StopSun vs WYR
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.
WYR
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You ran alone along the river, through the park, around the block. But someone else ran the same route, at the same time. WYR automatically discovers runners who ran the same path and connects you. That runner you've been curious about β now you can connect. Running is no longer a solo thing. β Encountered Runners Runners who ran the same path at the same time are automatically discovered. Follow the runners you've been curious about and stay connected. Your exact location is never shared. β Signal Drop a Signal on the map and runners will gather to join your run. Set a date, time, and distance for your running plan. "Evening run along the river β who's in?" One message is all it takes. β Challenge Distances you couldn't reach alone β you'll get there together. Create a Challenge and achieve goals with fellow runners. Track everyone's progress in real-time. β My Routes Every path you run is recorded on the map. Your running map glows brighter with every route. β GPS Run Tracking Precise GPS-based run tracking. Distance, pace, elevation, heart rate. Auto-pause handles traffic lights for you. β Apple Watch Standalone Start a run with just your Apple Watch β no iPhone needed. Real-time pace, distance, and heart rate on your wrist. β Running App Sync Import your existing runs and start right away. Apple Health Β· Samsung Health Β· NRC Β· Strava supported. β Running DNA Your unique running patterns, analyzed. Pace distribution, weekly distance, running habits at a glance. β Run Sharing Turn today's run into a beautiful card and share it. Dark, Coral, Cream templates β ready for Instagram Stories. β Privacy - Your exact location is never shared with other users - You stay invisible unless you choose to be seen - Block, report, and mute are fully supported See you on the same path. WYR β When You Run
Screenshots
Verdict
The clearest difference is update cadence: WYR at every 5 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, WYR every 5 days. The most recent releases landed on October 25, 2026 and October 10, 2026 respectively.
| Parameter | StopSun | WYR |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 6 weeks | Every 5 days β better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, Apple Watch | iPhone, Apple Watch |
| Requires iOS | 18.5 | 17.0 β better |
| Further details β not scored | ||
| Size | 24 MB | 81 MB |
| Age rating | 12+ | 4+ |
| Developer | Taein Kim | Tae hyun Kwon |
In-app purchases
StopSun
No in-app purchases
WYR
No in-app purchases









