Chamfer-legal

Chamfer Privacy Policy

Effective Date: October 5, 2026
Last Updated: October 5, 2026

This Privacy Policy describes what information Chamfer (“we”, “our”, or “us”) collects when you use the Chamfer app for iPhone and iPad (“App”), and what it doesn’t. By using the App, you agree to the practices described in this policy.

In short: your drawings stay on your device. We never see them, and the App doesn’t upload them anywhere. The App has no analytics, no advertising, no account and no sign-in. The only information that leaves your device is what Apple and RevenueCat need to sell you the subscription and to know that it’s active.

1. Who We Are

Chamfer is a viewer for CAD drawings. It opens DWG, DXF, DWF, DWFx, XPS and STL files, shows their layers and layouts, and exports them to PDF or prints them.

2. Your Drawings

To do its job, the App stores the following on your device:

Your drawings — the files you import or open from other apps, the folders you sort them into, and the files they use, such as their pictures and fonts.
Previews — small pictures of your drawings, which the App makes to show them in the library.
Your settings — how you chose to view your drawings and export them, such as the background color and the paper size.

All of this is kept in the App’s own storage on your device. The drawings themselves are also shown in the Files app under “On My iPhone” or “On My iPad”, so that you can copy them in and out.

The App reads your drawings on the device to display them. It doesn’t send them, their names, or anything in them to us or to anyone else.

2.1 Device Backups

If you back up your device with iCloud or a computer, the App’s files are part of that backup, like those of any other app. The backup is made by Apple under your Apple Account and is covered by Apple’s Privacy Policy. We can’t see or access it.

When you export a drawing to PDF, print it or share it, the file goes where you send it. What happens to it there is covered by that app’s or service’s own privacy policy.

3. Information We Collect

We don’t collect your name, email address, phone number, contacts, location, photos, advertising identifier, or your drawings. The App has no account and no sign-in, and it doesn’t contain analytics, crash reporting, advertising or tracking software.

3.1 Purchase and Subscription Information

The subscription is sold through Apple’s App Store, and we use RevenueCat to know whether it’s active. When you open the App, buy a subscription or restore one, the App sends RevenueCat:

a random identifier that RevenueCat creates for this installation of the App, which isn’t tied to your name or your Apple Account;
your purchases in the App: the product, the dates, the price and currency, and Apple’s transaction identifiers;
technical details that come with any request: the App’s version, your device model, iOS version, language and region, and your IP address.

We receive from this only your subscription status and purchase history under that random identifier. We do not receive or store your payment card details or your Apple Account’s name or email address, and we can’t tell who you are from it.

We use this information only to give you what you paid for and to keep count of our sales. We don’t use it for advertising or profiling, and we don’t sell it.

4. Third-Party Services

The App uses the following third-party services. Each has its own privacy policy.

Apple (App Store and StoreKit)

Purpose: Distributing the App and processing the subscription’s payments.
Data shared: Transaction data, handled entirely by Apple.
Policy: apple.com/legal/privacy

RevenueCat

Purpose: Keeping track of whether your subscription is active.
Data shared: The information listed in Section 3.1.
Policy: revenuecat.com/privacy

5. Data Storage and Security

Your drawings are stored in the App’s container on your device, protected by iOS. Subscription information is sent to RevenueCat over encrypted connections (HTTPS/TLS).

6. Permissions

The App doesn’t ask for access to your camera, microphone, location, contacts or Photos library. It only receives the files you choose to import or open in it.

7. Children’s Privacy

The App is not directed at children under the age of 13. We do not knowingly collect personal information from children under 13. If you believe a child has provided us with personal information, please contact us and we will delete it.

8. Your Rights and Choices

Everything the App stores on your device is under your control:

Your drawings — delete a drawing or folder in the App or in the Files app, or delete the App to remove everything it stored on the device.
Your subscription — manage or cancel it in Settings > [your name] > Subscriptions.

Depending on where you live, you may have the right to access, correct or delete the personal data held about you. The only data held about you is the subscription information described in Section 3.1. Because it isn’t tied to your name or email address, please contact us from the device with the App installed and we will help you find it and delete it.

California residents (CCPA): We do not sell or share personal information.
EEA/UK residents (GDPR): We process subscription information because it is necessary to provide the subscription you bought. Apple and RevenueCat may process it outside your region, under the safeguards described in their privacy policies.

9. Data Retention

Your drawings are kept on your device until you delete them or the App.
Subscription information is kept by RevenueCat for as long as we offer the App, or until you ask us to delete it.

10. Changes to This Policy

We may update this Privacy Policy from time to time. When we do, we will revise the “Last Updated” date at the top of this page. Continued use of the App after changes means you accept the updated policy.

11. Contact Us

If you have questions or requests regarding this Privacy Policy, please contact us at:

Email: pysarenko.dev@gmail.com
Developer: Volodymyr Pysarenko