U vs Diet Challenge
Price, ratings, monetisation and update history for both apps, side by side ā with what reviewers say about each.
U
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U-TEST APP (Has been approved by the Taiwan Ministry of Health and Welfare.) (https://tinyurl.com/ywvdwh2k) ā§ Use with U-TEST APP to take pictures and save records easier. ā§ Store daily picture in your smartphone for a long-term tracking of the crystal pattern changes. ā§ Every woman has her own ovulation curves. ā§ It can help you to monitor the change of your menstrual cycle by sharing the ovulation information.
Diet Challenge
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Diet Challenge is a subscription-based meal tracking and friend competition app designed to make healthy eating more motivating. A Premium subscription is required to continue using the app and access all features. The features below require a separate purchase through a Premium subscription: ā¢ Meal tracking and calorie estimates from meal photos ā¢ Water and exercise logging ā¢ Friend-based diet races ā¢ Solo challenge options ā¢ Daily coaching notes ā¢ Weekly progress summaries Diet Challenge focuses on simple daily check-ins instead of complex dashboards, making progress easier to see and easier to maintain. Terms of Use: https://ahmetmvural.com.tr/terms-of-use/
Screenshots
Verdict
The clearest difference is in-app purchases: U at none against Diet Challenge's 2. U also leads on iOS requirement (9.0 vs 15.0). Diet Challenge's advantage is update cadence (every 4 days vs every 5 weeks). On price, ads and device support there is nothing between them.
Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS
Both are free to download. Diet Challenge sells 2 in-app purchases, starting at $6.99 per month. U asks for nothing beyond the download.
U ships an update every 5 weeks, Diet Challenge every 4 days. The most recent releases landed on September 17, 2026 and September 22, 2026 respectively.
| Parameter | U | Diet Challenge |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 5 weeks | Every 4 days ā better |
| Ads | No | No |
| In-app purchases | No ā better | Yes |
| Devices | iPhone, iPad, iPod ā better | iPhone, iPod |
| Requires iOS | 9.0 ā better | 15.0 |
| Further details ā not scored | ||
| Size | 293 MB | 23 MB |
| Age rating | 4+ | 4+ |
| Developer | SMARTCHIP MICROELECTRONICS CORP. | Ahmet Muhammet Vural (AN) |
In-app purchases
U
No in-app purchases
Diet Challenge
- Monthly Premium3 Days trial$6.991 Month
- Annual Premium3 Days trial$39.991 Year
