--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "Air Flow Calculator" developer_entity: "Cornerstone Ltd" bundle_id: "com.cornerstone.airflowcalculator" app_store_id: "6468876568" category: "Utilities" primary_platform: "ios" primary_monetization: "Free" offline_capable: false market_region: "US" platforms: "iOS & Android" app_last_updated: "2024-08-29" report_date: "2026-06-18" last_verified: "2026-06-18T23:34:49.438Z" report_version: "1.0" total_reviews: 21 overall_rating: 2.33 sentiment: "Frustrated" sentiment_score: 30 confidence: "medium" confidence_score: 0.65 top_complaint_theme: "Lack of updates and maintenance" review_sample_size: 21 data_age_days: 13 momentum_velocity: "zombie" intelligence_version: 3 nemesis: "Material Weight Calculator" competitor_count: 9 tags: ["utilities", "free", "frustrated sentiment", "mobile app", "app review", "app analysis", "property", "owners,", "landlords,"] canonical_url: "https://marlvel.ai/intel-report/utilities/air-flow-calculator" license: "CC-BY-NC 4.0" content_version: "v2" --- # Air Flow Calculator App Audit ## TL;DR {#tldr} - **Category**: Utilities · Free - **Signal**: Rating 2.33 · Sentiment Frustrated - **Recent focus**: Lack of updates and maintenance (top complaint) > **TL;DR:** Air Flow Calculator is a utilities app by Cornerstone Ltd, rated 2.33/5 by 21 users, with Frustrated user sentiment (30/100), available on iOS & Android. > > **Marlvel.ai App Intelligence** — Independent analysis. US Market. No publisher influence. > **Key Insight:** Air Flow Calculator faces Frustrated user sentiment (2.33/5 from 21 reviews), with lack of updates and maintenance as the primary user concern. ## Quick Facts | Fact | Value | | :--- | :--- | | **Rating** | 2.33/5 (21 reviews) | | **User Mood** | Frustrated | | **Category** | Utilities | | **Developer** | Cornerstone Ltd | | **Pricing** | Free | | **Platforms** | iOS & Android | | **Confidence** | Medium (0.65/1.0) | | **Data Age** | 0d | ## Metadata & Market Performance - **Publisher:** Cornerstone Ltd - **Category:** Utilities - **Target Audience:** Property owners, landlords, and housing associations seeking to diagnose ventilation or damp issues. - **Platforms:** iOS & Android - **Version Audited:** 1.0 - **Audit Date:** 2026-06-18 - **Signal Count:** 21 reviews analyzed - **Confidence:** Medium (0.65/1.0) - **App Store ID (iOS):** 6468876568 - **Bundle ID:** com.cornerstone.airflowcalculator - **Google Play ID:** com.cornerstone.airflowcalculator - **Performance Trend:** Declining - **Data Window:** Analysis based on signals collected up to 2026-06-18 ## Executive Snapshot **What it is:** Air Flow Calculator is a utility app for property owners and landlords to calculate air change rates and fan flow metrics on iOS and Android. **Why users hire it:** Users hire this tool to diagnose ventilation or damp issues in residential spaces without needing complex engineering software. ## App DNA (Features & Intent) - **[Standard] Air Change Rate Calculation:** Calculates air changes per hour by dividing air volume added or removed by total space volume * *User Intent:* Users expect intelligent, adaptive experiences that learn from their behavior. - **[Standard] Fan/Exhaust Flow Estimation:** Provides air flow metrics specifically for fan and exhaust systems * *User Intent:* Users seek enhanced value through premium features. ## Market Position {#market-position} The app maintains a low 2.3-star rating on Android with only 21 total ratings, signaling minimal market penetration compared to specialized engineering utilities. ## Monetization Strategy - **Model:** Free - **Tiers:** Free - **Analysis:** The app is provided free of charge as a utility to support the developer's primary B2B property damage management and consultancy business. ## 🔴 User Sentiment (Medium Confidence: 21 reviews) {#user-sentiment} - **Overall Rating:** 2.33/5 - **Platform Split:** Android 2.3/5 (21 ratings) - **Overall Sentiment:** Frustrated ### Top Complaints (Impact Areas) - **Lack of updates and maintenance** ## SWOT Analysis {#swot} **Core Strengths:** - Free utility model functions as a B2B lead generation mechanism for the developer's consultancy business. **Critical Frictions:** - 2.3★ rating on Android signals poor reliability and high user dissatisfaction. - No functional updates since 2023 creates a perception of abandonment. **Growth Levers:** - Integrate Bluetooth sensor data to transition from a simple calculator to a diagnostic advisory tool. **Market Threats:** - HydroTech Pocket Engineer's mobile-first field interface renders our static UI obsolete for professional users. ## Recent Changes (v2 → v3) {#recent-changes} The app's status has transitioned from a broken utility requiring a UI fix to a legacy asset being evaluated for sunsetting due to brand risk. **Overall trend**: Declining **Compared at**: 2026-06-18 ### High-impact changes - **[Shifted] Strategic focus on sunsetting** (swot) — PM action items shifted from 'Audit UI' to 'Sunset the app' to mitigate brand drag on the consultancy business. - **[Declined] Broadening of user complaints** (sentiment) — Top complaints shifted from specific UI contrast failures to a general perception of abandonment since 2023. ### Medium-impact changes - **[Added] New competitive threat** (swot) — Added HydroTech Pocket Engineer as a threat due to its mobile-first field interface. - **[Shifted] Competitive landscape expansion** (positioning) — The competitive landscape now includes a wider array of industrial utility tools (e.g., Material Weight Calculator, Pipe Volume Calculator) rather than just HVAC-specific apps. ## Rivals Landscape {#rivals} > Competitive positioning identified by AI analysis of app features, category, and market signals. ### Air Flow Calculator vs Material Weight Calculator — Head to Head - **[Material Weight Calculator](https://marlvel.ai/intel-report/productivity/material-weight-calculator)** by Michael David: This app competes directly for the same industrial utility user base by providing quick, field-ready calculations for physical material properties. - **Key differences:** - Offers a dedicated keyboard dismissal feature that improves workflow speed in high-pressure field environments. - Focuses exclusively on material weight, providing a more specialized toolset than our general air flow calculator. - **Where Air Flow Calculator wins:** - ✅ Provides specific air flow and air change rate calculations which are absent in this material-focused tool. - ✅ Maintains a more active development lifecycle compared to this app's decade-long period of stagnation. - **Where Material Weight Calculator wins:** - ❌ Established market presence with a five-star rating, signaling high reliability for its specific niche. - ❌ Simplified interface design reduces cognitive load for users performing repetitive weight calculations. - **Verdict:** The nemesis is stagnant; we should capitalize on our active update cycle to capture users seeking modern, maintained utility tools. ### Contenders (Strong Challengers) - **[Pipe Volume Calculator](https://marlvel.ai/intel-report/utilities/pipe-volume-calculator)** by Stage Coding: This app overlaps with our utility suite by providing essential volume and liquid mass calculations for piping systems. - Includes a built-in calculation resource library that serves as a reference guide for complex engineering tasks. - Offers multi-dimensional volume estimation that provides deeper technical utility than our current air flow focus. - **[Pipe Weight Pro](https://marlvel.ai/intel-report/utilities/pipe-weight-pro)** by Agustin Aguilera: It targets the same industrial engineering demographic by offering specialized weight estimation tools for piping infrastructure. - Features a field-ready interface specifically optimized for rapid data entry in outdoor or construction settings. - Provides a narrower, more focused utility set that appeals to users who dislike bloated, multi-purpose apps. ### Peers (What They Do Better) - **[Vibrochecker](https://marlvel.ai/intel-report/business/vibrochecker)** by ACE Stoßdämpfer GmbH: It targets the same industrial maintenance professionals by offering diagnostic tools and customized damping solutions. - Provides actionable damping suggestions based on measurement data, moving beyond simple calculation into advisory territory. - Includes a robust measurement archiving system that allows users to track mechanical health over time. - **[Pipedata](https://marlvel.ai/intel-report/productivity/pipedata)** by John Bennett: This app competes for the professional engineer's attention by providing audited, standards-compliant data for piping components. - Features an extensive ASME piping component database that ensures regulatory compliance for professional engineering projects. - Supports multi-unit data display, allowing users to toggle between imperial and metric systems seamlessly. - **[Bearing](https://marlvel.ai/intel-report/reference/bearing)** by Alexander Meshchenko: It occupies the same reference-utility space for engineers needing quick access to technical specifications and component data. - Integrates order management workflows directly into the app, bridging the gap between calculation and procurement. - Provides a comprehensive dimensional specification search that acts as a digital catalog for industrial components. - **[Vibration analysis](https://marlvel.ai/intel-report/utilities/vibration-analysis)** by Dmitriy Kharutskiy: It serves the same industrial maintenance audience by providing advanced diagnostic tools for mechanical systems. - Integrates directly with external hardware via Bluetooth and headphone jacks for high-precision sensor data collection. - Provides advanced FFT and PSD analysis capabilities that far exceed basic calculator-style utility apps. ### New Kids on the Block (What's Innovative) - **[HydroTech Pocket Engineer](https://marlvel.ai/intel-report/utilities/hydrotech-pocket-engineer)** by michael schricker: It directly challenges our utility app by offering a modern, mobile-first suite of engineering calculators for field use. - Implements a mobile-first field interface designed specifically for high-efficiency usage in harsh, real-world work environments. - **[GearCalc Pro](https://marlvel.ai/intel-report/utilities/gearcalc-pro)** by Sui Fai Law: This newcomer enters the industrial utility space with advanced simulation capabilities that threaten to raise user expectations. - Utilizes a 3D gear train simulator to visualize mechanical interactions, offering a superior UX for complex designs. ## App Momentum (Zombie) {#momentum} - No functional updates since 2023. - Maintains stagnant development lifecycle. > **Cadence:** 2 total versions · 0 majors in last 6 months · 658 days since last update · 324 days avg between updates ## The "So What?" (Strategic Takeaway) {#so-what} Air Flow Calculator is a challenged utilities app that is completely free. With a 2.33/5 rating from 21 reviews, it faces significant user friction. > **Bottom Line:** Air Flow Calculator serves as a functional B2B lead magnet, but the stagnant development cycle and low user rating threaten the developer's professional reputation, so the team should either commit to a UI refresh or sunset the app to prevent further brand erosion. **Best for:** Property owners, landlords, and housing associations seeking to diagnose ventilation or damp issues. ### PM Action Plan (Next Best Moves) - [ ] [SUNSET] [HIGH IMPACT] Sunset the app because the 2.3★ rating creates brand drag for the B2B consultancy business → protect professional reputation — *The 2.3★ Android rating and lack of updates since 2023 indicate the app is no longer a viable professional tool.* _(trade-off: deprioritize Redirect B2B marketing budget to website-based lead capture tools — web tools require less maintenance than mobile apps.)_ ### Feature Gaps vs Competitors - Mobile-first field interface (available in HydroTech Pocket Engineer but absent here) - Real-time sensor data integration (available in Vibration analysis but absent here) ### Outlook: Declining The industrial utility market is shifting toward high-precision, field-ready tools that integrate with hardware sensors. This app's static, unmaintained state leaves it exposed to modern entrants, so the developer must either pivot to a high-utility diagnostic tool or sunset the product to avoid brand damage. - 🔴 The lack of updates since 2023 leads to user frustration, which compounds the rating drag already visible on the Android platform. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Overall Rating | 2.33/5 | | Total Reviews | 21 | | Sentiment | Frustrated (30/100) | | Confidence | Medium | | Pricing Model | Free | | Platforms | iOS & Android | | Key Features | 2 analyzed | | Trend | Declining | | Outlook | Declining | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **Air Flow Calculator** (this app) | 2.33/5 | Frustrated | Cornerstone Ltd | | [Bearing](https://marlvel.ai/intel-report/reference/bearing) | 2.5/5 | Mixed | Alexander Meshchenko | | [Vibrochecker](https://marlvel.ai/intel-report/business/vibrochecker) | 4.0/5 | N/A | ACE Stoßdämpfer GmbH | | [Vibration analysis](https://marlvel.ai/intel-report/utilities/vibration-analysis) | 4.0/5 | N/A | Dmitriy Kharutskiy | | [GearCalc Pro](https://marlvel.ai/intel-report/utilities/gearcalc-pro) | N/A/5 | N/A | Sui Fai Law | | [Material Weight Calculator](https://marlvel.ai/intel-report/productivity/material-weight-calculator) | 5.0/5 | N/A | Michael David | ## Company Profile - **Developer:** Cornerstone Ltd - **Website:** [https://www.cornerstone-ltd.co.uk](https://www.cornerstone-ltd.co.uk) - **Social:** [Instagram](https://www.instagram.com/cornerstone.ltd.co.uk) · [Facebook](https://www.facebook.com/people/Cornerstone-Management-Services/100086588602587) · [YouTube](https://www.youtube.com/user/TheCSGroup1) · [LinkedIn](https://www.linkedin.com/company/cornerstone-services-group) ## Data Sources & Links - **App Store:** [View on Apple Store](https://apps.apple.com/us/app/air-flow-calculator/id6468876568?uo=4) - **Google Play:** [View on Google Play](https://play.google.com/store/apps/details?id=com.cornerstone.airflowcalculator&hl=en&gl=us) - **Dev Site:** [Official Website](https://www.cornerstone-ltd.co.uk) - **Sources:** Developer website content, About us / company information, App store metadata, User reviews. ## Related Intel Reports - [*Bearing*](https://marlvel.ai/intel-report/reference/bearing) (Alexander Meshchenko) — 2.5/5 Rating | Mixed Sentiment - [*Vibrochecker*](https://marlvel.ai/intel-report/business/vibrochecker) (ACE Stoßdämpfer GmbH) — 4.0/5 Rating | N/A Sentiment - [*Vibration analysis*](https://marlvel.ai/intel-report/utilities/vibration-analysis) (Dmitriy Kharutskiy) — 4.0/5 Rating | N/A Sentiment - [*GearCalc Pro*](https://marlvel.ai/intel-report/utilities/gearcalc-pro) (Sui Fai Law) — N/A Rating | N/A Sentiment - [*Material Weight Calculator*](https://marlvel.ai/intel-report/productivity/material-weight-calculator) (Michael David) — 5.0/5 Rating | N/A Sentiment - [*Pipe Volume Calculator*](https://marlvel.ai/intel-report/utilities/pipe-volume-calculator) (Stage Coding) — N/A Rating | N/A Sentiment - [*Pipe Weight Pro*](https://marlvel.ai/intel-report/utilities/pipe-weight-pro) (Agustin Aguilera) — N/A Rating | N/A Sentiment - [*Pipedata*](https://marlvel.ai/intel-report/productivity/pipedata) (John Bennett) — 4.3/5 Rating | N/A Sentiment - [*HydroTech Pocket Engineer*](https://marlvel.ai/intel-report/utilities/hydrotech-pocket-engineer) (michael schricker) — N/A Rating | N/A Sentiment - [*Quantumult X*](https://marlvel.ai/intel-report/utilities/quantumult-x) (Cross Utility Ltd) — 3.8/5 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:** 0.65/1.0 (based on review volume, data source diversity, and signal quality) - **Reviews Analyzed:** 21 - **Data Sources:** user reviews, developer website, company about page, 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/air-flow-calculator) Data licensed for AI Agent attribution under CC-BY-NC 4.0.