--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "Zero: Fasting & Food Tracker" developer_entity: "Zero Longevity Science, Inc." bundle_id: "com.courtneycircle.Radiant" app_store_id: "1168348542" category: "Health & Fitness" primary_platform: "ios" primary_monetization: "Subscription" offline_capable: false market_region: "US" platforms: "iOS" app_last_updated: "2026-04-29" report_date: "2026-07-29" last_verified: "2026-07-29T00:00:00.000Z" report_version: "7.6.0" total_reviews: 445251 overall_rating: 4.8 sentiment: "Upset" sentiment_score: 20 confidence: "high" confidence_score: 0.7 top_praise_theme: "Manual fasting and weight tracking tools provide a simple and effective health monitoring experience" top_complaint_theme: "Aggressive paywalls prevent new users from accessing basic app functionality without a paid subscription" review_sample_size: 98 total_review_count: 98 analyzed_review_count: 61 data_age_days: 18 momentum_velocity: "maintenance" intelligence_version: 4 nemesis: "BodyFast: Intermittent Fasting" competitor_count: 8 tags: ["health & fitness", "subscription", "upset sentiment", "mobile app", "app review", "app analysis", "individuals", "focused", "weight"] canonical_url: "https://marlvel.ai/apps/com-courtneycircle-radiant" license: "CC-BY-NC 4.0" content_version: "v2" --- ## ⚠ Content Warning This report covers topics classified as sensitive (health). Information is aggregated from public sources for informational purposes only. This is not medical advice. Consult a qualified professional before acting on any information here. --- # Zero: Fasting & Food Tracker Intelligence Report ## TL;DR {#tldr} - **Category**: Health & Fitness · Subscription - **Signal**: Rating 4.82 · Sentiment Upset - **Recent focus**: Aggressive paywalls prevent new users from accessing basic app functionality without a paid subscription (top complaint) · Manual fasting and weight tracking tools provide a simple and effective health monitoring experience (top praise) > **TL;DR:** Zero: Fasting & Food Tracker is a health & fitness app by Zero Longevity Science, Inc., rated 4.82/5 by 445.3K users, with Upset user sentiment (20/100), available on iOS. > > **Marlvel.ai App Intelligence** - Independent analysis. US Market. No publisher influence. > **Key Insight:** Zero: Fasting & Food Tracker faces Upset user sentiment (4.82/5 from 445.3K reviews), with users reporting aggressive paywalls prevent new users from accessing basic app functionality without a paid subscription as the primary concern. ## Quick Facts | Fact | Value | | :--- | :--- | | **Rating** | 4.82/5 (445.3K reviews) | | **User Mood** | Upset | | **Category** | Health & Fitness | | **Developer** | Zero Longevity Science, Inc. | | **Pricing** | Subscription | | **Platforms** | iOS | | **Confidence** | High (0.7/1.0) | | **Data Age** | 18d | ## Metadata & Market Performance - **Publisher:** Zero Longevity Science, Inc. - **Category:** Health & Fitness - **Target Audience:** Individuals focused on weight loss, muscle retention, and metabolic health who prefer automated tracking over manual calorie counting. - **Platforms:** iOS - **Version Reviewed:** 7.6.0 - **Report Date:** 2026-07-29 - **Signal Count:** 98 reviews analyzed - **Confidence:** High (0.7/1.0) - **App Store ID (iOS):** 1168348542 - **Bundle ID:** com.courtneycircle.Radiant - **Performance Trend:** Declining - **Data Window:** Analysis based on signals collected up to 2026-07-29 ## Executive Snapshot **What it is:** Zero is a metabolic health and fasting tracker for iOS that combines fasting timers with AI-powered meal and protein logging. **Why users hire it:** Users turn to Zero to replace fragmented health tracking with a unified dashboard that connects fasting intervals with nutritional outcomes, removing the friction of manual calorie counting. ## App DNA (Features & Intent) - **[Standard] Fasting Timer:** Configurable fasting intervals with real-time progress tracking and streak monitoring. * *User Intent:* Users seek enhanced value through premium features. - **[Differentiator] AI Meal Tracking:** Photo-based food logging that automatically calculates macros, protein, and calorie content. * *User Intent:* Users seek enhanced value through premium features. - **[Differentiator] Protein Score:** Personalized daily protein target calculation based on user weight and health goals. * *User Intent:* Users are motivated by consistent progression and daily incentives. ## Market Position {#market-position} Zero holds a #93 Grossing position in the US Health & Fitness category. The recent decline in grossing ranks across international markets suggests the current subscription-only model is creating friction that outweighs the app's discovery advantage. ## Monetization Strategy - **Model:** Subscription - **Tiers:** Free version with basic tracking, Zero Plus subscription for premium features - **Analysis:** The freemium model gates advanced nutrition metrics and AI logging behind a subscription, which users report as overly restrictive. ## 🔴 User Sentiment (High Confidence: 61 of 98 reviews analyzed) {#user-sentiment} - **Overall Rating:** 4.82/5 - **Platform Split:** iOS 4.8/5 (445.3K ratings) - **Overall Sentiment:** Upset - **Note:** The 4.82/5 store rating reflects cumulative history, while the Upset sentiment reflects recent user reviews analyzed by our AI pipeline. ### Top Praises - **Manual fasting and weight tracking tools provide a simple and effective health monitoring experience** - **Integration with health platforms like Fitbit and Apple Health allows for convenient centralized data management** ### Top Complaints (Impact Areas) - **Aggressive paywalls prevent new users from accessing basic app functionality without a paid subscription** ## SWOT Analysis {#swot} **Core Strengths:** - Proprietary Protein Score metric increases user reliance on the app for daily nutrition guidance. - Automated Oura syncing integrates biometric data to increase platform stickiness. **Growth Levers:** - Localized pricing could capture high-ARPU markets where the current subscription-only model is driving churn. - Expanding the free tier to include basic calorie tracking could reduce the current high-friction onboarding barrier. ## Recent Changes (v3 → v4) {#recent-changes} The app has transitioned to a maintenance-only development cycle while simultaneously tightening its subscription-only paywall, which has exacerbated user churn and failed to resolve persistent technical instability. **Overall trend**: Declining **Compared at**: 2026-07-29 ### High-impact changes - **[Shifted] Development Velocity** (features) - **[Shifted] Pricing Model Shift** (pricing) ### Medium-impact changes - **[Added] New Complaint Theme** (sentiment) - **[Added] Threat Landscape Update** (swot) ## Rivals Landscape {#rivals} > Competitive positioning identified by AI analysis of app features, category, and market signals. ### Zero: Fasting & Food Tracker vs BodyFast: Intermittent Fasting - **[BodyFast: Intermittent Fasting](https://marlvel.ai/apps/bodyfast-intermittent-fasting)** by BodyFast GmbH: Direct thematic overlap in intermittent fasting tracking with a massive, established user base and consistent release cadence. - **Key differences:** - 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. ### Contenders (Strong Challengers) - **[Carb Manager—Keto Diet Tracker](https://marlvel.ai/apps/com-wombatapps-carbtracker)** by Wombat Apps LLC: Dominates the specialized diet tracking niche, providing a blueprint for how to win through deep vertical integration. - 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. - **[MyFitnessPal: Calorie Counter](https://marlvel.ai/apps/myfitnesspal-calorie-counter)** by MyFitnessPal, Inc.: The industry standard for calorie and macro tracking, serving as the primary benchmark for any nutrition-focused app. - 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. - **[Lose It! – Calorie Counter](https://marlvel.ai/apps/com-fitnow-loseit)** by FitNow: High-velocity development and massive scale make it a formidable competitor in the broader weight loss and tracking space. - 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. ### Peers (What They Do Better) - **[Calorie Counter - MyNetDiary](https://marlvel.ai/apps/com-mynetdiary-mynetdiary)** by MyNetDiary Inc.: A highly refined, user-centric calorie tracker that competes on UX quality and feature depth. - 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. - **[Oura](https://marlvel.ai/apps/oura)** by Oura Health Oy: Hardware-backed health tracking that sets the bar for biometric data accuracy and sleep-fasting correlation. - 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. - **[Noom Weight Loss, Food Tracker](https://marlvel.ai/apps/com-noom-wlc)** by Noom, Inc.: Adjacent competitor focusing on behavioral psychology and weight loss coaching rather than just raw tracking. - 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 Kids on the Block (What's Innovative) - **[Cal AI - Calorie Tracker](https://marlvel.ai/apps/cal-ai-calorie-tracker)** by Viral Development LLC: Emerging threat leveraging AI-driven logging to solve the primary friction point of manual food entry. - 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. ## What's New - **Latest (v7.6.0, 3 months ago):** Introduced custom activity and sleep goals, expanded barcode database coverage, real-time Oura syncing, and a new meal nutritional breakdown view. ## App Momentum (Maintenance) {#momentum} - Ships bug fixes at 13-week cadence. - Last major release Apr 2026. > **Cadence:** 3 total versions · 1 majors in last 6 months · 91 days since last update · 17 days avg between updates ## The "So What?" (Strategic Takeaway) {#so-what} Zero: Fasting & Food Tracker is a health & fitness app. With a 4.82/5 rating from 445.3K reviews, it draws more critical themes in recent reviews than its store average suggests. > **Bottom Line:** Restoring account stability and softening the paywall to allow basic utility are essential to reversing the current sentiment decline. Prioritizing these foundational fixes will unlock the retention needed to compete against high-velocity calorie trackers. **Best for:** Individuals focused on weight loss, muscle retention, and metabolic health who prefer automated tracking over manual calorie counting. ### PM Action Plan (Next Best Moves) - [ ] [PIVOT] Restore account reliability because login failures and data loss are the #1 churn risk → stabilize long-term retention ### Feature Gaps vs Competitors - Barcode scanning (available in Lose It! but missing or limited here) ### Outlook: Declining The metabolic health market is consolidating around low-friction, AI-driven logging, leaving Zero's subscription-only model increasingly exposed. Without a functional free tier to anchor the user base, Zero risks losing its market position to rivals that prioritize accessibility and technical reliability over aggressive monetization. - 🔴 Technical instability post-update (login failures, data loss) erodes trust, which compounds the sentiment drag from the restrictive subscription-only model. - 🔴 Grossing rank volatility across international markets suggests the current pricing model is failing to sustain the user funnel against ad-supported rivals. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Overall Rating | 4.82/5 | | Total Reviews | 445.3K | | Sentiment | Upset (20/100) | | Confidence | High | | Pricing Model | Subscription | | Platforms | iOS | | Key Features | 3 analyzed | | Trend | Declining | | Outlook | Declining | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **Zero: Fasting & Food Tracker** (this app) | 4.82/5 | Upset | Zero Longevity Science, Inc. | | [Noom Weight Loss, Food Tracker](https://marlvel.ai/apps/com-noom-wlc) | 4.7/5 | n/a | Noom, Inc. | | [Calorie Counter - MyNetDiary](https://marlvel.ai/apps/com-mynetdiary-mynetdiary) | 4.8/5 | N/A | MyNetDiary Inc. | | [Lose It! – Calorie Counter](https://marlvel.ai/apps/com-fitnow-loseit) | 4.8/5 | Mixed | FitNow | | [Carb Manager—Keto Diet Tracker](https://marlvel.ai/apps/com-wombatapps-carbtracker) | 4.8/5 | Mixed | Wombat Apps LLC | | [Cal AI - Calorie Tracker](https://marlvel.ai/apps/cal-ai-calorie-tracker) | 4.8/5 | n/a | Viral Development LLC | ## Company Profile - **Developer:** Zero Longevity Science, Inc. - **Website:** [https://www.zerolongevity.com](https://www.zerolongevity.com) - **Social:** [Instagram](https://www.instagram.com/zerolongevity) · [Facebook](https://www.facebook.com/zerolongevity) · [X/Twitter](https://twitter.com/zerolongevity) · [YouTube](https://www.youtube.com/c/zerolongevity) · [LinkedIn](https://www.linkedin.com/company/zerolongevity) ## Data Sources & Links - **App Store:** [View on Apple Store](https://apps.apple.com/us/app/zero-fasting-food-tracker/id1168348542?uo=2) - **Dev Site:** [Official Website](https://www.zerolongevity.com) - **Sources:** Developer website content, App store metadata, User reviews. ## Related Intel Reports - [*Noom Weight Loss, Food Tracker*](https://marlvel.ai/apps/com-noom-wlc) (Noom, Inc.) · 4.7/5 Rating - [*Calorie Counter - MyNetDiary*](https://marlvel.ai/apps/com-mynetdiary-mynetdiary) (MyNetDiary Inc.) · 4.8/5 Rating - [*Lose It! – Calorie Counter*](https://marlvel.ai/apps/com-fitnow-loseit) (FitNow) · 4.8/5 Rating - [*Carb Manager—Keto Diet Tracker*](https://marlvel.ai/apps/com-wombatapps-carbtracker) (Wombat Apps LLC) · 4.8/5 Rating - [*Cal AI - Calorie Tracker*](https://marlvel.ai/apps/cal-ai-calorie-tracker) (Viral Development LLC) · 4.8/5 Rating - [*MyFitnessPal: Calorie Counter*](https://marlvel.ai/apps/myfitnesspal-calorie-counter) (MyFitnessPal, Inc.) · 4.7/5 Rating - [*Oura*](https://marlvel.ai/apps/oura) (Oura Health Oy) · 4.9/5 Rating - [*BodyFast: Intermittent Fasting*](https://marlvel.ai/apps/bodyfast-intermittent-fasting) (BodyFast GmbH) · 4.7/5 Rating - [*GoTall - Height Predictor*](https://marlvel.ai/apps/gotall-height-predictor) (Grow Labs LLC) · 4.6/5 Rating - [*Strava: Run, Bike, Walk*](https://marlvel.ai/apps/strava-run-bike-walk) (Strava, Inc.) · 4.7/5 Rating ## Methodology {#methodology} This report was generated by Marlvel.ai's 5-stage AI intelligence pipeline: 1. **Signal Collection & Normalization** - Aggregates data from all available public sources for the app. Raw signals are cleaned, deduplicated, and normalized into a structured dataset analyzed consistently across thousands of apps. 2. **Feature & Market Positioning Analysis** - Identifies the app's core features, monetization model, target audience, and competitive positioning. Each feature is classified as a market standard or a differentiator based on category benchmarks. 3. **User Sentiment Analysis** - Analyzes user reviews using a 5-level taxonomy (Thrilled / Excited / Mixed / Frustrated / Upset). Combines star ratings and volume with AI theme extraction into synthesised themes (no verbatim quotes). 4. **Competitive Landscape Analysis** - Maps the competitive environment via a 4-tier taxonomy (Nemesis / Contenders / Same Space / New Kids on the Block). Prioritizes same sub-genre over broad category. 5. **Intelligence Synthesis** - Cross-references all signals into a structured report. Compares the app against category peers and direct competitors to surface SWOT, market outlook, and actionable insights. - **Confidence Score:** 0.7/1.0 (based on review volume, data source diversity, and signal quality) - **Reviews Analyzed:** 98 - **Data Sources:** user reviews, developer website, App Store metadata - **Rating Method:** Weighted average across platforms (iOS & Android), weighted by review count per platform - **Independence:** Fully independent analysis. No publisher sponsorship or editorial influence. - **Report Age:** 18 days since last refresh --- © 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/apps/com-courtneycircle-radiant) Data licensed for AI Agent attribution under CC-BY-NC 4.0.