--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "Rectangular Beam" developer_entity: "Rab Elias" bundle_id: "com.Karina.RectangularBeam" app_store_id: "1436344246" category: "Productivity" primary_platform: "ios" primary_monetization: "Paid" offline_capable: false market_region: "US" platforms: "iOS" app_last_updated: "2024-08-09" report_date: "2026-08-20" last_verified: "2026-08-20T00:00:00.000Z" report_version: "8.2" total_reviews: 2 overall_rating: 1 sentiment: "Upset" sentiment_score: 10 confidence: "low" confidence_score: 0.3 top_complaint_theme: "Complex design workflows require too many steps to complete simple tasks within the application interface" review_sample_size: 2 total_review_count: 2 analyzed_review_count: 2 data_age_days: 19 momentum_velocity: "zombie" intelligence_version: 3 tags: ["productivity", "paid", "upset sentiment", "mobile app", "app review", "app analysis", "civil", "structural", "engineers"] canonical_url: "https://marlvel.ai/apps/rectangular-beam" license: "CC-BY-NC 4.0" content_version: "v2" --- # Rectangular Beam Intelligence Report ## TL;DR {#tldr} - **Category**: Productivity · Paid - **Signal**: Rating 1 · Sentiment Upset - **Recent focus**: Complex design workflows require too many steps to complete simple tasks within the application interface (top complaint) > **TL;DR:** Rectangular Beam is a productivity app by Rab Elias, rated 1/5 by 2 users, with Upset user sentiment (10/100), available on iOS. > > **Marlvel.ai App Intelligence** - Independent analysis. US Market. No publisher influence. > **Key Insight:** Rectangular Beam faces Upset user sentiment (1/5 from 2 reviews), with users reporting complex design workflows require too many steps to complete simple tasks within the application interface as the primary concern. ## Quick Facts | Fact | Value | | :--- | :--- | | **Rating** | 1/5 (2 reviews) | | **User Mood** | Upset | | **Category** | Productivity | | **Developer** | Rab Elias | | **Pricing** | Paid | | **Platforms** | iOS | | **Confidence** | Low (0.3/1.0) | | **Data Age** | 19d | ## Metadata & Market Performance - **Publisher:** Rab Elias - **Category:** Productivity - **Target Audience:** Civil and structural engineers requiring mobile tools for reinforced concrete beam design and analysis. - **Platforms:** iOS - **Version Reviewed:** 8.2 - **Report Date:** 2026-08-20 - **Signal Count:** 2 reviews analyzed - **Confidence:** Low (0.3/1.0) - **App Store ID (iOS):** 1436344246 - **Bundle ID:** com.Karina.RectangularBeam - **Performance Trend:** Declining - **Data Window:** Analysis based on signals collected up to 2026-08-20 ## Executive Snapshot **What it is:** Rectangular Beam is a structural engineering tool for reinforced concrete beam design, providing reinforcement and deflection calculations on iOS. **Why users hire it:** The tool removes the friction of desktop-based structural analysis for engineers in the field, though current launch failures prevent it from serving this need effectively. ## App DNA (Features & Intent) - **[Standard] Reinforcement Calculation:** Calculates required reinforcement for tension and compression zones. - **[Differentiator] Strain Distribution Diagram:** Plots strain distribution and provides epsilon values for each rebar layer. * *User Intent:* Users seek enhanced value through premium features. - **[Differentiator] Deflection and Crack Analysis:** Computes crack width and beam deflection based on applied moments and forces. ## Market Position {#market-position} Rectangular Beam occupies a narrow productivity niche with a $4.99 price point. The 1-star rating across 2 reviews indicates the product fails to meet the basic usability expectations of its professional audience. ## Monetization Strategy - **Model:** Paid - **Tiers:** Single purchase at $4.99 - **Price:** iOS: $4.99 - **Analysis:** Paid model at $4.99 per download, targeting professional engineers with specific structural design utility. ## 🔴 User Sentiment (Low Confidence: 2 of 2 reviews analyzed) {#user-sentiment} - **Overall Rating:** 1/5 - **Platform Split:** iOS 1.0/5 (2 ratings) - **Overall Sentiment:** Upset ### Top Complaints (Impact Areas) - **Complex design workflows require too many steps to complete simple tasks within the application interface** ## SWOT Analysis {#swot} **Core Strengths:** - Specialized structural analysis algorithms for strain distribution **Growth Levers:** - UI refresh to capture engineers seeking portable tools ## Recent Changes (v2 → v3) {#recent-changes} The product's status has shifted from a maintenance-focused recovery plan to a formal recommendation for sunsetting, driven by the persistent 24-month development gap and critical launch failures. **Overall trend**: Declining **Compared at**: 2026-08-20 ### High-impact changes - **[Shifted] Sunset Recommendation** (positioning) ### Medium-impact changes - **[Shifted] Refined SWOT Focus** (swot) ## What's New - **Latest (v8.2, 2 years ago):** Added Combined Foundation to the Useful iOS application list. ## App Momentum (Zombie) {#momentum} - No updates for 24 months - Maintenance-mode status confirmed > **Cadence:** 1 total versions · 1 majors in last 6 months · 740 days since last update ## The "So What?" (Strategic Takeaway) {#so-what} Rectangular Beam is a productivity app that is a paid app. It holds a 1/5 rating from 2 reviews. > **Bottom Line:** Rectangular Beam provides niche engineering utility, but the current launch failures and 24-month maintenance gap render it unusable for professionals [1, 2]. Sunset posture is appropriate until a resource-light maintenance cycle can restore basic functionality. **Best for:** Civil and structural engineers requiring mobile tools for reinforced concrete beam design and analysis. ### PM Action Plan (Next Best Moves) - [ ] [MAINTAIN] Audit launch sequence because the latest update prevents app startup → restore basic functionality ### Outlook: Declining The mobile structural engineering market is consolidating around tools with active update cadences that ensure compliance with current building codes. Rectangular Beam's maintenance-mode status and launch failures leave it exposed to abandonment by its professional user base, which will likely lead to total churn by Q4. - 🔴 The 24-month update gap (last release August 2024) signals a lack of active maintenance, which erodes professional trust in the tool's accuracy. - 🔴 Critical launch failures in the latest version prevent usage, which compounds the negative sentiment already present in the user base. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Overall Rating | 1/5 | | Total Reviews | 2 | | Sentiment | Upset (10/100) | | Confidence | Low | | Pricing Model | Paid | | Platforms | iOS | | Key Features | 3 analyzed | | Trend | Declining | | Outlook | Declining | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **Rectangular Beam** (this app) | 1/5 | Upset | Rab Elias | | [Mitsu: AI Life Coach](https://marlvel.ai/apps/mitsu-ai-life-coach) | N/A/5 | N/A | C2 Insights | | [ChatGPT](https://marlvel.ai/apps/chatgpt) | 4.8/5 | n/a | OpenAI OpCo, LLC | | [HitWave](https://marlvel.ai/apps/ciendor-applications-hitwave) | 2.6/5 | Mixed | Ciendor Holdings Corp. LTD | | [Paper: Sketch, Draw & Create](https://marlvel.ai/apps/paper-sketch-draw-create) | 4.6/5 | N/A | Evernote Corporation | | [Pattrn - Discipline Tracker](https://marlvel.ai/apps/pattrn-discipline-tracker) | 4.8/5 | Thrilled | Pedro Schott | ## Company Profile - **Developer:** Rab Elias ## Data Sources & Links - **App Store:** [View on Apple Store](https://apps.apple.com/us/app/rectangular-beam/id1436344246?uo=4) - **Sources:** App store metadata, User reviews. ## Related Intel Reports - [*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 - [*HitWave*](https://marlvel.ai/apps/ciendor-applications-hitwave) (Ciendor Holdings Corp. LTD) · 2.6/5 Rating - [*Paper: Sketch, Draw & Create*](https://marlvel.ai/apps/paper-sketch-draw-create) (Evernote Corporation) · 4.6/5 Rating - [*Pattrn - Discipline Tracker*](https://marlvel.ai/apps/pattrn-discipline-tracker) (Pedro Schott) · 4.8/5 Rating | Excellent Sentiment - [*SpaceDesk App*](https://marlvel.ai/apps/spacedesk-app) (Hawsabah) · N/A Rating - [*한음달-한국인에게 꼭 맞는 음력달력, 캘린더*](https://marlvel.ai/apps/app--103) (YunaSoft Inc.) · 4.6/5 Rating - [*바로메모 - 매일 바로 작성하는 메모장*](https://marlvel.ai/apps/cswpd-memo) (SuWon Choi) · N/A Rating - [*근로장려금 알리미 - 신청, 기준, 금액계산 가이드*](https://marlvel.ai/apps/com-swing2app-v3-d83e9bb95c05347f59ad81dea3b925ebf) (SY Company) · 3.8/5 Rating - [*통화관리솔루션 (부평구청용)*](https://marlvel.ai/apps/byto-bupyeong) (BYTO) · N/A Rating ## Frequently Asked Questions {#faq} ### Is Rectangular Beam suitable for professional structural design? While the app offers specific structural analysis, the current launch failures and 24-month update gap make it unreliable for professional use. ### Does Rectangular Beam work on the latest iOS versions? Users report that the application fails to function or launch entirely following the latest update. ### Are there alternatives to Rectangular Beam for concrete design? Engineers should look for structural analysis tools that maintain a regular update cadence to ensure compatibility with current mobile operating systems. ## 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:** 2 - **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:** 19 days since last refresh --- © 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/apps/rectangular-beam) Data licensed for AI Agent attribution under CC-BY-NC 4.0.