropic (Claude), solely to return advisory suggestions and quality-check warnings.

• This data would be processed transiently to generate a response, not stored by us and not used to train models.
• No pattern photo or image would be sent. Only the structured summary and your text would leave the device.
• Suggestions would be advisory only. All measurements and graded geometry are computed on your device and are never sent to, or altered by, the AI. Every response would be re-validated on your device before it could affect anything.

For that call, if it is ever made, Anthropic acts as our processor. See Anthropic's privacy terms for how they handle transient API requests.

4. Camera and photos

If you trace from a photograph, PatternPlot uses your camera to photograph a paper pattern, or the system photo picker to let you choose an existing photo. Images are used on your device to trace an editable, true-scale pattern. Photos are not uploaded to us and are not sent to any AI service.

5. What we do NOT collect

• No name, email address, or account.
• No location.
• No advertising identifiers; no advertising; no cross-app or cross-site tracking.
• No third-party analytics or tracking SDKs.

Email you choose to send us. Help → Send feedback (and the "Tell us" prompt after an export) opens a pre-filled email to us from your own mail account, in an email sheet or your mail app, or shows our address for you to copy. The draft carries the app's version and build number in its subject. Nothing is sent automatically: only if you send that email do we receive your email address and your message, by ordinary email. We use them only to reply to you and to improve the app, and we do not add you to any list.

6. Diagnostics

Crash and performance diagnostics remain on your device unless you explicitly opt in to sending anonymized diagnostics. If you opt in, the data is anonymized and used only to fix bugs and improve reliability. It is never used to identify or track you.

7. Purchases

Purchases and subscriptions are handled by Apple through the App Store and StoreKit. We do not receive or store your payment details. Apple's handling of purchase data is governed by Apple's privacy policy.

8. Children

PatternPlot is not directed at children and we do not knowingly collect personal information from children under 13.

9. Your rights (GDPR / CCPA and similar)

Because PatternPlot has no account and stores your content on your device, most data-subject rights are satisfied directly by you controlling the app and its files:

• Access / portability: your patterns are your local .patternplot and exported PDF files.
• Deletion: delete your files, or delete the app, to remove all on-device data. This version sends none of your pattern data off the device.
• Controller / processor: for the advisory call described in section 3, if a version offers it and you use it, cpmtek is the data controller and Anthropic is a processor. The lawful basis is performance of the service you requested. We do not sell personal information.

To ask a question or make a request, contact amtyurin@gmail.com.

10. Changes to this policy

If we change this policy we will update the effective date above and, for material changes, surface a notice in the app or on this page.