--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "Vitamin K" developer_entity: "James Hollender" bundle_id: "com.hollender.VitaminK" app_store_id: "393118621" google_play_id: "com.eduven.cc.vitaminK" category: "Medical" primary_platform: "ios" primary_monetization: "Paid" offline_capable: false market_region: "US" platforms: "iOS & Android" app_last_updated: "2025-12-06" report_date: "2026-04-12" report_version: "7.0" total_reviews: 10 overall_rating: 3 sentiment: "Mixed" sentiment_score: 55 confidence: "high" confidence_score: 0.55 data_age_days: 0 intelligence_version: 2 nemesis: "ClotKeeper" competitor_count: 5 tags: ["medical", "paid", "mixed sentiment", "mobile app", "app review", "app analysis", "individuals", "prescribed", "blood-thinning"] canonical_url: "https://marlvel.ai/intel-report/medical/com-hollender-vitamink" license: "CC-BY-NC 4.0" --- # Vitamin K App Audit > **TL;DR:** Vitamin K is a medical app by James Hollender, rated 3/5 by 10 users, with Mixed user sentiment (55/100), available on iOS & Android. > > **Marlvel.ai App Intelligence** — Independent analysis. US Market. No publisher influence. > **Key Insight:** Vitamin K shows Mixed sentiment (3/5 from 10 reviews) — users praise utility for vitamin k tracking but report issues with app stability and crashing. ## Quick Facts | Fact | Value | | :--- | :--- | | **Rating** | 3/5 (10 reviews) | | **User Mood** | Mixed | | **Category** | Medical | | **Developer** | James Hollender | | **Pricing** | Paid | | **Platforms** | iOS & Android | | **Confidence** | High (0.55/1.0) | | **Data Age** | 0d | ## Metadata & Market Performance - **Publisher:** James Hollender - **Category:** Medical - **Target Audience:** Individuals prescribed blood-thinning medications like Warfarin or Coumadin who need to monitor and manage their dietary Vitamin K intake. - **Platforms:** iOS & Android - **Version Audited:** 7.0 - **Audit Date:** 2026-04-12 - **Signal Count:** 10 reviews analyzed - **Confidence:** High (0.55/1.0) - **App Store ID (iOS):** 393118621 - **Bundle ID:** com.hollender.VitaminK - **Google Play ID:** com.eduven.cc.vitaminK - **Data Window:** Analysis based on signals collected up to 2026-04-12 ## Executive Snapshot Vitamin K is a medical utility app for patients on anticoagulants, providing a USDA-based database of 930+ foods. It differentiates itself through a unique 9-color risk scale for quick nutrient identification. While it serves a critical niche, the app faces significant stability issues and competition from more modern, integrated platforms like ClotKeeper. ## App DNA (Features & Intent) - **[Standard] Vitamin K Content Database:** Comprehensive database of over 930 foods with specific Vitamin K content in mcg, sourced from USDA data. - **[Differentiator] Color-Coded Risk Scale:** Visual indicator system (9-color scale) to quickly identify the Vitamin K level of food items. - **[Standard] Intake Tracking:** Record daily food intake with the ability to edit servings, dates, and copy records between days. * *User Intent:* Users are motivated by consistent progression and daily incentives. - **[Differentiator] Custom Serving Creation:** Allows users to input and save custom food servings not found in the standard database. * *User Intent:* Users value self-expression and personalized experiences. - **[Standard] Advanced Search:** Search functionality supporting two-word phrases with logical operators (AND, OR, BUT NOT). * *User Intent:* Users want to quickly find relevant content or features. ## Monetization Strategy - **Model:** Paid - **Tiers:** One-time purchase of $2.99 for the iOS version - **Price:** iOS: $2.99 - **Analysis:** The developer utilizes a straightforward, one-time purchase model for the iOS app, positioning it as a specialized medical utility rather than a subscription-based service. ## 🟡 User Sentiment (High Confidence: 10 reviews) - **Overall Rating:** 3/5 - **Platform Split:** iOS 3.0/5 (10 ratings) - **Overall Sentiment:** Mixed ### Top Praises - **Utility for Vitamin K Tracking** | *Evidence:* "Great app that works offline. Color coding makes it a breeze to understand." - **Offline Functionality** | *Evidence:* "Great app that works offline. No internet required." ### Top Complaints (Impact Areas) - **App Stability and Crashing** | *Evidence:* "It won't even open anymore." - **Poor Usability and Navigation** | *Evidence:* "The search was unintuitive and the app didn’t have the food I wanted" ## SWOT Analysis **Core Strengths:** - Highly granular 9-color risk scale - Advanced search with logical operators - Full offline functionality - USDA-sourced data integrity **Critical Frictions:** - High-frequency crashing on iOS - Legacy iOS codebase (2019) - Unintuitive intake logging navigation - Lack of cloud synchronization **Growth Levers:** - Integration of INR tracking - Barcode scanner implementation - Migration of users to the newer 'INR Assist' platform **Market Threats:** - Modern nutrition trackers (Cronometer) with superior UX - Competitors offering integrated medication reminders - Platform obsolescence due to lack of iOS updates ## Rivals Landscape > Competitive positioning identified by AI analysis of app features, category, and market signals. ### Vitamin K vs ClotKeeper — Head to Head - **ClotKeeper** by ClotKeeper LLC: ClotKeeper is the most direct functional rival, specifically designed for patients on anticoagulants to track both INR levels and dietary Vitamin K intake. - **Key differences:** - Integrated INR tracking alongside dietary logging for a more holistic anticoagulant management view - Graphing capabilities to visualize the correlation between Vitamin K intake and INR fluctuations - Cloud synchronization features which are absent in the analyzed app's legacy architecture - **Publisher (ClotKeeper LLC) strengths:** Specialized focus on the anticoagulant patient niche; Maintains a more modern codebase with more recent updates than the target app - **Where Vitamin K wins:** - ✅ Highly granular 9-color risk scale for immediate visual identification of Vitamin K levels - ✅ Extensive search functionality supporting logical operators (AND, OR, BUT NOT) for complex food queries - **Where ClotKeeper wins:** - ❌ More frequent update cycle ensuring compatibility with modern iOS versions - ❌ Broader feature set including INR value recording and medication reminders - **Verdict:** ClotKeeper has the strategic edge due to its more recent maintenance and the inclusion of INR tracking, which is the primary clinical metric for the target audience. While Vitamin K offers superior search logic, its 2019 update status makes it a 'legacy' choice compared to ClotKeeper. ### Contenders (Strong Challengers) - **Warfarin Guide** by Salty Crane: A direct utility competitor that focuses exclusively on the Vitamin K content of foods for Warfarin patients. - Simplified list-based interface focused on quick lookups rather than long-term intake logging - Categorization based on common serving sizes specifically tailored for quick dietary decisions ### Peers (What They Do Better) - **Cronometer** by Cronometer Software Inc.: While a broad nutrition tracker, it is the primary choice for power users who require high-accuracy micronutrient data, including Vitamin K1 and K2. - Uses lab-analyzed data sources (NCCDB) which are often more detailed than standard USDA entries - Tracks a massive range of vitamins and minerals beyond just Vitamin K - **MyNetDiary** by MyNetDiary.com: A comprehensive calorie and nutrient tracker that includes Vitamin K monitoring as part of its premium health tracking suite. - Robust barcode scanner for branded food items, which the analyzed app lacks - Integration with Apple Health and wearable devices ### New Kids on the Block (What's Innovative) - **INR Log** by Nordlogic: A modern, streamlined alternative for tracking anticoagulant data with a focus on ease of use and mobile-first design. - Modern iOS design language and gesture-based navigation - Simplified data entry specifically optimized for elderly users or those with limited dexterity ## The "So What?" (Strategic Takeaway) Vitamin K is an established medical app that is a paid app. With a 3/5 rating from 10 reviews, it shows polarized user reception. > **Bottom Line:** Vitamin K is a high-utility legacy app currently suffering from critical technical debt. While its color-coded database remains a strong differentiator, the lack of INR tracking and persistent crashing on iOS makes it vulnerable to modern competitors like ClotKeeper. **Best for:** Individuals prescribed blood-thinning medications like Warfarin or Coumadin who need to monitor and manage their dietary Vitamin K intake. ### PM Action Plan (Next Best Moves) - [ ] [HIGH] Prioritize iOS stability patch — *App stability/crashing is the #1 complaint theme, leading to a 'Mixed' mood and 3.0-star rating.* - [ ] [HIGH] Integrate INR tracking functionality — *Nemesis (ClotKeeper) wins by offering a holistic view of both INR and Vitamin K, which is the primary clinical need.* - [ ] [MEDIUM] Streamline the intake logging UI — *Users reported the app is 'difficult to use' for daily recording, which is a medium-frequency usability complaint.* ### Feature Gaps vs Competitors - Integrated INR tracking (available in ClotKeeper) - Cloud synchronization (available in ClotKeeper) - Medication reminders (available in ClotKeeper) - Barcode scanner (available in MyNetDiary) ### Outlook: Mixed - 🟢 Android version updated Dec 2025 — indicates active maintenance on at least one platform. - 🔴 iOS version last updated Dec 2019 — legacy status creates compatibility risks. - 🔴 High-frequency crash reports in sentiment data — significant technical debt impacting retention. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Overall Rating | 3/5 | | Total Reviews | 10 | | Sentiment | Mixed (55/100) | | Confidence | High | | Pricing Model | Paid | | Platforms | iOS & Android | | Key Features | 5 analyzed | | Outlook | Mixed | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **Vitamin K** (this app) | 3/5 | Mixed | James Hollender | | [FHO+ Calc](https://marlvel.ai/intel-report/medical/ca-fhocalc-app) | N/A/5 | N/A | Manu Kaushik | | [MyBaby Milestones Baby Tracker](https://marlvel.ai/intel-report/medical/mybaby-milestones-baby-tracker) | 4.6/5 | N/A | Sebastien Menozzi | | [ASE TTE](https://marlvel.ai/intel-report/medical/com-redpixelstudios-medmovie-ase-tte) | N/A/5 | N/A | Medmovie, Inc. | | [Total Reflexology-3D](https://marlvel.ai/intel-report/medical/com-acupuncturelearning-totalreflexology) | 4.0/5 | N/A | GraphicVizion | | [CardioGenetics](https://marlvel.ai/intel-report/medical/com-scd-risk-calculator) | N/A/5 | N/A | MARK EMILE PEPIN | ## Company Profile - **Developer:** James Hollender - **Website:** [https://www.hollender.com/VitaminK.html](https://www.hollender.com/VitaminK.html) ## Data Sources & Links - **App Store:** [View on Apple Store](https://apps.apple.com/us/app/vitamin-k/id393118621?uo=2) - **Google Play:** [View on Google Play](https://play.google.com/store/apps/details?id=com.eduven.cc.vitaminK&hl=en&gl=us) - **Dev Site:** [Official Website](https://www.hollender.com/VitaminK.html) - **Sources:** Developer website content, App store metadata, User reviews. ## Related Intel Reports - [*FHO+ Calc*](https://marlvel.ai/intel-report/medical/ca-fhocalc-app) (Manu Kaushik) — N/A Rating | N/A Sentiment - [*MyBaby Milestones Baby Tracker*](https://marlvel.ai/intel-report/medical/mybaby-milestones-baby-tracker) (Sebastien Menozzi) — 4.6/5 Rating | N/A Sentiment - [*ASE TTE*](https://marlvel.ai/intel-report/medical/com-redpixelstudios-medmovie-ase-tte) (Medmovie, Inc.) — N/A Rating | N/A Sentiment - [*Total Reflexology-3D*](https://marlvel.ai/intel-report/medical/com-acupuncturelearning-totalreflexology) (GraphicVizion) — 4.0/5 Rating | N/A Sentiment - [*CardioGenetics*](https://marlvel.ai/intel-report/medical/com-scd-risk-calculator) (MARK EMILE PEPIN) — N/A Rating | N/A Sentiment - [*My F1rst Steps*](https://marlvel.ai/intel-report/medical/com-myfirststeps-www) (My First Steps LLC) — 5.0/5 Rating | N/A Sentiment - [*Mobile VSO : Claims Guide*](https://marlvel.ai/intel-report/medical/app-replit-mobilevso) (ANDREW THOMAS COOLEY) — 5.0/5 Rating | N/A Sentiment - [*Protectometer*](https://marlvel.ai/intel-report/medical/protectometer) (noigroup) — 2.0/5 Rating | N/A Sentiment - [*Beat Social Phobia with AJ*](https://marlvel.ai/intel-report/medical/beat-social-phobia-with-aj) (Universal Relaxation Ltd) — 3.9/5 Rating | Excellent Sentiment - [*Accredo*](https://marlvel.ai/intel-report/medical/com-accredohealth-accredo-mobile) (Accredo Health Group, Inc) — 4.8/5 Rating | Positive Sentiment ## Methodology This report was generated by Marlvel.ai's 3-stage AI intelligence pipeline: 1. **Feature & Positioning Extraction** — Analyzes app metadata, developer website content, and version history to identify key features, target audience, and competitive positioning. 2. **Sentiment Analysis** — Processes user reviews (minimum 5 reviews required) to extract praise themes, complaint themes, and overall sentiment with evidence quotes. 3. **Intelligence Synthesis** — Combines stages 1 & 2 with App Store rankings to produce SWOT analysis, executive summary, and actionable insights. - **Confidence Score:** 0.55/1.0 (based on review volume, data source diversity, and signal quality) - **Reviews Analyzed:** 10 - **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/medical/com-hollender-vitamink) Data licensed for AI Agent attribution under CC-BY-NC 4.0.