Zone ZHF vs fast_burn
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Zone ZHF
Monitor your fitness activities both inside and outside the gym. Access class schedules, social media, set fitness goals, and participate in club challenges. Seamlessly integrate with popular fitness trackers and apps, syncing your data with your iPhone's Health app.
- Workout tracking
- Class schedules
- Social media integration
- Fitness goals
- In-club challenges
- Fitness device linking
- Health app sync
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Track your workout in the club and on the go with the Zone Health & Fitness app. The Zone ZHF app provides class schedules, social media platforms, fitness goals, and in-club challenges. Our app will also allow you to link many of the popular fitness tracking devices and fitness apps on the market. The Zone ZHF app uses the Health app that is pre-installed on your iPhone to sync nutrients and workouts data. Because of this, the app will ask you to grant read and write access to your nutrients and workouts data. Your Health sync data is only visible to you and is not sent to anyone but yourself.
fast_burn
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Fasting made simple. FastBurn shows what's happening in your body as you fast - from fat burning to autophagy - so every hour feels like progress. FASTING TIMER One tap to start. A ring UI tracks your elapsed time and body phase: blood sugar rising, fat burning, ketosis, autophagy. PLANS THAT FIT YOU Your goal, body type, and experience determine the best protocol: - 16:8 (16h fast / 8h eat) - 18:6 (18h fast / 6h eat) - 20:4 (20h fast / 4h eat) - 36-hour extended fast WEIGHT TRACKING + APPLE HEALTH Log weight and view trends. Syncs automatically with Apple Health. STATS & CALENDAR Total fasts, average duration, best streak - all at a glance. Calendar view shows your daily history. SMART REMINDERS Customize alerts for fast start, phase changes, and eating windows. FREE FEATURES - 16:8 fasting timer - Fasting history & basic stats - Weight log PRO FEATURES - All fasting plans (18:6, 20:4, 36h) - Detailed body phase tracking - Full statistics & trend charts - Fasting calendar - Unlimited fasting history SUBSCRIPTION DETAILS FastBurn Pro is an auto-renewable subscription. - Annual plan: includes a 7-day free trial - Monthly plan - Payment is charged to your Apple ID at confirmation - Subscription auto-renews unless canceled at least 24 hours before the current period ends - Unused portion of a free trial is forfeited upon purchase - Manage or cancel: Settings > Apple ID > Subscriptions Terms of Use: https://fastburn-legal.vercel.app/terms.html
Screenshots
Verdict
The clearest difference is in-app purchases: Zone ZHF at none against fast_burn's 2. Zone ZHF also leads on device support (3 vs 1) and iOS requirement (14.0 vs 17.0). fast_burn's advantage is update cadence (every 8 days vs every 3 weeks). On price and ads 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. fast_burn sells 2 in-app purchases, starting at $4.99 per month. Zone ZHF asks for nothing beyond the download.
Zone ZHF ships an update every 3 weeks, fast_burn every 8 days. The most recent releases landed on October 24, 2026 and October 6, 2026 respectively.
| Parameter | Zone ZHF | fast_burn |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (855 ratings) — better | — |
| Positive reviews | 78.6% of reviews | — |
| Number of ratings | 855 — better | — |
| Update frequency | Every 3 weeks | Every 8 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 14.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 120 MB | 1 MB |
| Age rating | 4+ | 12+ |
| Developer | Smart Health Clubs | Keiichiro Hayashida |
Bugs and requests
Zone ZHF
Reported bugs
3 issues- Login kicks out users despite valid account
- Account creation not functional in app
- Session authentication failures
Requested features
2 requests- Increase Silver Sneakers class availability and capacity
- Improve app account creation interface
fast_burn
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Zone ZHF
No in-app purchases
fast_burn
- FastBurn Pro (Monthly)$4.991 Month
- FastBurn Pro (Annual)7 Days trial$29.991 Year








