Z Smart Fit vs BuiltDiff
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Z Smart Fit
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Z Smart Fit record your fitness, sleep detail and exercise analysis, make your life better and healthier
BuiltDiff
Log your weightlifting sets and reps with a clean, distraction-free interface. Visualize your progress with charts and personalize the app's appearance. Enjoy offline functionality and a sign-up-free experience for efficient workouts.
- Log lifts, sets, and reps
- Create custom workout routines
- Offline functionality
- Sign-up-free experience
- Visualize progress with charts
- Personalize app appearance
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Track your lifts, sets, and reps and watch your strength soar! Enjoy a clean and simple design that makes navigation a breeze. Focus on your workout without any distractions, making your lifting sessions efficient and effective. Features: - watchOS companion app - Tailor your own workout routines - No internet connection needed - Sign up-free experience - Convenient keyboard add-ons for efficient logging of weights and reps - Permanent recording of all your lifts - Visualize your lifting progression through charts - Select your preferred color and personalize the app to make it uniquely yours
Screenshots
Verdict
The clearest difference is iOS requirement: Z Smart Fit at 12.0 against BuiltDiff's 17.0. On price, update cadence, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
Z Smart Fit ships an update every 11 days, BuiltDiff every 2 weeks. Both last shipped on October 4, 2026.
| Parameter | Z Smart Fit | BuiltDiff |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (2 ratings) — better |
| Number of ratings | — | 2 — better |
| Update frequency | Every 11 days — better | Every 2 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPod | iPhone, iPad, Apple Watch — better |
| Requires iOS | 12.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 82 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Shenzhen Zhongxinlong Semiconductor Co., Ltd. | Timmy Nguyen |
In-app purchases
Z Smart Fit
No in-app purchases
BuiltDiff
No in-app purchases
