Comparison

Prime vs ZoneLock

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Prime

This app offers a tailored intermittent fasting experience for women, featuring a fasting tracker, weight monitoring, and personalized guidance. It helps users achieve fitness goals, manage weight, and understand the health benefits of fasting with a focus on women's specific needs.

Highlights
  • Fasting tracker (16:8 protocol)
  • Weight tracker
  • Water tracker with reminders
  • Personalized daily recommendations
  • Body status tracking
  • Fasting/eating interval stats
  • Community club
Features
Read full description

Prime: Intermittent Fasting App is the first fasting app tailored exclusively to women. Designed with an extremely effective fasting protocol, a simple weight tracker, fasting stats, and all the answers to your burning questions. Free Prime: Intermittent Fasting App will help you reach your fitness goals, take control of your weight (and life!), regulate your hormones, and enjoy all the health benefits that intermittent fasting offers in just a few simple clicks. Now’s the time to get the healthy body of your dreams. What are you waiting for? Install the app and start seeing results immediately! FEATURES: ** Fasting tracker ** The app focuses on the 16:8 fasting protocol — the most suitable protocol for women, but also provides other fasting protocols. Fasting presets work perfectly with any diet or food restrictions: keto, paleo, gluten-free, etc. Whether you are just starting out or already familiar with intermittent fasting, the Prime: Intermittent Fasting App will guide you through the process. ** Weight tracker ** Monitor your progress with the app’s weight tracker as it provides valuable insights. Nothing is more satisfying than seeing that weight curve move in the right direction? The app will help you achieve the weight goals that are right for you. ** Water tracker ** Don't forget to drink water! Use our water tracker with a reminder function. We automatically calculate the right amount for you. ** Personal daily recommendations ** Stay healthy and motivated with our daily recommendations! ** Body status ** We identify and track key stages in your fasting journey. ** Stats ** Track your fasting/eating intervals with a simple fasting plan. The beauty of intermittent fasting lies in its simplicity and efficiency. Forget about those rollercoaster diets and cleanses, and let the Prime Fasting App guide you to where you need to get. ** Insights ** Prime: Intermittent Fasting has been customized for women, based on their biology and needs. Through insights, you can access the knowledge of intermittent fasting for women and get your questions answered. For example, did you know that with intermittent fasting you can also build muscle? We explain how it works in our insights. ** The Club ** Join the community club and share your success with others. We are all here to change. Let’s empower each other! ** Personal coach ** Apply for the course with a personal coach! ** Health App Integration ** Prime: Intermittent Fasting App integrates the following data from the Health app (HealthKit) to keep track of your body status: body mass index, exercise minutes, height, weight, mindful minutes, date of birth, steps, and water. ** Subscription Information ** The Prime: Intermittent Fasting App is free to download and offers paid premium features. The Premium gives you access to personalized daily recommendations, insights, recipes, chat support, club chat, and statistics. Your subscription renews automatically unless canceled at least 24 hours prior to the end of the current period. Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable. Intermittent fasting has been the talk of the health world for good reason. The positive outcomes associated with the fasting lifestyle include self-healing mechanisms, detoxing, anti-aging, and other worthwhile benefits. Do you truly need to take a deep dive into all the research on intermittent fasting? Not really. All you need to do is download the Prime: Intermittent Fasting App. The app will happily guide you through the steps you need to manage your health and well-being. Note: This app is developed for informational purposes only. You must always consult your physician or doctor before starting any diet program. Terms & Conditions: https://primehealth.one/tc Privacy policy: https://primehealth.one/pp

About

ZoneLock

Features
Read full description

STOP CHECKING YOUR WRIST WHILE YOU TRAIN. ZoneLock keeps you in your target heart-rate zone with real-time voice, audio, and haptic cues. Pick a zone, start your session, and know the moment you need to push harder, ease off, or when you're back in range. TRAIN WITH APPLE WATCH OR A CHEST STRAP Use your Apple Watch as your live heart-rate source or connect a compatible Bluetooth heart-rate chest strap. Start a session and let ZoneLock monitor your effort while you focus on the workout. REAL-TIME ZONE GUIDANCE Choose Zone 1 through Zone 5. ZoneLock alerts you when you move above or below your target so you can adjust without constantly looking at a screen. PERSONALIZED HEART-RATE ZONES Set up your five training zones using your profile and ZoneLock's guided calibration flow. Your BPM ranges are saved so you can start future sessions quickly. SESSION SUMMARIES Review time in zone, average BPM, max BPM, and how much of each workout was below, in, or above your target - right after every session. BUILT TO KEEP TRAINING SIMPLE - Apple Watch support - Bluetooth chest-strap support - Voice, audio, and haptic zone cues - Zone 1 through Zone 5 - Personalized BPM ranges - Session summaries and sharing - Dark interface designed for training environments ZoneLock is free to download and free to train with. ZoneLock Pro unlocks your full session history, ZoneSignal - a daily readiness signal built from sleep, HRV, resting heart rate, and recent training load - and 4 additional voice-cue characters. ZoneLock Pro - auto-renewable subscription - Monthly: $2.99 per month - Annual: $19.99 per year Each plan begins with a 7-day free trial. Payment is charged to your Apple Account at confirmation of purchase. Subscriptions renew automatically unless auto-renew is turned off at least 24 hours before the end of the current period. Manage or cancel anytime in your iPhone Settings. Privacy Policy: https://zonelock.app/privacy Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Prime4 screens
ZoneLock4 screens

Verdict

The call

The clearest difference is update cadence: ZoneLock at every 9 days against Prime's every 3 weeks. ZoneLock also leads on device support (4 vs 1) and iOS requirement (15.0 vs 17.6). On price, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Prime sells 9 in-app purchases, starting at $9.99 per month and ZoneLock sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Prime ships an update every 3 weeks, ZoneLock every 9 days. The most recent releases landed on November 7, 2026 and October 31, 2026 respectively.

Scorecard3 real differences · 7 level
Prime versus ZoneLock: the parameters behind the verdict, then further details
ParameterPrimeZoneLock
PriceFreeFree
Rating4.6 (4.6K ratings) — better—
Positive reviews42.9% of reviews—
Number of ratings4.6K — better—
Update frequencyEvery 3 weeksEvery 9 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhoneiPhone, iPad, iPod, Apple Watch — better
Requires iOS17.615.0 — better
Further details — not scored
Size323 MB11 MB
Age rating17+4+
DeveloperSergei SharovVishesh Bhardwaj

Bugs and requests

Prime

Reported bugs

4 issues
  • Lost user progress and data
  • Subscription issues and lack of refunds
  • Unresponsive start/stop fasting buttons
  • Incorrect weight and fasting time tracking

Requested features

5 requests
  • Sync with fitness trackers
  • More varied meal plans and recipes
  • Ability to manually adjust fasting times
  • Customizable notifications and reminders
  • Integration with calorie tracking

ZoneLock

Not enough reviews yet to summarise bugs or requests.

In-app purchases

9 purchases

Prime

Subscriptions9
  • SPECIAL DISCOUNT OFFER$9.991 Month
  • Premium Subscription$14.991 Month
  • Premium Subscription$19.991 Month
Show 6 more
  • Premium Subscription2 variants$29.993 Months
  • Premium Subscription$39.991 Year
  • Premium Subscriptions$39.993 Months
  • Premium Subscription$49.991 Year
  • Premium Subscription$59.991 Year
  • Premium Subscription$69.991 Year
2 purchases

ZoneLock

Subscriptions2
  • ZoneLock Pro Monthly7 Days trial$2.991 Month
  • ZoneLock Pro Yearly7 Days trial$19.991 Year

Questions

Is Prime free?
Prime is free to download, with in-app purchases available.
Is ZoneLock free?
ZoneLock is free to download, with in-app purchases available.
Do Prime or ZoneLock have ads?
Neither Prime nor ZoneLock shows ads.
Which is updated more often, Prime or ZoneLock?
Prime ships an update every 3 weeks, and ZoneLock every 9 days. Most recently, Prime was updated on November 7, 2026 and ZoneLock on October 31, 2026.

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