Refyn
Refyn is a cross-platform privacy app that helps people take back control of the ads they see. Users set category preferences — block gambling, alcohol, dating, and more — and Refyn compiles those choices into GDPR Article 21 "right to object" requests, emails them to each major platform on the user's behalf, and tracks the responses. It ships as a native iOS/Android app plus a companion Chrome extension that blocks gambling-type sites. Tecaudex delivered end-to-end development: a React Native app, a NestJS backend with an automated request engine, and the browser extension.
Key Features
A closer look at the core features and technologies that shape this project designed for efficiency, innovation, and impact.
- Email + OAuth Sign-In
- Ad-Category Preferences
- Article 21 Request Engine
- Daily Batch Compiler
- Automated Platform Emailing
- Confirmation Tracking
- Signed Authorization Records
- Impact Dashboard
- Chrome Extension Blocker
- Per-Platform Templates
- Sign in with Apple
- Account & Data Deletion
- Preference Reset
- Manual Fallback Status Sync
- Push Notifications
Email + OAuth Sign-In
Ad-Category Preferences
Article 21 Request Engine
Daily Batch Compiler
Automated Platform Emailing
Confirmation Tracking
Signed Authorization Records
Impact Dashboard
Chrome Extension Blocker
Per-Platform Templates
Sign in with Apple
Account & Data Deletion
Preference Reset
Manual Fallback Status Sync
Push Notifications
Technology Stack
The tools and services behind the build.
Key Results
Real numbers. Real results. These highlights capture the difference our work made in growth, visibility, and user engagement.
10 platforms
3 products
MVP
Visual Highlights
A visual overview of the finished product highlighting its design.
About the Client
Refyn (REFYN LIMITED) is an early-stage privacy startup, based in Europe, building consumer tools that give people control over ad targeting across the major platforms.
People have no single, easy way to exercise their legal right to object to ad profiling across the ten biggest platforms. The goal was an app that turns a few preference toggles into real, tracked GDPR requests sent automatically on the user's behalf.
Challenges
- No central ad-preference control
- Opt-outs scattered across every platform
- GDPR rights hard to exercise
- Gambling and alcohol ads unavoidable
- No proof a request was ever sent
Users held real legal rights over ad profiling but had no practical way to use them across platforms.
Turning per-platform preferences into defensible GDPR Article 21 requests — a daily batch compiler that generates per-platform email templates, stores a signed authorization record against each preference version, and tracks replies with a manual fallback when a platform does not respond automatically.
Strategy-first planning
Execution with momentum
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