Privacy policy

Last updated: 2 November 2026

This policy explains what happens to your information when you use DermStudy (the app) and this website. DermStudy is provided by Duzzlr Pte. Ltd. ("we"). Contact: [email protected].

The short version

• No accounts. You don't sign up inside the app.
• Your study progress is stored only on your device, in your browser's local storage. We can't see it.
• The app has no analytics, advertising or tracking code.
• When you unlock the app, your license key is sent once to our license-check service, which passes it to Gumroad to confirm the purchase.

What the app stores on your device

Your answers, progress, settings, streak and the license confirmation are saved in your browser's local storage, and app files and images are saved in the browser cache so it works offline. This stays on your device until you clear it, use "Erase all progress" in the app, or uninstall it. If you export a progress file, you decide where it goes.

License check

To unlock the full app, your license key (and our product ID) is sent over HTTPS to a small server function hosted on Cloudflare, which forwards it to Gumroad's license API and returns whether the key is valid and not refunded or disputed. The app may repeat this check quietly in the background about once a month when you're online. We don't store your key on our servers or log it.

Purchases

Payments are handled by Gumroad. Gumroad processes your name, email and payment details under its own privacy policy (gumroad.com/privacy). We receive the sale details Gumroad provides to sellers, such as your email address, to deliver your purchase and support.

Hosting

The app and this website are hosted on Cloudflare Pages. Like any web host, Cloudflare processes technical data such as IP addresses to deliver pages and protect against abuse, under its own privacy policy (cloudflare.com/privacypolicy). We do not add analytics or tracking scripts to the app or this website.

External links

Some screens link to outside sites (for example, guideline bodies). Those sites have their own policies.

Children

DermStudy is meant for medical students and health professionals and is not aimed at children.

Your rights

Depending on where you live (for example under the Philippine Data Privacy Act or the GDPR), you can ask about, correct or delete personal data we hold. Email [email protected].

Changes

We'll update this page if anything changes and note the date above.