Camera Ring Sizer

No more guessing your ring size or making extra trips to the jeweler. **Camera Ring Sizer** uses your phone's camera and a simple coin to measure your ring size accurately and effortlessly. Perfect for online ring shopping, surprise gifts, or anytime you need a quick ring size check. Just grab a coin and your phone — Camera Ring Sizer takes care of the rest! --- ### HOW IT WORKS 1. **Place a coin** on your finger like a ring. 2. **Take a photo** using the in-app camera. 3. **The app identifies the coin** and measures your finger automatically. 4. **Get your ring size** in millimeters — and you're done! --- ### KEY FEATURES * **AI-Powered Coin Recognition:** Automatically detects EUR and CZK coins using on-device machine learning. No internet connection is required for measurement. * **Precise Computer Vision:** OpenCV-based contour detection finds both the coin and your finger boundaries for highly accurate sizing. * **Smart Screen Calibration:** Uses device-specific pixel density data for millimeter-accurate results, going well beyond what the standard OS reports. * **Manual Adjustment:** Didn't get a perfect automatic detection? Fine-tune the circles manually on your screen for maximum accuracy. * **Physical Verification:** Display a true-to-size circle on your screen so you can place an actual ring on it to double-check the result. * **Multilingual:** Available in English, Czech, and German. * **Privacy First:** All image processing happens locally on your device. No photos are uploaded or stored remotely. --- ### SUPPORTED COINS * Euro (EUR) * Czech Koruna (CZK)