U vs Diet Challenge
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
U
Track your menstrual cycle and ovulation patterns with this app. It allows you to store daily pictures for long-term monitoring of changes, helping you understand your unique ovulation curves and menstrual cycle.
- Daily picture storage for tracking
- Long-term crystal pattern monitoring
- Ovulation curve visualization
- Menstrual cycle change monitoring
- Sharing ovulation information
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U-TEST APP (Has been approved by the Taiwan Ministry of Health and Welfare.) (https://tinyurl.com/ywvdwh2k) ‧ Use with U-TEST APP to take pictures and save records easier. ‧ Store daily picture in your smartphone for a long-term tracking of the crystal pattern changes. ‧ Every woman has her own ovulation curves. ‧ 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: • Meal tracking and calorie estimates from meal photos • Water and exercise logging • Friend-based diet races • Solo challenge options • Daily coaching notes • 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 · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · 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 November 11, 2026 and October 31, 2026 respectively.
| Parameter | U | Diet Challenge |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 25.0% of reviews | — |
| Update frequency | Every 5 weeks | Every 4 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 9.0 — better | 15.0 |
| Further details — 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
