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!

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### 📋 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!

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### 🌟 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.

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### 🪙 SUPPORTED COINS

* Euro (EUR)
* Czech Koruna (CZK)