Comparison

Zero vs LadyFast

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 tracks intermittent fasting and nutrition to help users achieve real 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
  • Smart meal logging with photo recognition
  • Personalized daily protein target tracking
  • Integrated fasting and protein tracking
  • Water and habit tracking
  • Science-based 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

LadyFast

This wellness app helps women plan and track fasting, weight, and wellbeing in sync with their hormonal cycles. It offers customizable plans, progress tracking, and wellbeing logs, adapting to each phase of the menstrual cycle for a supportive and personal approach to health.

Highlights
  • Cycle-aligned fasting plans
  • Weight progress tracking
  • Wellbeing and mood logs
  • Customizable fasting schedules
  • Visual progress summaries
  • Menstrual cycle integration
Read full description

LadyFast: Fasting aligned with your cycle LadyFast is a women’s wellness app designed to help you plan and track your fasting, weight, and wellbeing — all in harmony with your hormonal rhythms. Inspired by the cyclical fasting method in Fast Like a Girl by Dr. Mindy Pelz, LadyFast supports you to fast gently and effectively, adapting to each phase of your menstrual cycle. Whether you're just getting started or fine-tuning your routine, LadyFast gives you clarity and control with features like: Customizable fasting plans for different health goals Weight progress tracking Wellbeing logs across mood, energy, and irritability Drag-and-drop calendar to adjust fasting days around life events Visual summaries to help you see your progress over time LadyFast is built by a woman, for women — thoughtfully designed to make fasting supportive, sustainable, and personal. No ads. No pressure. Just a clear, compassionate way to reconnect with your body and take charge of your health. Subscribe to the Metabolic Mastery Yearly Plan — and enjoy a 7-day free trial. Or explore the Metabolic Reset Monthly Plan to get started. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.ladyfastapp.com/privacy-policy/ The LadyFast app is not intended to provide medical advice, diagnosis, or treatment. Fasting is a personal tool — use it in a way that suits your body, lifestyle, and wellbeing. Always consult a doctor or qualified health professional before making any changes to your diet, fasting schedule, or health routine, especially if you have existing medical conditions. Full disclaimer: https://www.ladyfastapp.com/disclaimer

Screenshots

Zero4 screens
LadyFast4 screens

Verdict

The call

The clearest difference is rating: Zero at 4.8 against LadyFast's 1.0. Zero also leads on monetization model (freemium vs subscription) and ratings volume (445K vs 1). 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Zero sells 7 in-app purchases, starting at $9.99 per month and LadyFast sells 2 in-app purchases, starting at $0.49 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Zero holds the better App Store score, 4.8 against 1.0. That said, the two scores are not equally well evidenced: Zero has 445K ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Zero ships an update every 2 weeks, LadyFast every 3 weeks. The most recent releases landed on November 5, 2026 and October 30, 2026 respectively.

Scorecard4 real differences · 7 level
Zero versus LadyFast: the parameters behind the verdict, then further details
ParameterZeroLadyFast
PriceFreeFree
Rating4.8 (445K ratings) — better1.0 (1 ratings)
Positive reviews32.0% of reviews—
Number of ratings445K — better1
Update frequencyEvery 2 weeks — betterEvery 3 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFreemium — betterSubscription
Best chart rank#110 — better—
DevicesiPhone, Apple WatchiPhone, iPad
Requires iOS17.0 — better17.4
Further details — not scored
Size195 MB7 MB
Age rating17+17+
DeveloperZero Longevity Science, Inc.9 TO 3 LAB PTY LTD

Customer experience

Zero

All ratings445,285 ratings
Positive96.3%
Neutral2.1%
Negative1.6%
Written reviews1,400 reviews
Positive32.0%
Neutral8.6%
Negative59.4%

LadyFast

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%

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

LadyFast

Not enough reviews yet to summarise bugs or requests.

In-app purchases

7 purchases

Zero

Subscriptions7
  • Zero Plus Subscription2 variants$9.991 Month
  • Zero Plus Subscription7 Days trial$9.991 Month
  • Zero Plus Subscription7 Days trial2 variants$69.991 Year
Show 4 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 Subscription7 Days trial$89.991 Year
2 purchases

LadyFast

Subscriptions2
  • Metabolic Reset - Monthly$0.491 Month
  • Metabolic Mastery - Yearly$2.991 Year

Questions

Is Zero free?
Zero is free to download, with in-app purchases available.
Is LadyFast free?
LadyFast is free to download, with in-app purchases available.
Which has better reviews, Zero or LadyFast?
Zero is rated higher. Zero averages 4.8 out of 5 from 445K ratings, while LadyFast averages 1.0 from 1 ratings.
Do Zero or LadyFast have ads?
Neither Zero nor LadyFast shows ads.
Which is updated more often, Zero or LadyFast?
Zero ships an update every 2 weeks, and LadyFast every 3 weeks. Most recently, Zero was updated on November 5, 2026 and LadyFast on October 30, 2026.

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