StopSun vs Anggle
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
StopSun
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Do you know how much UV your skin receives today? StopSun uses your Apple Watch and iPhone to automatically track and manage your UV exposure. See at a glance how much UV you received during outdoor activities, how long your sunscreen lasts, and the current UV Index. Key Features 1. Automatic UV Exposure Tracking (Apple Watch Integration) Using the ambient light sensor on Apple Watch, StopSun automatically detects when you are exposed to sunlight outdoors. Based on outdoor exposure data from the Health app, you can manage your UV exposure without manually logging it. Supported Models Apple Watch Series 6 or later / Apple Watch SE (2nd generation) or later / All Apple Watch Ultra models 2. Real-Time UV Index Check the real-time UV Index based on your current location. By combining exposure time with the UV Index, StopSun estimates the actual UV exposure your skin receives. 3. Sunscreen Timer & Live Activity No more guessing when to reapply sunscreen. With Live Activity, you can check your sunscreen duration in real time directly from the lock screen. 4. Personalized Alerts by Skin Type Based on the Fitzpatrick skin type, StopSun calculates the maximum UV exposure your skin can safely tolerate in a day. Receive smart alerts before your skin reaches a risk level.
Anggle
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The Easiest Way to Track Your Joint Health Recovery Consistency is key when recovering from a joint injury. Use your iPhone to easily measure your joint's range of motion and monitor your recovery progress at a glance. Effortless Movement Measurement - Automatic Knee Extension/Flexion Calculation: Automatically calculates your knee's extension/flexion angle. Progress at a Glance - Visualized Trends: View your knee extension/flexion angle records visualized in a graph. - Track Changes: Easily check the changes in your knee's range of motion over time. - Discomfort Level Tracking: Monitor changes in your recorded discomfort levels. Smart Condition Logging - 0-10 Discomfort Scale: Record your level of discomfort on a simple 0-10 scale. - Progress Notifications: Receive messages when improvements or significant changes are detected. How to Use 1. Sit down and place your device on your thigh. 2. The angle will be measured automatically. 3. Record the discomfort level you felt during the measurement. 4. Check your results and compare them with previous records. Recommended For: - Individuals experiencing discomfort in knee movement. - Anyone recovering from a knee injury with rehabilitation exercises. - Those looking to improve their knee's range of motion. - Users who want to quantitatively track their exercise effectiveness. - Anyone who needs to perform regular knee condition check-ups. Privacy - On-Device Storage: All data is stored exclusively on your device. - No Server Uploads: Your data is never transmitted to any external servers. Disclaimer - This app is not a medical device and is not intended to replace professional medical advice, diagnosis, or treatment. - Use the measurement results for your own reference. Always consult with a healthcare professional for medical judgments.
Screenshots
Verdict
The clearest difference is update cadence: Anggle at every 4 days against StopSun's every 6 weeks. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
StopSun ships an update every 6 weeks, Anggle every 4 days. The most recent releases landed on September 20, 2026 and September 14, 2026 respectively.
| Parameter | StopSun | Anggle |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 6 weeks | Every 4 days β better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, Apple Watch β better | iPhone |
| Requires iOS | 18.5 | 17 β better |
| Further details β not scored | ||
| Size | 24 MB | 3 MB |
| Age rating | 12+ | 4+ |
| Developer | Taein Kim | YUJIN JEON |
In-app purchases
StopSun
No in-app purchases
Anggle
No in-app purchases








