Zero: Fasting & Food Tracker
v7.4.0Health-conscious individuals and intermittent fasters focused on sustainable weight loss, muscle preservation, and metabolic health through data-driven nutrition.
What Is Zero: Fasting & Food Tracker?
Launched Dec 23, 2016
Updated Mar 2026
What users think
Key Features
Customizable fasting timers with streak tracking and personalized insights.
Photo-based meal entry providing instant macro and protein analysis via AI.
Adaptive daily protein targets based on weight and goals to support muscle retention.
Educational content from experts on fasting, protein, and metabolic health.
Recent User Sentiment
“Recent user voice shows a frustrated sentiment. Users appreciate all-in-one functionality and clean ui and navigation, but report aggressive paywall & forced trials and inaccurate ai food logging.”
What Users Love
No need for multiple apps to track different things now everything is in one place
The layout is clean and clear, it was quick and easy to get started
Pain Points
I can’t even try the free version without signing up for a free trial. Fast delete.
The app FORCES you to sign up for a trial... there’s no x button
Showed coffee to have 117 grams of protein. 40 calories.
High confidence · 445.2K reviews available
App Store Performance
| Chart | Rank | Change |
|---|---|---|
| Grossing | #78 | ▼3 |
Pros and Cons
Pros
- Strong brand authority in the fasting niche
- Premium UI/UX design
- Unique focus on Protein Score and muscle retention
- Large historical user base and high lifetime rating
Cons
- High-friction onboarding (forced trials)
- Inaccurate AI-driven calorie/macro counting
- Technical bugs in notification and timer persistence
- Negative recent sentiment trend
Market Outlook
Growth Opportunities
- Capture users from competitors by offering a more transparent free tier
- Improve AI accuracy to solidify the 'Smart Logging' differentiator
- Expand into B2B longevity and wellness markets
- Integrate with advanced metabolic wearables (CGMs)
Market Threats
- Competitors with lower-friction onboarding and better free features
- Long-term brand damage from aggressive monetization
- AI-first nutrition apps with superior database accuracy
Key Takeaways
Zero: Fasting & Food Tracker is a frustrating health & fitness app that is free with in-app purchases. With a 4.8/5 rating from 445.2K reviews, it frustrates many users from users. Users particularly appreciate all-in-one functionality, though aggressive paywall & forced trials remains a common concern.
Best for: Health-conscious individuals and intermittent fasters focused on sustainable weight loss, muscle preservation, and metabolic health through data-driven nutrition.
App Details & Pricing
Model: freemium
Zero uses a high-friction monetization strategy, gating advanced features like the Protein Score and AI logging behind a subscription, while aggressively pushing a trial during onboarding.