Privacy and licenses

Last updated 7 October 2026 by Peak Apps Studio. Contact: peakappsstudios@gmail.com

Your files stay on your device

The tumbler template generator, the KDP coloring book interior maker and the sewing pattern printer process images and PDFs inside your browser with JavaScript. The files you open are not uploaded to us or to anyone else, and closing the tab discards them.

What is stored in your browser

We keep a few settings in your browser's local storage so the tools remember them: for example your last measurements, trim size or unit. If you activate Pro, the license key and the date it was last checked are stored there too. Clearing your browser data removes all of it.

Pro licenses and Gumroad

Pro is sold through Gumroad, which handles payment, receipts, taxes and refunds under its own privacy policy. When you activate Pro, your browser sends the license key to Gumroad's license API to confirm the purchase; we receive no card details. The key is re-checked about once a week, and Pro switches off if a purchase is refunded.

A Pro license is for one person. You may use it on your own computers and use what you make with the tools in products you sell.

No tracking cookies

These pages set no advertising or tracking cookies. Our hosting provider keeps standard server logs (such as IP address and the page requested) for security and reliability.

Open-source software

The tools use pdf.js (Apache License 2.0) to read PDFs, pdf-lib (MIT License) to write them and JSZip (MIT License) to package batch downloads. Their licence texts ship with the tools.

Contact

Questions, refunds or a measurement that looks wrong: email peakappsstudios@gmail.com.