--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "NPKalc - Fertilizer Calculator" developer_entity: "Barton Cone" bundle_id: "com.bartcone.npkalc" app_store_id: "6497334549" google_play_id: "io.fcalc.starter" category: "Utilities" primary_platform: "ios" primary_monetization: "Free" offline_capable: false market_region: "US" platforms: "iOS & Android" app_last_updated: "2024-05-14" report_date: "2026-05-13" last_verified: "2026-05-13T00:59:48.973Z" report_version: "1.0" total_reviews: 15 overall_rating: 4.53 confidence: "low" confidence_score: 0.2 data_age_days: 4 momentum_velocity: "zombie" intelligence_version: 3 competitor_count: 4 tags: ["utilities", "free", "mobile app", "app review", "app analysis", "enthusiasts,", "gardeners,", "landscape"] canonical_url: "https://marlvel.ai/intel-report/utilities/npkalc-fertilizer-calculator" license: "CC-BY-NC 4.0" content_version: "v2" --- # NPKalc - Fertilizer Calculator App Audit ## TL;DR {#tldr} - **Category**: Utilities · Free - **Signal**: Rating 4.53 > **TL;DR:** NPKalc - Fertilizer Calculator is a utilities app by Barton Cone, rated 4.53/5 by 15 users, available on iOS & Android. > > **Marlvel.ai App Intelligence** — Independent analysis. US Market. No publisher influence. > **Key Insight:** NPKalc - Fertilizer Calculator is a utilities app by Barton Cone. ## Quick Facts | Fact | Value | | :--- | :--- | | **Rating** | 4.53/5 (15 reviews) | | **Category** | Utilities | | **Developer** | Barton Cone | | **Pricing** | Free | | **Platforms** | iOS & Android | | **Confidence** | Low (0.2/1.0) | | **Data Age** | 0d | ## Metadata & Market Performance - **Publisher:** Barton Cone - **Category:** Utilities - **Target Audience:** DIY lawn enthusiasts, gardeners, landscape professionals, golf course superintendents, and farmers requiring precise fertilizer application rates. - **Platforms:** iOS & Android - **Version Audited:** 1.0 - **Audit Date:** 2026-05-13 - **Signal Count:** 1 reviews analyzed - **Confidence:** Low (0.2/1.0) - **App Store ID (iOS):** 6497334549 - **Bundle ID:** com.bartcone.npkalc - **Google Play ID:** io.fcalc.starter - **Performance Trend:** Stable - **Data Window:** Analysis based on signals collected up to 2026-05-13 ## Executive Snapshot **What it is:** NPKalc is a fertilizer calculation utility for iOS and Android designed for gardeners, farmers, and landscape professionals. **Why users hire it:** Users hire this app to solve complex chemical ratio arithmetic, replacing manual conversion tables with a digital input interface. ## App DNA (Features & Intent) - **[Standard] Fertilizer Calculation Engine:** Calculates required fertilizer amounts based on user-provided input for granular and liquid types * *User Intent:* Users seek enhanced value through premium features. - **[Standard] Multi-Unit Measurement Support:** Allows input of fertilizer quantities using various units of measure - **[Differentiator] Professional-Grade Utility:** Provides specific calculation tools tailored for landscape professionals, golf course superintendents, and farmers * *User Intent:* Users seek enhanced value through premium features. ## Market Position {#market-position} NPKalc maintains a 4.53 rating on iOS with 15 reviews, positioning it as a niche utility tool. The lack of Android updates since 2021 suggests a primary focus on the Apple ecosystem. ## Monetization Strategy - **Model:** Free - **Tiers:** Free access to all calculation features - **Analysis:** The app is currently distributed as a free utility with no observable monetization gates or subscription tiers. ## SWOT Analysis {#swot} **Core Strengths:** - Professional-grade calculation logic tailored for specific agricultural segments **Critical Frictions:** - Zero Android updates since 2021 - No recurring engagement features to drive retention **Growth Levers:** - Integration with smart irrigation hardware to capture the broader DIY garden management market **Market Threats:** - Rapid adoption of AI-driven plant health tools that automate manual arithmetic ## Recent Changes (v2 → v3) {#recent-changes} The analysis shifted from a tactical focus on fixing a broken launch flow to a strategic assessment of the app's long-term retention and relevance in an AI-automated market. **Overall trend**: Stable **Compared at**: 2026-05-13 ### High-impact changes - **[Shifted] Strategic focus pivot** (positioning) — The narrative moved from prioritizing immediate stability patches for launch failures to addressing the lack of recurring engagement loops. - **[Shifted] Threat profile evolution** (swot) — Threats shifted from high-frequency update cycles of rivals to the risk of AI-driven tools automating the manual arithmetic the app provides. ### Medium-impact changes - **[Shifted] Competitive landscape update** (positioning) — The competitive set was replaced, removing GrowIt and Calculator+ in favor of niche-specific tools like Fish Tank Buddy and hardware-integrated platforms like RainPoint-TY. - **[Removed] Complaint resolution** (sentiment) — The critical launch-flow regression complaint was removed from the sentiment analysis, reflecting a shift in focus toward feature gaps. ## What's New - **Latest (v0.0.4, 4 years ago):** Fixed text wrapping and label display issues in UI components. ## App Momentum (Zombie) {#momentum} - No major feature updates since 2021. - Static utility model limits user retention. > **Cadence:** 2 total versions · 0 majors in last 6 months · 728 days since last update · 976 days avg between updates ## The "So What?" (Strategic Takeaway) {#so-what} NPKalc - Fertilizer Calculator is an established utilities app that is completely free. With a 4.53/5 rating from 15 reviews, it shows polarized user reception. > **Bottom Line:** NPKalc provides precise utility for agricultural professionals but lacks the recurring engagement loops necessary for long-term retention, so the PM should prioritize adding maintenance reminders to compete with broader garden management tools. **Best for:** DIY lawn enthusiasts, gardeners, landscape professionals, golf course superintendents, and farmers requiring precise fertilizer application rates. ### PM Action Plan (Next Best Moves) - [ ] [INVEST] [HIGH IMPACT] Ship maintenance reminders because the current static calculator lacks a retention loop → increase daily active usage. — *Competitor Fish Tank Buddy uses maintenance reminders to drive recurring engagement, a feature NPKalc currently lacks.* _(trade-off: deprioritize Deprioritize the UI redesign for the calculator engine — the current engine is functional and stable.)_ ### Feature Gaps vs Competitors - Maintenance reminders (available in Fish Tank Buddy but missing here) - Measurement converter (available in Fish Tank Buddy but missing here) - Remote appliance control (available in RainPoint-TY but missing here) ### Outlook: Stable The agricultural utility market is shifting toward integrated smart-home ecosystems that combine calculation with hardware control. NPKalc remains a static tool, which will likely lead to a gradual decline in relevance as users migrate to platforms that offer automated growth metrics. - 🔴 The lack of Android updates since 2021 indicates a maintenance-mode posture that leaves the app vulnerable to competitors with active release cadences. - ⚪ The current free-only model provides no revenue to fund future development, limiting the ability to build the retention features required for market growth. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Overall Rating | 4.53/5 | | Total Reviews | 15 | | Confidence | Low | | Pricing Model | Free | | Platforms | iOS & Android | | Key Features | 3 analyzed | | Trend | Stable | | Outlook | Stable | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **NPKalc - Fertilizer Calculator** (this app) | 4.53/5 | N/A | Barton Cone | | [Mango Exposure: The Calculator](https://marlvel.ai/intel-report/photo-video/mango-exposure-the-calculator) | 5.0/5 | N/A | Mango Umbrella LLC | | [Fish Tank Buddy](https://marlvel.ai/intel-report/utilities/fish-tank-buddy) | 5.0/5 | N/A | harry bloch | | [Fluidd](https://marlvel.ai/intel-report/utilities/fluidd) | 1.0/5 | Upset | Fluidd | | [RainPoint-TY](https://marlvel.ai/intel-report/utilities/rainpoint-ty) | 4.6/5 | N/A | Fujian Baldr Technology Co.,Ltd. | | [Quantumult X](https://marlvel.ai/intel-report/utilities/quantumult-x) | 3.8/5 | Frustrated | Cross Utility Ltd | ## Company Profile - **Developer:** Barton Cone ## Data Sources & Links - **App Store:** [View on Apple Store](https://apps.apple.com/us/app/npkalc-fertilizer-calculator/id6497334549?uo=4) - **Google Play:** [View on Google Play](https://play.google.com/store/apps/details?id=io.fcalc.starter&hl=en&gl=us) - **Sources:** App store metadata, User reviews. ## Related Intel Reports - [*Mango Exposure: The Calculator*](https://marlvel.ai/intel-report/photo-video/mango-exposure-the-calculator) (Mango Umbrella LLC) — 5.0/5 Rating | N/A Sentiment - [*Fish Tank Buddy*](https://marlvel.ai/intel-report/utilities/fish-tank-buddy) (harry bloch) — 5.0/5 Rating | N/A Sentiment - [*Fluidd*](https://marlvel.ai/intel-report/utilities/fluidd) (Fluidd) — 1.0/5 Rating | Terrible Sentiment - [*RainPoint-TY*](https://marlvel.ai/intel-report/utilities/rainpoint-ty) (Fujian Baldr Technology Co.,Ltd.) — 4.6/5 Rating | N/A Sentiment - [*Quantumult X*](https://marlvel.ai/intel-report/utilities/quantumult-x) (Cross Utility Ltd) — 3.8/5 Rating | Negative Sentiment - [*Free VPN by Free VPN .org™*](https://marlvel.ai/intel-report/utilities/free-vpn-by-free-vpn-org) (Free VPN LLC) — 4.3/5 Rating | Mixed Sentiment - [*Potatso*](https://marlvel.ai/intel-report/utilities/potatso) (Potatso Lab LTD) — 4.4/5 Rating | Positive Sentiment - [*V2Box - V2ray Client*](https://marlvel.ai/intel-report/utilities/v2box-v2ray-client) (techlaim) — 4.5/5 Rating | N/A Sentiment - [*Avoiding Happy Belated*](https://marlvel.ai/intel-report/utilities/avoiding-happy-belated) (Shriansh Shrivastava) — N/A Rating | N/A Sentiment - [*Nitefall: Browser dark mode*](https://marlvel.ai/intel-report/utilities/nitefall-browser-dark-mode) (FoxfortMobile) — 3.6/5 Rating | N/A 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:** 0.2/1.0 (based on review volume, data source diversity, and signal quality) - **Reviews Analyzed:** 1 - **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:** 0 days since last refresh --- © 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/intel-report/utilities/npkalc-fertilizer-calculator) Data licensed for AI Agent attribution under CC-BY-NC 4.0.