## ⚠ 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. --- --- 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: "Freemium" offline_capable: false market_region: "US" platforms: "iOS" app_last_updated: "2026-04-29" report_date: "2026-05-05" report_version: "7.6.0" total_reviews: 445251 overall_rating: 4.82 sentiment: "Upset" sentiment_score: 15 confidence: "high" confidence_score: 0.7 top_praise_theme: "Core fasting timer and weight tracking tools provide effective health results for long-term users" top_complaint_theme: "Post-update login failures and account access errors prevent users from tracking their fasting progress" top_request_theme: "Restoration of a functional free tier to allow basic fasting and weight tracking usage" review_sample_size: 98 total_review_count: 98 analyzed_review_count: 98 data_age_days: 0 momentum_velocity: "active" intelligence_version: 3 nemesis: "BodyFast: Intermittent Fasting" competitor_count: 8 tags: ["health & fitness", "freemium", "upset sentiment", "mobile app", "app review", "app analysis", "individuals", "focused", "weight"] canonical_url: "https://marlvel.ai/intel-report/health-fitness/com-courtneycircle-radiant" license: "CC-BY-NC 4.0" content_version: "v2" --- # Zero: Fasting & Food Tracker App Audit ## TL;DR {#tldr} - **Category**: Health & Fitness · Freemium - **Signal**: Rating 4.82 · Sentiment Upset - **Recent focus**: Post-update login failures and account access errors prevent users from tracking their fasting progress (top complaint) · Core fasting timer and weight tracking tools provide effective health results for long-term users (top praise) · Restoration of a functional free tier to allow basic fasting and weight tracking usage (top request) > **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 (15/100), 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 post-update login failures and account access errors prevent users from tracking their fasting progress as the primary user concern. ## Quick Facts | Fact | Value | | :--- | :--- | | **Rating** | 4.82/5 (445.3K reviews) | | **User Mood** | Upset | | **Category** | Health & Fitness | | **Developer** | Zero Longevity Science, Inc. | | **Pricing** | Freemium | | **Platforms** | iOS | | **Confidence** | High (0.7/1.0) | | **Data Age** | 0d | ## 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 data-driven habit tracking over manual calorie counting. - **Platforms:** iOS - **Version Audited:** 7.6.0 - **Audit Date:** 2026-05-05 - **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 2026-05-05 ## Executive Snapshot **What it is:** Zero is a health and fitness app for intermittent fasting and nutrition tracking on iOS. **Why users hire it:** Users hire Zero to manage body composition through the combination of fasting windows and protein intake, replacing the manual labor of traditional calorie counting. ## App DNA (Features & Intent) - **[Standard] Fasting Timer:** Real-time tracking with streak monitoring * *User Intent:* Users want visibility into their own performance and progress. - **[Differentiator] AI Meal Tracking:** Photo-based macro and protein logging * *User Intent:* Users seek enhanced value through premium features. - **[Differentiator] Protein Score:** Personalized daily targets based on goals * *User Intent:* Users are motivated by consistent progression and daily incentives. ## Market Position {#market-position} 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. ## Monetization Strategy - **Model:** Freemium - **Tiers:** Free version, Zero Plus subscription - **Analysis:** Freemium model uses a free-to-start entry point with a subscription gate for advanced nutrition and body composition tools. ## 🔴 User Sentiment (High Confidence: 98 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 - **Core fasting timer and weight tracking tools provide effective health results for long-term users** ### Top Complaints (Impact Areas) - **Post-update login failures and account access errors prevent users from tracking their fasting progress** ### Top Requests (What Users Want) - **Restoration of a functional free tier to allow basic fasting and weight tracking usage** ## SWOT Analysis {#swot} **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 ## Recent Changes (v2 → v3) {#recent-changes} The app is experiencing a decline in user trust and grossing rank due to post-update technical failures and persistent paywall friction, despite the addition of new biometric integrations. **Overall trend**: Declining **Compared at**: 2026-05-05 ### High-impact changes - **[Declined] Sentiment Score Drop** (sentiment) — Sentiment score fell from 32 to 15, with overall sentiment moving from negative to terrible. - **[Added] Critical Login Failures** (sentiment) — New complaints regarding post-update login failures and account lockouts have emerged as the primary user issue. - **[Removed] Mandatory Trial Tier Removal** (pricing) — The mandatory free trial tier was removed from the listed pricing tiers, though paywall friction remains a top user complaint. ### Medium-impact changes - **[Declined] Grossing Rank Erosion** (positioning) — Grossing rank declined from #78 to #98, attributed to technical instability. - **[Added] Biometric Integration** (features) — Added automated Oura data syncing to increase switching costs. ## Rivals Landscape {#rivals} > Competitive positioning identified by AI analysis of app features, category, and market signals. ### Zero: Fasting & Food Tracker vs BodyFast: Intermittent Fasting — Head to Head - **[BodyFast: Intermittent Fasting](https://marlvel.ai/intel-report/health-fitness/bodyfast-intermittent-fasting)** by BodyFast GmbH: Direct thematic overlap in intermittent fasting tracking with a massive, established user base and consistent release cadence. - **Moat strength:** Medium — durable but contestable - **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. - **Where Zero: Fasting & Food Tracker wins:** - ✅ Integrates broader health metrics like protein and hydration tracking to provide a holistic body composition view. - ✅ Focuses on a more modern, clean interface that prioritizes ease of use for daily habit logging. - **Where BodyFast: Intermittent Fasting wins:** - ❌ Deep library of pre-set fasting schedules reduces the cognitive load for beginners starting their journey. - ❌ Established community features create a social feedback loop that keeps users engaged within the app ecosystem. - **Verdict:** Target must double down on its 'full picture' nutrition integration to differentiate from BodyFast's rigid, coach-led fasting focus. ### Contenders (Strong Challengers) - **[Lose It! – Calorie Counter](https://marlvel.ai/intel-report/health-fitness/com-fitnow-loseit)** by FitNow [Moat: High]: 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. - **[MyFitnessPal: Calorie Counter](https://marlvel.ai/intel-report/health-fitness/myfitnesspal-calorie-counter)** by MyFitnessPal, Inc. [Moat: High]: 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. - **[Carb Manager—Keto Diet Tracker](https://marlvel.ai/intel-report/health-fitness/com-wombatapps-carbtracker)** by Wombat Apps LLC [Moat: Medium]: 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. ### Peers (What They Do Better) - **[Noom Weight Loss, Food Tracker](https://marlvel.ai/intel-report/health-fitness/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. - **[Oura](https://marlvel.ai/intel-report/health-fitness/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. - **[Calorie Counter - MyNetDiary](https://marlvel.ai/intel-report/health-fitness/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. ### New Kids on the Block (What's Innovative) - **[Cal AI - Calorie Tracker](https://marlvel.ai/intel-report/health-fitness/cal-ai-calorie-tracker)** by Viral Development LLC: Emerging threat leveraging AI-driven logging to solve the primary friction point of manual food entry. ## What's New - **Latest (v7.6.0, 5 days ago):** Added custom activity/sleep goals, meal nutritional breakdowns, expanded barcode database, and real-time Oura sync. ## App Momentum (Active) {#momentum} - Integrated automated Oura data syncing - Expanded barcode database for food logging > **Cadence:** 3 total versions · 2 majors in last 6 months · 5 days since last update · 17 days avg between updates ## The "So What?" (Strategic Takeaway) {#so-what} Zero: Fasting & Food Tracker is a challenged health & fitness app that is free with in-app purchases. With a 4.82/5 rating from 445.3K reviews, it faces significant user friction. > **Bottom Line:** 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. **Best for:** Individuals focused on weight loss, muscle retention, and metabolic health who prefer data-driven habit tracking over manual calorie counting. ### PM Action Plan (Next Best Moves) - [ ] [INVEST] [HIGH IMPACT] 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: deprioritize Pause the new macro-tracking feature development — stability is the prerequisite for retention.)_ - [ ] [PIVOT] [HIGH IMPACT] 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 Deprioritize the premium-only challenge feature rollout — user base retention is the priority.)_ ### Feature Gaps vs Competitors - Real-time coaching plans (available in BodyFast) - Extensive barcode database (available in Lose It!) ### Outlook: 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. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Overall Rating | 4.82/5 | | Total Reviews | 445.3K | | Sentiment | Upset (15/100) | | Confidence | High | | Pricing Model | Freemium | | 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/intel-report/health-fitness/com-noom-wlc) | 4.7/5 | N/A | Noom, Inc. | | [Calorie Counter - MyNetDiary](https://marlvel.ai/intel-report/health-fitness/com-mynetdiary-mynetdiary) | 4.8/5 | N/A | MyNetDiary Inc. | | [Lose It! – Calorie Counter](https://marlvel.ai/intel-report/health-fitness/com-fitnow-loseit) | 4.8/5 | Mixed | FitNow | | [Carb Manager—Keto Diet Tracker](https://marlvel.ai/intel-report/health-fitness/com-wombatapps-carbtracker) | 4.8/5 | Mixed | Wombat Apps LLC | | [Cal AI - Calorie Tracker](https://marlvel.ai/intel-report/health-fitness/cal-ai-calorie-tracker) | 4.8/5 | Upset | 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/intel-report/health-fitness/com-noom-wlc) (Noom, Inc.) — 4.7/5 Rating | N/A Sentiment - [*Calorie Counter - MyNetDiary*](https://marlvel.ai/intel-report/health-fitness/com-mynetdiary-mynetdiary) (MyNetDiary Inc.) — 4.8/5 Rating | N/A Sentiment - [*Lose It! – Calorie Counter*](https://marlvel.ai/intel-report/health-fitness/com-fitnow-loseit) (FitNow) — 4.8/5 Rating | Mixed Sentiment - [*Carb Manager—Keto Diet Tracker*](https://marlvel.ai/intel-report/health-fitness/com-wombatapps-carbtracker) (Wombat Apps LLC) — 4.8/5 Rating | Mixed Sentiment - [*Cal AI - Calorie Tracker*](https://marlvel.ai/intel-report/health-fitness/cal-ai-calorie-tracker) (Viral Development LLC) — 4.8/5 Rating | Terrible Sentiment - [*MyFitnessPal: Calorie Counter*](https://marlvel.ai/intel-report/health-fitness/myfitnesspal-calorie-counter) (MyFitnessPal, Inc.) — 4.7/5 Rating | Mixed Sentiment - [*Oura*](https://marlvel.ai/intel-report/health-fitness/oura) (Oura Health Oy) — 4.9/5 Rating | Mixed Sentiment - [*BodyFast: Intermittent Fasting*](https://marlvel.ai/intel-report/health-fitness/bodyfast-intermittent-fasting) (BodyFast GmbH) — 4.7/5 Rating | N/A Sentiment - [*Taller AI: Height Maximizer*](https://marlvel.ai/intel-report/health-fitness/taller-ai-height-maximizer) (Leadimize) — 4.7/5 Rating | Positive Sentiment - [*GoTall - Height Predictor*](https://marlvel.ai/intel-report/health-fitness/gotall-height-predictor) (Super Viral Studio) — 4.6/5 Rating | Positive Sentiment ## 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 and evidence quoting. 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:** 0 days since last refresh --- © 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/intel-report/health-fitness/com-courtneycircle-radiant) Data licensed for AI Agent attribution under CC-BY-NC 4.0.