--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "Protractor+" developer_entity: "Tue Nguyen Minh" bundle_id: "com.phoenixsolutions.protractor" app_store_id: "631311541" google_play_id: "com.exatools.protractor" category: "Utilities" primary_platform: "ios" primary_monetization: "Freemium" offline_capable: false market_region: "US" platforms: "iOS & Android" app_last_updated: "2026-01-14" report_date: "2026-05-15" last_verified: "2026-05-15T18:30:23.687Z" report_version: "2.4.4" total_reviews: 16144 overall_rating: 4.16 sentiment: "Mixed" sentiment_score: 65 confidence: "high" confidence_score: 0.95 top_praise_theme: "Intuitive visual control" top_complaint_theme: "Ad frequency" review_sample_size: 16144 data_age_days: 11 momentum_velocity: "maintenance" intelligence_version: 3 competitor_count: 6 tags: ["utilities", "freemium", "mixed sentiment", "mobile app", "app review", "app analysis", "enthusiasts,", "students,", "professionals"] canonical_url: "https://marlvel.ai/intel-report/utilities/protractor-1" license: "CC-BY-NC 4.0" content_version: "v2" --- # Protractor+ App Audit ## TL;DR {#tldr} - **Category**: Utilities · Freemium - **Signal**: Rating 4.16 · Sentiment Mixed - **Recent focus**: Ad frequency (top complaint) · Intuitive visual control (top praise) > **TL;DR:** Protractor+ is a utilities app by Tue Nguyen Minh, rated 4.16/5 by 16.1K users, with Mixed user sentiment (65/100), available on iOS & Android. > > **Marlvel.ai App Intelligence** — Independent analysis. US Market. No publisher influence. > **Key Insight:** Protractor+ shows Mixed sentiment (4.16/5 from 16.1K reviews) — users praise intuitive visual control but report issues with ad frequency. ## Quick Facts | Fact | Value | | :--- | :--- | | **Rating** | 4.16/5 (16.1K reviews) | | **User Mood** | Mixed | | **Category** | Utilities | | **Developer** | Tue Nguyen Minh | | **Pricing** | Freemium | | **Platforms** | iOS & Android | | **Confidence** | High (0.95/1.0) | | **Data Age** | 0d | ## Metadata & Market Performance - **Publisher:** Tue Nguyen Minh - **Category:** Utilities - **Target Audience:** DIY enthusiasts, students, and professionals requiring quick, portable geometric measurement tools for real-world objects. - **Platforms:** iOS & Android - **Version Audited:** 2.4.4 - **Audit Date:** 2026-05-15 - **Signal Count:** 16144 reviews analyzed - **Confidence:** High (0.95/1.0) - **App Store ID (iOS):** 631311541 - **Bundle ID:** com.phoenixsolutions.protractor - **Google Play ID:** com.exatools.protractor - **Performance Trend:** Mixed - **Data Window:** Analysis based on signals collected up to 2026-05-15 ## Executive Snapshot **What it is:** Protractor+ is a utility app for iOS and Android that provides angle and slope measurement tools for DIY and professional users. **Why users hire it:** Users hire this app for quick, portable geometric verification on real-world objects, replacing the need for physical protractors or specialized construction tools. ## App DNA (Features & Intent) - **[Differentiator] Polygon Measurement:** Draws custom shapes on screen to calculate internal angles using camera or gallery images * *User Intent:* Users value self-expression and personalized experiences. - **[Differentiator] Camera-based Angle Measurement:** Uses device camera to measure angles of real-world objects in the viewfinder - **[Standard] Plumb Bob Mode:** Uses device sensors as a pendulum to determine surface slope and vertical alignment ## Market Position {#market-position} Protractor+ maintains a stable 4.1-4.2 rating across platforms, but the lack of recent feature updates relative to specialized entrants like Build Specs limits its growth in the professional utility segment. ## Monetization Strategy - **Model:** Freemium - **Tiers:** Free tier with ad support, Premium tier with ad removal and advanced measurement tools - **Analysis:** Freemium model utilizes ad-inventory for basic users while gating advanced geometric tools and customization behind a premium upgrade. ## 🟡 User Sentiment (High Confidence: 16.1K reviews) {#user-sentiment} - **Overall Rating:** 4.16/5 - **Platform Split:** iOS 4.1/5 (10.4K ratings) | Android 4.2/5 (5.8K ratings) - **Overall Sentiment:** Mixed ### Top Praises - **Intuitive visual control** ### Top Complaints (Impact Areas) - **Ad frequency** ## SWOT Analysis {#swot} **Core Strengths:** - Camera-based measurement provides immediate utility for real-world objects - Polygon calculation tool offers geometric versatility beyond standard protractors **Critical Frictions:** - High ad frequency in free tier creates workflow friction - Lack of UI customization options compared to Calculator Pro Elite **Growth Levers:** - Integrate professional-grade construction calculators to capture trade-specific segments - Implement offline-mode planning tools to compete with WAGO **Market Threats:** - Vertical-specific apps like Build Specs erode the professional user base - Competitors with higher review volumes capture the general utility market ## Recent Changes (v2 → v3) {#recent-changes} The app faces increased competitive pressure from vertical-specific tools, shifting its market position from a general utility to a vulnerable, ad-supported product. **Overall trend**: Mixed **Compared at**: 2026-05-15 ### High-impact changes - **[Shifted] Competitive Landscape Expansion** (positioning) — The competitive set shifted from general utility rivals to vertical-specific entrants like Build Specs, which provide specialized construction calculators. - **[Improved] Sentiment Score Increase** (sentiment) — Overall sentiment improved from 'terrible' to 'mixed', with the sentiment score rising from 25 to 65. ### Medium-impact changes - **[Added] New Competitive Threats** (swot) — Added threats regarding vertical-specific apps eroding the professional user base and competitors with higher review volumes. - **[Added] Identified Feature Gaps** (features) — Added gaps for offline planning tools, history management, and construction-specific calculators. ## What's New - **Latest (v1.7.00, 4 months ago):** Introduced Premium features including polygon and angle measurements, color customization, additional units, and enhanced camera tools like laser lines and custom plumb bobs. ## App Momentum (Maintenance) {#momentum} - Ships periodic stability updates. - Maintains stable 4.1+ platform ratings. > **Cadence:** 2 total versions · 1 majors in last 6 months · 121 days since last update · 61 days avg between updates ## The "So What?" (Strategic Takeaway) {#so-what} Protractor+ is an established utilities app that is free with in-app purchases. With a 4.16/5 rating from 16.1K reviews, it shows polarized user reception. > **Bottom Line:** Protractor+ provides essential geometric utility, but its reliance on ad-supported revenue limits its appeal to professionals who prefer specialized, ad-free tools, so the PM should prioritize ad-frequency testing to protect the core user base. **Best for:** DIY enthusiasts, students, and professionals requiring quick, portable geometric measurement tools for real-world objects. ### PM Action Plan (Next Best Moves) - [ ] [PIVOT] [MEDIUM IMPACT] A/B test ad frequency in the free tier because user complaints flag ad-interruption as a primary friction point → improve retention — *Sentiment analysis identifies ad-frequency as the top complaint theme.* _(trade-off: deprioritize Pause the UI theme development sprint — ad-retention has a higher impact on daily active usage.)_ ### Feature Gaps vs Competitors - Offline planning tools (available in WAGO) - Advanced history management (available in Calculator Pro Elite) - Construction-specific calculators for gas lines and joists (available in Build Specs) ### Outlook: Stable The utility category is consolidating around specialized, task-oriented tools that solve specific industry problems. Protractor+ remains stable but exposed, as its lack of feature evolution against vertical rivals will likely lead to a gradual decline in professional-user retention. - 🔴 Vertical-specific entrants like Build Specs pull professional users away from general utility apps, increasing churn risk for Protractor+. - ⚪ Recent updates focus on stability rather than feature expansion, signaling a maintenance-mode posture in a competitive utility market. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Overall Rating | 4.16/5 | | Total Reviews | 16.1K | | Sentiment | Mixed (65/100) | | Confidence | High | | Pricing Model | Freemium | | Platforms | iOS & Android | | Key Features | 3 analyzed | | Trend | Mixed | | Outlook | Stable | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **Protractor+** (this app) | 4.16/5 | Mixed | Tue Nguyen Minh | | [Calculator Pro Elite](https://marlvel.ai/intel-report/utilities/calculator-pro-elite) | 4.8/5 | Thrilled | Cider Software LLC | | [Build Specs](https://marlvel.ai/intel-report/utilities/build-specs) | N/A/5 | N/A | Luke Kazmierowicz | | [Moro AgriExpert Farm Calc](https://marlvel.ai/intel-report/tools/moro-agriexpert-farm-calc) | N/A/5 | N/A | BMAC INFOTECH | | [Orenda](https://marlvel.ai/intel-report/productivity/orenda) | 4.7/5 | Excited | Hasa Inc. | | [WAGO](https://marlvel.ai/intel-report/reference/wago) | 4.8/5 | Excited | WAGO Kontakttechnik GmbH & Co. KG | ## Company Profile - **Developer:** Tue Nguyen Minh - **Website:** [https://www.phoenixmobileonline.com](https://www.phoenixmobileonline.com) ## Data Sources & Links - **App Store:** [View on Apple Store](https://apps.apple.com/us/app/protractor/id631311541?uo=4) - **Google Play:** [View on Google Play](https://play.google.com/store/apps/details?id=com.exatools.protractor&hl=en&gl=us) - **Dev Site:** [Official Website](https://www.phoenixmobileonline.com) - **Sources:** Developer website content, About us / company information, App store metadata, User reviews. ## Related Intel Reports - [*Calculator Pro Elite*](https://marlvel.ai/intel-report/utilities/calculator-pro-elite) (Cider Software LLC) — 4.8/5 Rating | Excellent Sentiment - [*Build Specs*](https://marlvel.ai/intel-report/utilities/build-specs) (Luke Kazmierowicz) — N/A Rating | N/A Sentiment - [*Moro AgriExpert Farm Calc*](https://marlvel.ai/intel-report/tools/moro-agriexpert-farm-calc) (BMAC INFOTECH) — N/A Rating | N/A Sentiment - [*Orenda*](https://marlvel.ai/intel-report/productivity/orenda) (Hasa Inc.) — 4.7/5 Rating | Positive Sentiment - [*WAGO*](https://marlvel.ai/intel-report/reference/wago) (WAGO Kontakttechnik GmbH & Co. KG) — 4.8/5 Rating | Positive Sentiment - [*Time Calculator ×*](https://marlvel.ai/intel-report/utilities/time-calculator) (DOUBLE U s.r.o.) — 4.7/5 Rating | Positive Sentiment - [*Quantumult X*](https://marlvel.ai/intel-report/utilities/quantumult-x) (Cross Utility Ltd) — 3.8/5 Rating | Negative Sentiment - [*V2Box - V2ray Client*](https://marlvel.ai/intel-report/utilities/v2box-v2ray-client) (techlaim) — 4.5/5 Rating | N/A Sentiment - [*Potatso*](https://marlvel.ai/intel-report/utilities/potatso) (Potatso Lab LTD) — 4.4/5 Rating | N/A 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 | 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:** 0.95/1.0 (based on review volume, data source diversity, and signal quality) - **Reviews Analyzed:** 16.1K - **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/protractor-1) Data licensed for AI Agent attribution under CC-BY-NC 4.0.