Comparison

Null Fasting vs GRBX

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

Head to head
About

Null Fasting

This app helps you track intermittent fasting with flexible protocols, detailed statistics, and motivational tools. It integrates with health platforms and offers personalized goal setting for a healthier lifestyle.

Highlights
  • Flexible fasting protocols (16:8, OMAD, custom)
  • Intelligent tracking with timers and notifications
  • Comprehensive statistics and progress analysis
  • Apple Health integration
  • Milestone tracking and educational content
  • Personalized motivation and goal setting
  • Smart scheduling and reminders
Features
Read full description

Transform your health journey with Null, the intelligent fasting companion that makes intermittent fasting simple, insightful, and rewarding. Null is a comprehensive intermittent fasting tracker designed to support your fasting goals with powerful tracking features, detailed statistics, and motivational tools. Whether you're new to fasting or a seasoned practitioner, Null provides everything you need to establish and maintain a successful fasting routine. Key Features: FLEXIBLE FASTING PROTOCOLS Track popular fasting methods including 16:8, 18:6, 20:4, OMAD, and more Create custom fasting durations tailored to your specific needs Choose between countdown or count-up timers based on your preference Schedule recurring fasts to automate your fasting routine INTELLIGENT TRACKING Monitor your active fast with precise timers and progress indicators Receive notifications for fasting milestones and achievements Pause and resume functionality for real-world flexibility Smart time zone handling ensures accurate tracking while traveling COMPREHENSIVE STATISTICS View detailed insights about your fasting history and patterns Track completion rates, average durations, and consistency scores Analyze weekly, monthly, quarterly, or yearly fasting data Compare performance between time periods to measure progress HEALTH INTEGRATION Sync your fasting data with Apple Health (optional) Track weight changes and correlate them with your fasting habits Monitor water intake during fasting periods Connect fasting metrics with other health data for a holistic view MILESTONE TRACKING Learn about physical benefits as you reach fasting milestones Track autophagy, ketosis, and other fasting-related biological processes See your progress visualized through informative timeline indicators Understand the science behind intermittent fasting as you progress PERSONALIZED MOTIVATION Earn awards and achievements as you build consistency Track and celebrate fasting streaks with visual celebrations Set and achieve custom goals tailored to your health journey Choose your preferred motivational style from friendly to humorously snarky SMART SCHEDULING Create recurring fasting schedules that fit your lifestyle Receive reminders when it's time to start your next fast Add exception dates for special occasions without breaking your routine Get notified when your scheduled fasts are coming up BEAUTIFUL INTERFACE Clean, intuitive design that makes tracking your fasts effortless Multiple theme options to personalize your experience Dark mode support for comfortable nighttime use Straightforward data visualization that clearly shows your progress GOAL-BASED APPROACH Set personalized fasting goals based on total fasts, hours, or consistency Track progress toward your goals with visual indicators Celebrate when you reach important milestones Create new challenges as you master your fasting practice Null goes beyond basic fasting timers by providing educational content about the physiological changes happening during your fast. Learn about fat burning, ketosis, autophagy, and cellular regeneration as you reach key milestones in your fasting journey. Your privacy matters to us. All data is stored locally on your device, with optional, secure Apple Health integration. No account creation required. Whether you're fasting for weight management, metabolic health, longevity, or spiritual practice, Null provides the tools you need to succeed. Start your fasting journey today with the support of an app that understands the science and challenges of intermittent fasting. Download Null now and transform your relationship with food, time, and health! Note: This app is designed as a tool to support intermittent fasting practices. Please consult with your healthcare provider before starting any fasting regimen, especially if you have existing health conditions or concerns.

About

GRBX

This tool helps you proactively manage vehicle ownership by tracking maintenance history and providing predictive insights. It evolves with your car, offering advanced analytics and an AI assistant to optimize your vehicle's lifespan and your decision-making.

Highlights
  • Predictive maintenance insights
  • Vehicle maintenance history tracking
  • Advanced analytics
  • Document organization
  • AI assistant for idea generation
  • Proactive vehicle care strategy
Features
Read full description

GRBX helps drivers and families keep vehicle maintenance, service history, recalls, reminders, documents, and vehicle questions organized in one place. Track what has been done, see what needs attention, and keep a useful record for every vehicle you own. GRBX is built for the information that usually gets scattered across receipts, mechanic invoices, notes, recall notices, and memory. What You Can do With GRBX • Track maintenance by vehicle • Keep service history, mileage, costs, and notes organized • See upcoming and overdue maintenance • Review recall information for your vehicles • Store receipts and vehicle documents • Ask the GRBX Assistant about maintenance, warning lights, unusual noises, repair decisions, and other vehicle questions • Manage multiple vehicles from one garage • Prepare for a mechanic visit with your records and vehicle context in one place Built Around Your Vehicle GRBX uses the vehicle and maintenance information you save to make its guidance more relevant to the car you are asking about. Your records stay organized by vehicle, so you can look back at previous work and make better-informed maintenance decisions. For Everyday Ownership Whether you manage one car or several vehicles for your household, GRBX gives you a clearer view of what has happened, what may be due next, and what deserves attention. GRBX is designed to support vehicle ownership and maintenance decisions. It does not replace professional diagnosis or repair. Safety-critical vehicle issues should be inspected by a qualified technician. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.grbxapp.com/legal

Screenshots

Null Fasting4 screens
GRBX4 screens

Verdict

The call

The clearest difference is in-app purchases: Null Fasting at none against GRBX's 4. GRBX's advantage is rating (4.8 vs 4.5) and device support (3 vs 1). On price, review sentiment, update cadence 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. GRBX sells 4 in-app purchases, starting at $4.99 per month. Null Fasting asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

GRBX holds the better App Store score, 4.8 against 4.5. Both are backed by a comparable volume of ratings — 2 and 6 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

Null Fasting ships an update weekly, GRBX every 5 days. The most recent releases landed on October 14, 2026 and October 19, 2026 respectively.

Scorecard6 real differences · 4 level
Null Fasting versus GRBX: the parameters behind the verdict, then further details
ParameterNull FastingGRBX
PriceFreeFree
Rating4.5 (2 ratings)4.8 (6 ratings) — better
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings26 — better
Update frequencyWeeklyEvery 5 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterAd-supported
DevicesiPhoneiPhone, iPad, iPod — better
Requires iOS17.615.0 — better
Further details — not scored
Size21 MB6 MB
Age rating4+4+
DeveloperYMMVGearbox Technologies LLC

Customer experience

Null Fasting

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

GRBX

All ratings6 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Null Fasting

No in-app purchases

4 purchases

GRBX

Subscriptions4
  • GRBX Pro$4.991 Month
  • GRBX Family$9.991 Month
  • GRBX Pro Annual$49.991 Year
Show 1 more
  • GRBX Family Annual$99.991 Year

Questions

Is Null Fasting free?
Null Fasting is free to download, with no in-app purchases.
Is GRBX free?
GRBX is free to download, with in-app purchases available.
Which has better reviews, Null Fasting or GRBX?
GRBX is rated higher. Null Fasting averages 4.5 out of 5 from 2 ratings, while GRBX averages 4.8 from 6 ratings.
Do Null Fasting or GRBX have ads?
Neither Null Fasting nor GRBX shows ads.
Which is updated more often, Null Fasting or GRBX?
Null Fasting ships an update weekly, and GRBX every 5 days. Most recently, Null Fasting was updated on October 14, 2026 and GRBX on October 19, 2026.

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