--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "NPK Calculator" developer_entity: "Anton Simonov" bundle_id: "VG.Grow-Calculator" app_store_id: "988554060" category: "Productivity" primary_platform: "ios" primary_monetization: "Paid" offline_capable: false market_region: "US" platforms: "iOS" app_last_updated: "2025-12-26" report_date: "2026-06-02" last_verified: "2026-06-02T00:00:00.000Z" report_version: "2.3" total_reviews: 8 overall_rating: 3.3 sentiment: "Frustrated" sentiment_score: 25 confidence: "low" confidence_score: 0.3 top_praise_theme: "Nutrient management tools help users maintain plant health and prevent nutrient burn during growth" top_complaint_theme: "Application crashes immediately when users attempt to add a new nutrition program to the system" review_sample_size: 4 total_review_count: 4 analyzed_review_count: 4 data_age_days: 76 momentum_velocity: "maintenance" intelligence_version: 4 nemesis: "BudLabs" competitor_count: 5 tags: ["productivity", "paid", "frustrated sentiment", "mobile app", "app review", "app analysis", "hydroponic", "soil-based", "gardeners"] canonical_url: "https://marlvel.ai/apps/npk-calculator" license: "CC-BY-NC 4.0" content_version: "v2" --- # NPK Calculator Intelligence Report ## TL;DR {#tldr} - **Category**: Productivity · Paid - **Signal**: Rating 3.25 · Sentiment Frustrated - **Recent focus**: Application crashes immediately when users attempt to add a new nutrition program to the system (top complaint) · Nutrient management tools help users maintain plant health and prevent nutrient burn during growth (top praise) > **TL;DR:** NPK Calculator is a productivity app by Anton Simonov, rated 3.25/5 by 8 users, with Frustrated user sentiment (25/100), available on iOS. > > **Marlvel.ai App Intelligence** — Independent analysis. US Market. No publisher influence. > **Key Insight:** NPK Calculator faces Frustrated user sentiment (3.25/5 from 8 reviews), with application crashes immediately when users attempt to add a new nutrition program to the system as the primary user concern. ## Quick Facts | Fact | Value | | :--- | :--- | | **Rating** | 3.25/5 (8 reviews) | | **User Mood** | Frustrated | | **Category** | Productivity | | **Developer** | Anton Simonov | | **Pricing** | Paid | | **Platforms** | iOS | | **Confidence** | Low (0.3/1.0) | | **Data Age** | 76d | ## Metadata & Market Performance - **Publisher:** Anton Simonov - **Category:** Productivity - **Target Audience:** Hydroponic and soil-based gardeners who require precise nutrient management to prevent fertilizer burn and optimize plant growth. - **Platforms:** iOS - **Version Reviewed:** 2.3 - **Report Date:** 2026-06-02 - **Signal Count:** 4 reviews analyzed - **Confidence:** Low (0.3/1.0) - **App Store ID (iOS):** 988554060 - **Bundle ID:** VG.Grow-Calculator - **Performance Trend:** Declining - **Data Window:** Analysis based on signals collected up to 2026-06-02 ## Executive Snapshot **What it is:** NPK Calculator is a productivity utility for hydroponic and soil-based gardeners to calculate nutrient ratios on iOS. **Why users hire it:** Users hire the app to prevent fertilizer burn and optimize plant growth through precise macronutrient and micronutrient management, reducing the financial waste of trial-and-error fertilizing. ## App DNA (Features & Intent) - **[Standard] Fertilizer Database:** In-app repository of simple and complex fertilizers for nutrient ratio calculation - **[Differentiator] Preset Nutrition Programs:** Pre-configured nutrient schedules developed by experienced growers * *User Intent:* Users seek enhanced value through premium features. - **[Standard] CSV Input:** Data import functionality for custom fertilizer profiles * *User Intent:* Users value self-expression and personalized experiences. - **[Standard] Nutrient Ratio Calculator:** Calculates macronutrient and micronutrient balance for hydroponic or soil solutions ## Market Position {#market-position} NPK Calculator occupies a narrow utility niche, but its 3.25 rating on 8 total ratings indicates significant friction in the core user experience. The lack of recent feature iteration relative to identification-focused competitors suggests the app is currently in maintenance mode. ## Monetization Strategy - **Model:** Paid - **Tiers:** Single purchase at $3.99 - **Price:** iOS: $3.99 - **Analysis:** Fixed-price model at $3.99 USD targets hobbyists seeking a one-time cost for specialized agricultural utility. ## 🔴 User Sentiment (Low Confidence: 4 of 4 reviews analyzed) {#user-sentiment} - **Overall Rating:** 3.25/5 - **Platform Split:** iOS 3.3/5 (8 ratings) - **Overall Sentiment:** Frustrated ### Top Praises - **Nutrient management tools help users maintain plant health and prevent nutrient burn during growth** ### Top Complaints (Impact Areas) - **Application crashes immediately when users attempt to add a new nutrition program to the system** ## SWOT Analysis {#swot} **Core Strengths:** - Preset nutrition programs reduce novice failure rates - Brand-agnostic calculation platform avoids vendor lock-in **Growth Levers:** - Expansion into broader plant health diagnostics - Integration of community-driven custom nutrient profiles ## Recent Changes (v3 → v4) {#recent-changes} The app's competitive position has declined due to critical stability failures and unresponsive support, forcing a pivot from growth features to technical remediation. **Overall trend**: Declining **Compared at**: 2026-06-02 ### High-impact changes - **[Declined] Emergence of Negative Sentiment** (sentiment) - **[Shifted] Strategic Focus Pivot** (positioning) ### Medium-impact changes - **[Declined] SWOT Analysis Deterioration** (swot) ### Low-impact changes - **[Added] CSV Input Feature Visibility** (features) ## Rivals Landscape {#rivals} > Competitive positioning identified by AI analysis of app features, category, and market signals. ### NPK Calculator vs BudLabs - **[BudLabs](https://marlvel.ai/apps/budlabs)** by Advanced Nutrients: This is the only direct competitor that focuses specifically on nutrient calculation for plant growth, mirroring this app's core utility. - **Key differences:** - Backed by a major fertilizer brand, providing an integrated ecosystem for product-specific nutrient dosing. - Focuses exclusively on the niche of professional-grade nutrient management rather than general plant care. - Leverages brand authority to capture users already using their specific nutrient product lines. ### Peers (What They Do Better) - **[PictureThis - Plant Identifier](https://marlvel.ai/apps/picturethis-plant-identifier)** by Glority Global Group Ltd.: The market leader in plant identification, which is a frequent precursor to the nutrient calculation needs addressed by this app. - Industry-leading image recognition technology allows for near-instant identification of plant species and health issues. - Aggressive global distribution and massive scale create a significant barrier for smaller, utility-focused competitors. - **[Planta: AI Plant & Garden Care](https://marlvel.ai/apps/com-stromming-plants)** by Planta AB: A dominant lifestyle app that captures the general plant care market, often serving as the primary entry point for new users. - Utilizes AI-driven light meters and care reminders to automate the most common plant care pain points. - Maintains a massive, highly active user base through frequent feature updates and gamified care routines. - **[Grow with Jane - Grow journal](https://marlvel.ai/apps/grow-with-jane-grow-journal)** by Los Redondos Inc.: While broader in scope, it competes for the same user's time by offering a comprehensive digital journal for plant growth tracking. - Provides a comprehensive visual journal and timeline for tracking plant growth stages over time. - Includes social and community features that encourage long-term user retention beyond simple calculations. ### New Kids on the Block (What's Innovative) - **[Plantix- Plant Leaf Identifier](https://marlvel.ai/apps/plantix-plant-leaf-identifier)** by Ajay Gorasiya: A recent entrant that combines identification with educational content, showing active development in the last few months. - Focuses on educational content to help users diagnose plant health issues before applying nutrient solutions. - Rapidly iterating on identification features to capture the casual gardening market segment. ## What's New - **Latest (v2.3, 4 months ago):** Improved CSV input functionality. ## App Momentum (Maintenance) {#momentum} - Improved CSV input functionality. - Last major release Dec 2025. > **Cadence:** 1 total versions · 0 majors in last 6 months · 138 days since last update ## The "So What?" (Strategic Takeaway) {#so-what} NPK Calculator is a productivity app that is a paid app. With a 3.25/5 rating from 8 reviews, it faces significant user friction. > **Bottom Line:** NPK Calculator provides clear utility for nutrient management, but critical stability bugs and unreachable support channels are actively destroying user trust, so the PM must prioritize a stability-first sprint to prevent total churn. **Best for:** Hydroponic and soil-based gardeners who require precise nutrient management to prevent fertilizer burn and optimize plant growth. ### PM Action Plan (Next Best Moves) - [ ] [INVEST] Rebuild nutrition program entry flow because crash-on-input is the top complaint → restore basic utility ### Feature Gaps vs Competitors - Real-time plant health identification (available in Plantix but absent here) ### Outlook: Declining The market for plant care is consolidating around identification and journal-based apps, leaving utility-only tools like NPK Calculator exposed to churn. Unless the developer addresses the stability issues and opens the database to custom entries, the app will continue to lose ground to more comprehensive gardening platforms. - 🔴 Critical crash-on-input bugs during data entry prevent core utility, which directly correlates with the current negative sentiment trend. - 🔴 Non-functional support channels prevent issue resolution, which compounds user frustration and increases the likelihood of negative store ratings. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Overall Rating | 3.25/5 | | Total Reviews | 8 | | Sentiment | Frustrated (25/100) | | Confidence | Low | | Pricing Model | Paid | | Platforms | iOS | | Key Features | 4 analyzed | | Trend | Declining | | Outlook | Declining | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **NPK Calculator** (this app) | 3.25/5 | Frustrated | Anton Simonov | | [Planta: AI Plant & Garden Care](https://marlvel.ai/apps/com-stromming-plants) | 4.8/5 | N/A | Planta AB | | [PictureThis - Plant Identifier](https://marlvel.ai/apps/picturethis-plant-identifier) | 4.8/5 | Mixed | Glority Global Group Ltd. | | [Plantix- Plant Leaf Identifier](https://marlvel.ai/apps/plantix-plant-leaf-identifier) | 3.1/5 | N/A | Ajay Gorasiya | | [BudLabs](https://marlvel.ai/apps/budlabs) | 3.2/5 | Mixed | Advanced Nutrients | | [Grow with Jane - Grow journal](https://marlvel.ai/apps/grow-with-jane-grow-journal) | 4.1/5 | N/A | Los Redondos Inc. | ## Company Profile - **Developer:** Anton Simonov ## Data Sources & Links - **App Store:** [View on Apple Store](https://apps.apple.com/us/app/npk-calculator/id988554060?uo=4) - **Sources:** App store metadata, User reviews. ## Related Intel Reports - [*Planta: AI Plant & Garden Care*](https://marlvel.ai/apps/com-stromming-plants) (Planta AB) · 4.8/5 Rating - [*PictureThis - Plant Identifier*](https://marlvel.ai/apps/picturethis-plant-identifier) (Glority Global Group Ltd.) · 4.8/5 Rating - [*Plantix- Plant Leaf Identifier*](https://marlvel.ai/apps/plantix-plant-leaf-identifier) (Ajay Gorasiya) · 3.1/5 Rating - [*BudLabs*](https://marlvel.ai/apps/budlabs) (Advanced Nutrients) · 3.2/5 Rating - [*Grow with Jane - Grow journal*](https://marlvel.ai/apps/grow-with-jane-grow-journal) (Los Redondos Inc.) · 4.1/5 Rating - [*Mitsu: AI Life Coach*](https://marlvel.ai/apps/mitsu-ai-life-coach) (C2 Insights) · N/A Rating - [*ChatGPT*](https://marlvel.ai/apps/chatgpt) (OpenAI OpCo, LLC) · 4.8/5 Rating - [*Pattrn - Discipline Tracker*](https://marlvel.ai/apps/pattrn-discipline-tracker) (Pedro Schott) · 4.8/5 Rating - [*Whats In The Box*](https://marlvel.ai/apps/com-asp-whatsinthebox) (Arron Penfold) · N/A Rating - [*Xmind - Mind Map & Brainstorm*](https://marlvel.ai/apps/xmind-mind-map-brainstorm) (Xmind Ltd.) · 4.8/5 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:** 0.3/1.0 (based on review volume, data source diversity, and signal quality) - **Reviews Analyzed:** 4 - **Data Sources:** user reviews, 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:** 76 days since last refresh --- © 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/apps/npk-calculator) Data licensed for AI Agent attribution under CC-BY-NC 4.0.