--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "GTP API Gravity Calculator2" developer_entity: "Gammon Technical Products" bundle_id: "com-GammonTech-Gammon-API-Gravity-Calc--com.GammonTech.Gammon-API-Gravity-Calc-" app_store_id: "6742924006" google_play_id: "com.google.android.calculator" category: "Utilities" primary_platform: "ios" primary_monetization: "Paid" offline_capable: false market_region: "US" platforms: "iOS & Android" app_last_updated: "2026-03-23" report_date: "2026-05-06" report_version: "1.3" total_reviews: 764791 overall_rating: 4.35 sentiment: "Mixed" sentiment_score: 55 confidence: "high" confidence_score: 0.75 top_praise_theme: "Simple and accurate calculation logic provides reliable utility for everyday math tasks" top_complaint_theme: "Recent design changes removed essential quick-answer displays and altered the decimal placement" top_request_theme: "Integration of financial conversion tools like currency and unit converters into the calculator" review_sample_size: 50 total_review_count: 50 analyzed_review_count: 50 data_age_days: 56 momentum_velocity: "maintenance" intelligence_version: 3 competitor_count: 4 tags: ["utilities", "paid", "mixed sentiment", "mobile app", "app review", "app analysis", "aviation", "industrial", "professionals"] canonical_url: "https://marlvel.ai/intel-report/utilities/gtp-api-gravity-calculator2" license: "CC-BY-NC 4.0" content_version: "v2" last_verified: "2026-05-06T19:07:16.680Z" --- # GTP API Gravity Calculator2 App Audit ## TL;DR {#tldr} - **Category**: Utilities · Paid - **Signal**: Rating 4.35 · Sentiment Mixed - **Recent focus**: Recent design changes removed essential quick-answer displays and altered the decimal placement (top complaint) · Simple and accurate calculation logic provides reliable utility for everyday math tasks (top praise) · Integration of financial conversion tools like currency and unit converters into the calculator (top request) > **TL;DR:** GTP API Gravity Calculator2 is a utilities app by Gammon Technical Products, rated 4.35/5 by 764.8K users, with Mixed user sentiment (55/100), available on iOS & Android. > > **Marlvel.ai App Intelligence** — Independent analysis. US Market. No publisher influence. > **Key Insight:** GTP API Gravity Calculator2 shows Mixed sentiment (4.35/5 from 764.8K reviews) — users praise simple and accurate calculation logic provides reliable utility for everyday math tasks but report issues with recent design changes removed essential quick-answer displays and altered the decimal placement. ## Quick Facts | Fact | Value | | :--- | :--- | | **Rating** | 4.35/5 (764.8K reviews) | | **User Mood** | Mixed | | **Category** | Utilities | | **Developer** | Gammon Technical Products | | **Pricing** | Paid | | **Platforms** | iOS & Android | | **Confidence** | High (0.75/1.0) | | **Data Age** | 0d | ## Metadata & Market Performance - **Publisher:** Gammon Technical Products - **Category:** Utilities - **Target Audience:** Aviation and industrial fuel professionals requiring precise fuel density and weight calculations. - **Platforms:** iOS & Android - **Version Audited:** 1.3 - **Audit Date:** 2026-05-06 - **Signal Count:** 50 reviews analyzed - **Confidence:** High (0.75/1.0) - **App Store ID (iOS):** 6742924006 - **Bundle ID:** com-GammonTech-Gammon-API-Gravity-Calc--com.GammonTech.Gammon-API-Gravity-Calc- - **Google Play ID:** com.google.android.calculator - **Performance Trend:** Declining - **Data Window:** Analysis based on signals collected up to 2026-05-06 - **Short Description:** A simple calculator utility for Android ## Executive Snapshot **What it is:** GTP API Gravity Calculator is a specialized fuel density and weight utility for aviation and industrial professionals on iOS and Android. **Why users hire it:** Users hire this tool to perform precise, industry-standard fuel gravity corrections that general-purpose calculators cannot reliably execute. ## App DNA (Features & Intent) - **[Differentiator] API Gravity Correction:** Calculates corrected API gravity at 60 degrees Fahrenheit for jet, gasoline, and diesel fuels. - **[Differentiator] Fuel Weight Calculation:** Determines total fuel weight based on API gravity inputs. ## Market Position {#market-position} The app serves a niche industrial utility segment, maintaining a 4.35 rating on Android despite recent UI regressions. The $9.99 iOS price point creates a significant conversion barrier compared to the free Android utility. ## Monetization Strategy - **Model:** Paid - **Tiers:** iOS: $9.99, Android: Free - **Price:** iOS: $9.99 - **Analysis:** Monetization is platform-specific, utilizing a $9.99 upfront purchase on iOS while maintaining the Android version as a free utility. ## 🟡 User Sentiment (High Confidence: 50 of 50 reviews analyzed) {#user-sentiment} - **Overall Rating:** 4.35/5 - **Platform Split:** Android 4.4/5 (764.8K ratings) - **Overall Sentiment:** Mixed ### Top Praises - **Simple and accurate calculation logic provides reliable utility for everyday math tasks** ### Top Complaints (Impact Areas) - **Recent design changes removed essential quick-answer displays and altered the decimal placement** ### Top Requests (What Users Want) - **Integration of financial conversion tools like currency and unit converters into the calculator** ## SWOT Analysis {#swot} **Core Strengths:** - Specialized fuel-density algorithms function as a B2B distribution barrier into aviation logistics partnerships. **Critical Frictions:** - $9.99 iOS price point sits above the $0-4.99 utility median, creating conversion friction. **Growth Levers:** - Integration of unit conversion tools would capture the broader industrial logistics market. **Market Threats:** - Technical instability post-update causes force-closures, driving users toward more stable, high-velocity competitors. ## Recent Changes (v2 → v3) {#recent-changes} The app shifted to a paid model on iOS and introduced UI regressions that have negatively impacted user sentiment and professional utility. **Overall trend**: Declining **Compared at**: 2026-05-06 ### High-impact changes - **[Shifted] Introduction of Paid iOS Tier** (pricing) — Pricing model changed from free to a $9.99 upfront purchase on iOS, while Android remains free. - **[Declined] Emergence of UI Regression Complaints** (sentiment) — New user complaints surfaced regarding the removal of real-time sum displays and decimal point repositioning. ### Medium-impact changes - **[Improved] Repositioning of Core Features** (features) — API Gravity Correction and Fuel Weight Calculation moved from 'standard' to 'differentiator' competitive status. - **[Shifted] Audience Narrowing** (audience) — Target audience definition shifted from broad 'industry professionals' to specific 'aviation and industrial fuel professionals'. ## What's New - **Latest (v9.1 (886477075), 1 months ago):** Updated UI to Material 3 Expressive design. ## App Momentum (Maintenance) {#momentum} - Implemented Material 3 Expressive design. - Added Dark Mode compatibility. > **Cadence:** 2 total versions · 1 majors in last 6 months · 44 days since last update · 276 days avg between updates ## The "So What?" (Strategic Takeaway) {#so-what} GTP API Gravity Calculator2 is an established utilities app that is a paid app. With a 4.35/5 rating from 764.8K reviews, it shows polarized user reception. > **Bottom Line:** The app provides essential industrial utility, but recent UI regressions and calculation errors threaten its professional reputation, so the PM must prioritize stability and accuracy to prevent user migration to more reliable competitors. **Best for:** Aviation and industrial fuel professionals requiring precise fuel density and weight calculations. ### PM Action Plan (Next Best Moves) - [ ] [PIVOT] [HIGH IMPACT] Restore quick-answer display because users flag its removal as a top usability regression → reduce churn. — *Sentiment data identifies the removal of real-time sum displays as the #1 complaint theme.* _(trade-off: deprioritize Pause the ongoing Material 3 UI polish — quick-answer restoration is a functional necessity.)_ - [ ] [INVEST] [HIGH IMPACT] Audit trigonometric calculation logic because users report inaccuracies post-update → restore professional trust. — *Reports of mathematical inaccuracies directly threaten the app's core value proposition for industrial users.* _(trade-off: deprioritize Delay the unit converter feature request — core accuracy is the primary retention lever.)_ ### Feature Gaps vs Competitors - Real-time currency conversion (available in general utility suites but absent here) - Memory recall functions (available in legacy versions but missing here) ### Outlook: Declining The utility market is consolidating around high-velocity, stable apps that prioritize OS compatibility and UI reliability. The subject app is currently exposed due to technical regressions, so the PM must stabilize the core calculation engine to prevent further loss of the professional user base. - 🔴 Technical instability and UI regressions in the latest update drive negative sentiment, which compounds the risk of professional user churn. - 🔴 The removal of legacy memory functions reduces efficiency for power users, leading to requests for parity features that remain unaddressed. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Overall Rating | 4.35/5 | | Total Reviews | 764.8K | | Sentiment | Mixed (55/100) | | Confidence | High | | Pricing Model | Paid | | Platforms | iOS & Android | | Key Features | 2 analyzed | | Trend | Declining | | Outlook | Declining | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **GTP API Gravity Calculator2** (this app) | 4.35/5 | Mixed | Gammon Technical Products | | [Calculator₊](https://marlvel.ai/intel-report/utilities/com-itwcalculator-calculatorforipadfree) | 4.7/5 | Mixed | Impala Studios | | [AI Cleaner: Clean Up Storage](https://marlvel.ai/intel-report/utilities/ai-cleaner-app) | 4.6/5 | N/A | GRIMLAX TRADE, S.L. | | [Speedtest by Ookla](https://marlvel.ai/intel-report/utilities/com-ookla-speedtest) | 4.5/5 | Mixed | Ookla | | [Google Authenticator](https://marlvel.ai/intel-report/utilities/google-authenticator) | 4.9/5 | Mixed | Google | | [Quantumult X](https://marlvel.ai/intel-report/utilities/quantumult-x) | 3.9/5 | Frustrated | Cross Utility Ltd | ## Company Profile - **Developer:** Gammon Technical Products - **Website:** [https://www.google.com/](https://www.google.com/) ## Data Sources & Links - **App Store:** [View on Apple Store](https://apps.apple.com/us/app/gtp-api-gravity-calculator2/id6742924006?uo=4) - **Google Play:** [View on Google Play](https://play.google.com/store/apps/details?id=com.google.android.calculator&hl=en&gl=us) - **Dev Site:** [Official Website](https://www.google.com/) - **Sources:** Developer website content, About us / company information, App store metadata, User reviews. ## Related Intel Reports - [*Calculator₊*](https://marlvel.ai/intel-report/utilities/com-itwcalculator-calculatorforipadfree) (Impala Studios) — 4.7/5 Rating | Mixed Sentiment - [*AI Cleaner: Clean Up Storage*](https://marlvel.ai/intel-report/utilities/ai-cleaner-app) (GRIMLAX TRADE, S.L.) — 4.6/5 Rating | N/A Sentiment - [*Speedtest by Ookla*](https://marlvel.ai/intel-report/utilities/com-ookla-speedtest) (Ookla) — 4.5/5 Rating | Mixed Sentiment - [*Google Authenticator*](https://marlvel.ai/intel-report/utilities/google-authenticator) (Google) — 4.9/5 Rating | Mixed Sentiment - [*Quantumult X*](https://marlvel.ai/intel-report/utilities/quantumult-x) (Cross Utility Ltd) — 3.9/5 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 | Negative Sentiment - [*V2Box - V2ray Client*](https://marlvel.ai/intel-report/utilities/v2box-v2ray-client) (techlaim) — 4.5/5 Rating | Mixed Sentiment - [*Calculator# Hide Photos Videos*](https://marlvel.ai/intel-report/utilities/calculator-hide-photos-videos) (NewSoftwares.net) — 4.4/5 Rating | N/A Sentiment - [*Rizz AI Chat Coach: Grizzly AI*](https://marlvel.ai/intel-report/utilities/grizzly-ai-gen-z-message-coach) (Tetiana Oliinyk) — 4.7/5 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:** 0.75/1.0 (based on review volume, data source diversity, and signal quality) - **Reviews Analyzed:** 50 - **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/gtp-api-gravity-calculator2) Data licensed for AI Agent attribution under CC-BY-NC 4.0.