Privacy policy

Last updated: 8 October 2026

This policy covers the website elcampeon.dev and the Android apps that ElCampeon Systems publishes on Google Play: Learn Web Application Security, Learn Algorithms & DS and BMI Calculator. ElCampeon Systems is a sole proprietorship in Maharashtra, India, run by Tanmay Patil. Contact: [email protected].

Summary

• None of our apps require an account.
• We don't run our own servers for the apps, and we don't collect your name, email or contacts.
• Learn Web Application Security and Learn Algorithms & DS show ads from Unity Ads and offer an optional Pro upgrade through Google Play.
• BMI Calculator has no ads, no purchases and no tracking.

Learn Web Application Security and Learn Algorithms & DS

Stored only on your device. Your learning progress, flashcard statistics, bookmarks, study streaks, session history, Pro status and settings (such as theme). We can't see this data. Uninstalling the app or clearing its data deletes it.

Advertising (Unity Ads). These apps show ads served by Unity Ads. To serve and measure ads, and to personalise them where allowed, Unity collects:

• your device's advertising ID
• your IP address and approximate location derived from it
• device model and operating system version
• ad interactions, such as impressions and clicks

Unity processes this data under its own privacy policy.

To limit ad personalisation, reset or delete your advertising ID in Android settings (Settings → Privacy → Ads). Buying Pro removes ads.

Pro upgrade (Google Play Billing). Google Play processes payments. We never see your card or payment details. The app receives only a confirmation that the purchase is valid, which it stores on your device.

BMI Calculator

BMI Calculator is free, with no ads and no purchases. The age, height and weight you enter are used only to calculate your BMI on your device. They aren't stored on a server or sent to us or anyone else.

Google Play

Google provides the Play Store and may collect data such as installs and crash reports under Google's privacy policy. We see only the aggregated statistics that Google Play Console shows developers.

Planned AI features

We're building AI features on Anthropic's Claude. They aren't released yet. Before any of them is released, this policy will be updated to describe exactly what is sent. The plan:

• Only the text you choose to send to the AI feature leaves your device.
• Requests go through our own server to Anthropic's API. We don't attach your identity and don't keep requests after the response is returned.
• Anthropic processes these requests under its privacy policy.

This website

elcampeon.dev uses no cookies, analytics or tracking scripts. It's hosted on Cloudflare, which processes technical data such as IP addresses to deliver and protect the site.

Security testing clients

Information shared during a security engagement, such as test accounts, findings and reports, is used only for that engagement, kept confidential, and deleted when the engagement ends unless you ask us to keep it.

Children

Our apps aren't directed at children under 13, and we don't knowingly collect personal data from them.

Your choices and contact

App data stored on your device is deleted when you uninstall the app or clear its data. To ask about your data or request deletion of anything we hold, email [email protected]. We'll reply within 30 days.

Changes

If we change this policy, we'll update the date at the top. Significant changes, such as releasing AI features, will be reflected here before they take effect.