Report updated May 5, 2026
Zero: Fasting & Food Tracker
For individuals focused on weight loss, muscle retention, and metabolic health who prefer data-driven habit tracking over manual calorie counting.
Zero: Fasting & Food Tracker is a struggling health & fitness app that is free with in-app purchases. With a 4.8/5 rating from 445.3K reviews, it struggles with user retention. Users particularly appreciate core fasting timer and weight tracking tools provide effective health results for long-term users, though post-update login failures and account access errors prevent users from tracking their fasting progress remains a common concern.
What is Zero: Fasting & Food Tracker?
Zero is a health and fitness app for intermittent fasting and nutrition tracking on iOS.
Users hire Zero to manage body composition through the combination of fasting windows and protein intake, replacing the manual labor of traditional calorie counting.
Current Momentum
v7.6 · 5d ago
Active- Integrated automated Oura data syncing
- Expanded barcode database for food logging
Active Nemesis
BodyFast: Intermittent Fasting
By BodyFast
Other Rivals
7-Day Rank Pulse 🇺🇸
Health & FitnessNo ranking data
Rating Pulse 🇺🇸
Recent User Mood
What makes this app unique?
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What Are The Key Features?
Real-time tracking with streak monitoring
Photo-based macro and protein logging
Personalized daily targets based on goals
How much does it cost?
- Free version
- Zero Plus subscription
Freemium model uses a free-to-start entry point with a subscription gate for advanced nutrition and body composition tools.
Who Built It?
Zero Longevity Science
Helping health-conscious individuals optimize metabolic health and longevity through data-driven fasting and nutrition tracking.
Portfolio
3
Apps
What other apps does Zero Longevity Science make?
Explore the full Zero Longevity Science report
Portfolio breakdown, audience, momentum, and every app published by Zero Longevity Science.
What do users think recently?
High confidence · 98 reviews analyzed · Based on 98 reviews. Signal may be noisy.
How did the latest release land?
What is the recent mood?
Recent user voice shows a upset sentiment. Users appreciate core fasting timer and weight tracking tools provide effective health results for long-term users, but report post-update login failures and account access errors prevent users from tracking their fasting progress.
What Users Love
What Frustrates Users
What Users Want
View the full user-sentiment analysis
Mood gauge, ratings & review-volume history, every praise / complaint / request, and sentiment over time.
What is the competitive landscape for Zero: Fasting & Food Tracker?
How's The Health & Fitness Market?
How does it evolve in the Health & Fitness market?
Zero holds the #98 Grossing position in the US Health & Fitness category. The recent rank drop of 8 spots indicates that technical instability is impacting monetization velocity.
Rank progression
102 active rankings tracked — 30-day window
The rivals identified
Nemeses(1)
Direct thematic overlap in intermittent fasting tracking with a massive, established user base and consistent release cadence.
Differentiators
- Offers highly structured, coach-led fasting plans that guide users through specific protocols daily.
- Provides a dedicated fasting-focused community experience that encourages long-term adherence through social accountability.
- Monetization model relies heavily on premium coaching plans rather than just basic tracking features.
Head to head
Target must double down on its 'full picture' nutrition integration to differentiate from BodyFast's rigid, coach-led fasting focus.
Contenders(3)
Dominates the specialized diet tracking niche, providing a blueprint for how to win through deep vertical integration.
Differentiators
- Hyper-focused on keto-specific macro tracking, including net carb calculations that general trackers often overlook.
- Includes a robust recipe and meal planning engine that provides actionable value beyond simple data entry.
The industry standard for calorie and macro tracking, serving as the primary benchmark for any nutrition-focused app.
Differentiators
- Unmatched food database scale provides near-instant search results for almost any global food item.
- Deep integration with hundreds of third-party fitness trackers and wearable devices creates a massive data moat.
High-velocity development and massive scale make it a formidable competitor in the broader weight loss and tracking space.
Differentiators
- Extensive food database with barcode scanning capabilities that significantly reduces the friction of daily logging.
- Aggressive release schedule of 29 updates in six months demonstrates rapid iteration and feature responsiveness.
Same space(3)
A highly refined, user-centric calorie tracker that competes on UX quality and feature depth.
Differentiators
- Offers a highly polished, ad-free experience that prioritizes user privacy and interface speed.
- Includes specialized tracking for diabetes and other medical conditions, expanding its utility beyond general weight loss.
Hardware-backed health tracking that sets the bar for biometric data accuracy and sleep-fasting correlation.
Differentiators
- Leverages proprietary ring hardware to provide passive, high-fidelity biometric data without manual user input.
- Advanced sleep and readiness scoring provides a context-aware health picture that manual trackers cannot replicate.
Adjacent competitor focusing on behavioral psychology and weight loss coaching rather than just raw tracking.
Differentiators
- Uses a curriculum-based approach to change eating habits through daily lessons and psychological reinforcement.
- High-touch human coaching model provides a premium service layer that standard trackers lack.
New entrants(1)
Emerging threat leveraging AI-driven logging to solve the primary friction point of manual food entry.
Differentiators
- Uses computer vision to identify food items from photos, eliminating the need for manual database searching.
- AI-powered calorie estimation reduces the time-to-log for users who find traditional trackers too tedious.
Compare Zero: Fasting & Food Tracker against every rival
All rivals in one side-by-side table — identity, store metrics, ratings & sentiment, and strategic intel — plus a head-to-head page for each.
The outtake for Zero: Fasting & Food Tracker
Strengths to defend, gaps to attack
Core Strengths
- Oura integration increases switching costs via biometric data
- Protein-focused nutrition logic differentiates from generic calorie trackers
Critical Frictions
- Login failures post-update disrupt daily habits
- Premium tier pricing exceeds category median
Growth Levers
- B2B partnerships with metabolic health clinics
- Expansion of macro tracking to include fiber and fats
Market Threats
- Technical instability driving users to BodyFast
- AI-driven logging in Cal AI reducing manual entry friction
What are the next best moves?
Stabilize authentication flow because login failures are the top complaint → restore daily active usage
Login failures and account access errors are the primary drivers of recent negative sentiment.
Trade-off: Pause the new macro-tracking feature development — stability is the prerequisite for retention.
Restore free-tier access to basic fasting timers because paywall complaints are driving churn → reduce deletion rate
Aggressive paywall implementation is cited as a primary reason for deleting the application.
Trade-off: Deprioritize the premium-only challenge feature rollout — user base retention is the priority.
A counter-intuitive read
The app's #98 grossing rank is a lagging indicator; the real risk is that the current technical instability is permanently damaging the brand's reputation among long-term, high-value users.
Feature Gaps vs Competitors
- Real-time coaching plans (available in BodyFast)
- Extensive barcode database (available in Lose It!)
Key Takeaways
Zero maintains a strong position through its protein-tracking differentiator, but the recent technical instability and paywall shift are accelerating churn, so the PM must prioritize authentication stability and restore free-tier value to prevent further rank erosion.
Where Is It Heading?
Declining
The health tracking market is consolidating around apps that offer low-friction logging and high reliability. Zero's current technical instability and restrictive paywall leave it exposed to competitors like BodyFast, which offer more predictable user experiences.
Login failures post-update prevent users from accessing their data, which directly triggers high-churn behavior and negative reviews.
Aggressive paywall shifts are alienating the long-term user base, leading to a decline in grossing rank as users migrate to competitors.