--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "Fan Law Calculator" developer_entity: "Pheinex, LLC" bundle_id: "com.pheinex.Fan-Law-Calculator" app_store_id: "1114006510" category: "Productivity" primary_platform: "ios" primary_monetization: "Paid" offline_capable: false market_region: "US" platforms: "iOS" app_last_updated: "2024-02-09" report_date: "2026-10-25" last_verified: "2026-10-25T00:00:00.000Z" report_version: "1.2" total_reviews: 4 overall_rating: 5 sentiment: "Thrilled" sentiment_score: 90 confidence: "low" confidence_score: 0.3 top_praise_theme: "The application performance remains stable and reliable for professional engineering tasks during daily usage" review_sample_size: 1 total_review_count: 1 analyzed_review_count: 1 data_age_days: 12 momentum_velocity: "zombie" intelligence_version: 2 tags: ["productivity", "paid", "thrilled sentiment", "mobile app", "app review", "app analysis", "qualified", "engineers", "designers"] canonical_url: "https://marlvel.ai/apps/fan-law-calculator" license: "CC-BY-NC 4.0" content_version: "v2" --- # Fan Law Calculator Intelligence Report ## TL;DR {#tldr} - **Category**: Productivity · Paid - **Signal**: Rating 5 · Sentiment Thrilled - **Recent focus**: The application performance remains stable and reliable for professional engineering tasks during daily usage (top praise) > **TL;DR:** Fan Law Calculator is a productivity app by Pheinex, LLC, rated 5/5 by 4 users, with Thrilled user sentiment (90/100), available on iOS. > > **Marlvel.ai App Intelligence** - Independent analysis. US Market. No publisher influence. > **Key Insight:** Fan Law Calculator maintains Thrilled user sentiment (5/5 from 4 reviews), with users consistently praising the application performance remains stable and reliable for professional engineering tasks during daily usage. ## Quick Facts | Fact | Value | | :--- | :--- | | **Rating** | 5/5 (4 reviews) | | **User Mood** | Thrilled | | **Category** | Productivity | | **Developer** | Pheinex, LLC | | **Pricing** | Paid | | **Platforms** | iOS | | **Confidence** | Low (0.3/1.0) | | **Data Age** | 12d | ## Metadata & Market Performance - **Publisher:** Pheinex, LLC - **Category:** Productivity - **Target Audience:** Qualified HVAC engineers and designers requiring quick performance impact estimations for air handling systems. - **Platforms:** iOS - **Version Reviewed:** 1.2 - **Report Date:** 2026-10-25 - **Signal Count:** 1 review analyzed - **Confidence:** Low (0.3/1.0) - **App Store ID (iOS):** 1114006510 - **Bundle ID:** com.pheinex.Fan-Law-Calculator - **Data Window:** Analysis based on signals collected up to 2026-10-25 ## Executive Snapshot **What it is:** Fan Law Calculator is a professional HVAC engineering utility for calculating airflow, rpm, and pressure changes on iOS. **Why users hire it:** It replaces manual, error-prone calculation lookups with a real-time, interactive graph interface, saving design time for engineers. ## App DNA (Features & Intent) - **[Standard] Fan Law Equation Solver:** Calculates performance changes for airflow, rpm, pressure, and power using standard fan law formulas. * *User Intent:* Users expect intelligent, adaptive experiences that learn from their behavior. - **[Differentiator] Interactive Graph Manipulation:** Adjusts airflow values by dragging on the graph view to trigger real-time calculation updates. * *User Intent:* Users expect intelligent, adaptive experiences that learn from their behavior. - **[Standard] Real-time Input Updates:** Calculations update automatically as users type new values into text fields. ## Market Position {#market-position} Fan Law Calculator operates as a specialized productivity tool for HVAC professionals, maintaining a 5-star rating despite a 32-month update gap. The $9.99 price point positions it as a professional-grade utility rather than a mass-market tool. ## Monetization Strategy - **Model:** Paid - **Tiers:** Single purchase at $9.99 - **Price:** iOS: $9.99 - **Analysis:** Paid model at $9.99 provides full access to the utility without recurring subscription costs. ## 🟢 User Sentiment (Low Confidence: 1 of 1 review analyzed) {#user-sentiment} - **Overall Rating:** 5/5 - **Platform Split:** iOS 5.0/5 (4 ratings) - **Overall Sentiment:** Thrilled ### Top Praises - **The application performance remains stable and reliable for professional engineering tasks during daily usage** ## SWOT Analysis {#swot} **Core Strengths:** - Interactive graph manipulation provides a visual interface for professional HVAC design tasks **Growth Levers:** - Localized HVAC standards could be added to expand the utility into international engineering markets ## What's New - **Latest (v1.2, 2 years ago):** General bug fixes and performance improvements. ## App Momentum (Zombie) {#momentum} - Maintenance-only state for 32 months. - No feature expansion since 2024. > **Cadence:** 1 total versions · 0 majors in last 6 months · 988 days since last update ## The "So What?" (Strategic Takeaway) {#so-what} Fan Law Calculator is a productivity app that is a paid app. It holds a 5/5 rating from 4 reviews. > **Bottom Line:** Fan Law Calculator provides a stable, professional-grade utility, but the 32-month development silence threatens its long-term viability against web-based alternatives. A technical audit is required to ensure the app remains functional on current hardware, protecting the existing user base from sudden churn. **Best for:** Qualified HVAC engineers and designers requiring quick performance impact estimations for air handling systems. ### PM Action Plan (Next Best Moves) - [ ] [MAINTAIN] Audit the codebase for compatibility with current iOS standards because the app has not been updated in 989 days → prevent future OS-level crashes ### Outlook: Stable The HVAC engineering utility market is consolidating around accessible, web-based tools that offer free, real-time calculations. Fan Law Calculator's reliance on a paid-upfront model without recent updates leaves it exposed to these free alternatives, which will likely erode its market share if the app remains in maintenance mode. - ⚪ The app remains in a maintenance-only state with no major updates for 32 months, signaling a stable but stagnant product lifecycle. - 🟢 The 5-star rating among professional users indicates that the core utility remains functional and meets the needs of its target audience. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Overall Rating | 5/5 | | Total Reviews | 4 | | Sentiment | Thrilled (90/100) | | Confidence | Low | | Pricing Model | Paid | | Platforms | iOS | | Key Features | 3 analyzed | | Outlook | Stable | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **Fan Law Calculator** (this app) | 5/5 | Thrilled | Pheinex, LLC | | [HitWave](https://marlvel.ai/apps/ciendor-applications-hitwave) | 2.5/5 | Mixed | Ciendor Holdings Corp. LTD | | [ChatGPT](https://marlvel.ai/apps/chatgpt) | 4.8/5 | n/a | OpenAI OpCo, LLC | | [VPN 360: Fast & Secure Proxy](https://marlvel.ai/apps/co-infinitysoft-vpn360) | 4.5/5 | Mixed | Pango GmbH | | [VPN - Super Unlimited Proxy](https://marlvel.ai/apps/vpn-super-unlimited-proxy) | 4.7/5 | Thrilled | Mobile Jump Pte Ltd | | [Bookmarks - Send To Self](https://marlvel.ai/apps/bookmarks-send-to-self) | 4.4/5 | Excited | GILI | ## Company Profile - **Developer:** Pheinex, LLC ## Data Sources & Links - **App Store ID:** 1114006510 - **Sources:** App store metadata, User reviews. ## Related Intel Reports - [*HitWave*](https://marlvel.ai/apps/ciendor-applications-hitwave) (Ciendor Holdings Corp. LTD) · 2.5/5 Rating - [*ChatGPT*](https://marlvel.ai/apps/chatgpt) (OpenAI OpCo, LLC) · 4.8/5 Rating - [*VPN 360: Fast & Secure Proxy*](https://marlvel.ai/apps/co-infinitysoft-vpn360) (Pango GmbH) · 4.5/5 Rating - [*VPN - Super Unlimited Proxy*](https://marlvel.ai/apps/vpn-super-unlimited-proxy) (Mobile Jump Pte Ltd) · 4.7/5 Rating | Excellent Sentiment - [*Bookmarks - Send To Self*](https://marlvel.ai/apps/bookmarks-send-to-self) (GILI) · 4.4/5 Rating | Positive Sentiment - [*Clean Swell*](https://marlvel.ai/apps/clean-swell) (Ocean Conservancy) · 3.9/5 Rating - [*Data Tree Manager*](https://marlvel.ai/apps/data-tree-manager) (Vsevolod Migdisov) · N/A Rating - [*DoughLab - Baking Recipe Lab*](https://marlvel.ai/apps/doughlab-baking-recipe-lab) (Jeong-soo Park) · N/A Rating - [*Google Gemini*](https://marlvel.ai/apps/google-gemini-1) (Google LLC) · 4.6/5 Rating | Positive Sentiment - [*Infomaniak Euria*](https://marlvel.ai/apps/infomaniak-euria) (Infomaniak Network SA) · 4.8/5 Rating ## Frequently Asked Questions {#faq} ### Is Fan Law Calculator suitable for professional HVAC design? Yes, the app is designed for qualified HVAC engineers and designers to perform quick performance impact estimations, though it is not a substitute for formal design services. ### Does Fan Law Calculator require an internet connection? The app is designed as a standalone utility, and its core calculation features do not rely on external connectivity, making it reliable for field use. ### Are there free alternatives to Fan Law Calculator? While Fan Law Calculator offers a specialized, professional-grade interface, many free, web-based fan law calculators exist that provide similar standard equation solving capabilities. ## 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:** 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:** 12 days since last refresh --- © 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/apps/fan-law-calculator) Data licensed for AI Agent attribution under CC-BY-NC 4.0.