Comparison

Zero vs 72Hour Fasting Timer

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

Head to head
About

Zero

This app helps you track intermittent fasting and nutrition to achieve body composition changes. It integrates fasting, protein intake, meals, hydration, and habits for a holistic approach to weight loss and metabolic health.

Highlights
  • Intermittent fasting timers and streaks
  • Photo-based meal logging with macro analysis
  • Personalized daily protein targets
  • Water intake tracking
  • Habit tracking (movement, sleep, mood)
  • Progress visualization and trend analysis
  • Expert insights on fasting and nutrition
Features
Read full description

Zero is the all-in-one fasting tracker and nutrition app built for real results. Most fasting and weight loss apps stop at simply tracking fasts or calories. Zero connects the full picture — fasting, protein, meals, hydration, and habits — so you actually change your body composition, not just your eating schedule. Here’s how Zero helps you get there: • Track your intermittent fasting — Engage timers, streaks, and insights keep you stay motivated and consistent across your entire fasting journey. • Log meals the smart way — Skip the tedious manual meal entry routine. With Zero Plus, snap a photo and get instant macros, protein composition, and clarity on how effectively your meals support your goals. Your first meal logs are on us, so you can try it before you subscribe. • Hit your Protein Score — Zero Plus tracks a personalized daily protein target that adapts to your weight and goals. Better protein = better satiety, better muscle retention, better weight loss. Zero makes it automatic. • Complete the equation: Fasting + Protein — Most people fast or track meals. Zero brings them together so you lose weight, protect muscle, and avoid the pressure and guilt of traditional calorie trackers. • Stay hydrated to power your fasts — Water tracking with Zero Plus helps you maintain energy, reduce cravings, and support metabolic function throughout the day. • Build healthy habits that actually matter — Track movement, sleep, mood, and other daily pillars that reinforce your fasting and fueling routine. • Challenge yourself — Hit protein targets, maintain fasting streaks, and stay accountable with motivating challenges built around outcomes, not vanity metrics. • Learn the real science — Understand how fasting, protein, and hydration work together for sustainable weight loss and metabolic health — with insights from leading experts. • See measurable progress — Watch your streaks grow, your protein consistency rise, and your body composition improve with clean, insightful trend views. Whether you’re starting out or optimizing an existing routine, Zero gives you the structure, guidance, and clarity most apps miss. Zero is not a medical device and does not provide medical advice, diagnosis, or treatment. Always consult your doctor or qualified healthcare provider before making any changes to your diet, fasting routine, or health regimen. Zero is free to download, with fasting timers, streaks, weekly trends, expert articles, and challenges included. Zero Plus is an optional subscription that unlocks photo meal logging and your Protein Score, water tracking, custom fasts and saved presets, Fat-Burning Mode, the mood journal and daily habit insights, premium articles and Plus-only challenges, and monthly, yearly, and correlated charts. A free trial is available. Payment for Zero Plus will be charged to your Apple Account when you subscribe. Subscriptions automatically renew unless auto-renew is turned off at least 24 hours before the end of the current period. Manage your subscription in your Account Settings. Read more terms & conditions: Terms of use: https://www.zerolongevity.com/terms-of-use Privacy policy: https://www.zerolongevity.com/privacy-policy

About

72Hour Fasting Timer

This app assists users in tracking extended fasting periods of 24, 48, or 72 hours. It provides progress zones, statistics, and reminders to help users stay focused and motivated during their fasting journey.

Highlights
  • Smart fasting timer
  • Progress zones (fat burning, autophagy)
  • Statistics and history
  • HealthKit sync
  • Notifications and reminders
  • Minimalist design
Features
Read full description

Fasting Timer 72 is your personal companion for extended fasts (24h, 48h, 72h). Whether you're doing intermittent fasting, OMAD, or long-term fasting, this app helps you track progress, stay focused, and stay motivated. Features: - Smart fasting timer - Progress zones (fat burning, autophagy, etc.) - Statistics and history - HealthKit sync (optional) - Notifications and reminders - Minimalist design. No ads. Just fasting — tracked right.

Screenshots

Zero4 screens
72Hour Fasting Timer4 screens

Verdict

The call

The clearest difference is price: Zero at Free against 72Hour Fasting Timer's $1.99. Zero also leads on rating (4.8 vs 4.3) and ratings volume (445K vs 3). 72Hour Fasting Timer's advantage is in-app purchases (none vs 10) and review sentiment (67% vs 32%). On ads, chart position 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

CostPrice · In-app purchases · Ads · Monetization

Zero is free to download; 72Hour Fasting Timer costs $1.99 up front. Zero sells 8 in-app purchases, starting at $9.99 per month. 72Hour Fasting Timer asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Zero holds the better App Store score, 4.8 against 4.3. That said, the two scores are not equally well evidenced: Zero has 445K ratings behind it against 3, so its average is the more settled of the two. Written reviews complicate that: 32% of Zero's written reviews are positive against 67% of 72Hour Fasting Timer's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Zero ships an update every 2 weeks, 72Hour Fasting Timer every 4 days. The most recent releases landed on November 6, 2026 and November 5, 2026 respectively.

Scorecard8 real differences · 3 level
Zero versus 72Hour Fasting Timer: the parameters behind the verdict, then further details
ParameterZero72Hour Fasting Timer
PriceFree — better$1.99
Rating4.8 (445K ratings) — better4.3 (3 ratings)
Positive reviews32.0% of reviews66.7% of reviews — better
Number of ratings445K — better3
Update frequencyEvery 2 weeksEvery 4 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemium — betterPaid
Best chart rank#110 — better#193
DevicesiPhone, Apple WatchiPhone, iPad, iPod — better
Requires iOS17.015.0 — better
Further details — not scored
Size188 MB7 MB
Age rating17+17+
DeveloperZero Longevity Science, Inc.POWER SATELLITE LLC

Customer experience

Zero

All ratings445,321 ratings
Positive96.3%
Neutral2.1%
Negative1.6%
Written reviews1,400 reviews
Positive32.0%
Neutral8.6%
Negative59.4%

72Hour Fasting Timer

All ratings3 ratings
Positive66.7%
Neutral33.3%
Negative0.0%
Written reviews3 reviews
Positive66.7%
Neutral33.3%
Negative0.0%

Bugs and requests

Zero

Reported bugs

3 issues
  • Password reset problems
  • Inaccurate fasting time tracking
  • Inability to exit trial without subscribing

Requested features

6 requests
  • Custom fasting periods longer than 24 hours
  • Ability to edit fasting type and duration
  • Integration with more health/fitness apps
  • Water intake tracking
  • Personalized fasting recommendations
Show 1 more
  • Improved data visualization and analytics

72Hour Fasting Timer

Not enough reviews yet to summarise bugs or requests.

In-app purchases

8 purchases

Zero

Subscriptions8
  • Zero Plus Subscription7 Days trial$9.991 Month
  • Zero Plus Subscription$9.991 Month
  • Zero Plus Subscription7 Days trial2 variants$69.991 Year
Show 5 more
  • Zero Plus Subscription$69.991 Year
  • Zero Plus Subscription1 Year trial2 variants$69.991 Year
  • Zero Plus Subscription1 Month trial$69.991 Year
  • Zero Plus Subscription1 Month trial$89.991 Year
  • Zero Plus Subscription7 Days trial$89.991 Year
None

72Hour Fasting Timer

No in-app purchases

Questions

Is Zero free?
Zero is free to download, with in-app purchases available.
Is 72Hour Fasting Timer free?
72Hour Fasting Timer costs $1.99, with no in-app purchases.
Which has better reviews, Zero or 72Hour Fasting Timer?
Zero is rated higher. Zero averages 4.8 out of 5 from 445K ratings, while 72Hour Fasting Timer averages 4.3 from 3 ratings.
Do Zero or 72Hour Fasting Timer have ads?
Neither Zero nor 72Hour Fasting Timer shows ads.
Which is updated more often, Zero or 72Hour Fasting Timer?
Zero ships an update every 2 weeks, and 72Hour Fasting Timer every 4 days. Most recently, Zero was updated on November 6, 2026 and 72Hour Fasting Timer on November 5, 2026.
Which is more popular, Zero or 72Hour Fasting Timer?
Zero currently peaks at #110 in the App Store charts, and 72Hour Fasting Timer at #193. Chart position reflects recent download velocity rather than total install base.

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