Report updated May 15, 2026
Protractor+
For dIY enthusiasts, students, and professionals requiring quick, portable geometric measurement tools for real-world objects.
Protractor+ is an established utilities app that is free with in-app purchases. With a 4.2/5 rating from 16.1K reviews, it shows polarized user reception. Users particularly appreciate intuitive visual control, though ad frequency remains a common concern.
What is Protractor+?
Protractor+ is a utility app for iOS and Android that provides angle and slope measurement tools for DIY and professional users.
Users hire this app for quick, portable geometric verification on real-world objects, replacing the need for physical protractors or specialized construction tools.
Current Momentum
v1.7 · 4mo ago
Maintenance- Ships periodic stability updates.
- Maintains stable 4.1+ platform ratings.
Active Nemesis
Fragmented niche
No dominant direct rival identified yet — see Other Rivals below.
Other Rivals
7-Day Rank Pulse 🇺🇸
UtilitiesNo ranking data
Rating Pulse 🇺🇸
Recent User MoodAI-powered deep analysis surfacing high-signal insights. Still in beta, accuracy improves daily. For informational purposes only.
What makes this app unique?
What Does It Look Like?
How Is The App's Momentum Right Now?
Loading...
What Are The Key Features?
Draws custom shapes on screen to calculate internal angles using camera or gallery images
Uses device camera to measure angles of real-world objects in the viewfinder
Uses device sensors as a pendulum to determine surface slope and vertical alignment
How much does it cost?
- Free tier with ad support
- Premium tier with ad removal and advanced measurement tools
Freemium model utilizes ad-inventory for basic users while gating advanced geometric tools and customization behind a premium upgrade.
Who Built It?
Enrichment in progress
Publisher profile available very soon
What other apps does Tue Nguyen Minh make?
HTML Editor®
Para desarrolladores
Unit Converter - Pro Units App
Referencia
Toolbox™
Utilidades
Ruler®
Utilities
What do users think recently?
High confidence · Latest 100 of 16.1K total reviews analyzed
How did the latest release land?
What is the recent mood?
Recent user voice shows a mixed sentiment. Users appreciate intuitive visual control, but report ad frequency.
What Users Love
What Frustrates Users
What is the competitive landscape for Protractor+?
How's The Utilities Market?
Market outlook for this category
Available very soon
The rivals identified
Peers
Features offline planning tools that allow users to work without a consistent internet connection
Includes a proprietary 'SnapandSearch' feature for rapid identification of technical components
Specializes in time-based arithmetic which serves a distinct, high-frequency use case for professionals
Utilizes preset time keys to drastically reduce input friction compared to standard manual entry
Offers advanced history management with multiple tapes for complex multi-step calculation tracking
Provides deep UI customization options including themes that Protractor+ currently lacks
Integrates proprietary educational content and academy resources directly into the core calculation workflow
Leverages a B2B rewards program to drive long-term user retention and brand loyalty
New Kids on the Block
Offers niche agricultural dosing calculators for fertilizers and pesticides, targeting a specific industry vertical
Build Specs
0Luke Kazmierowicz
This newcomer targets the construction and trade professional segment with highly specific, task-oriented calculators.
Provides specialized construction calculators for gas lines, stairs, and joists that Protractor+ lacks
The outtake for Protractor+
Strengths to defend, gaps to attack
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
What are the next best moves?
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: Pause the UI theme development sprint — ad-retention has a higher impact on daily active usage.
A counter-intuitive read
The app's reliance on ads is not just a monetization choice but a structural barrier that prevents it from competing with professional-grade tools that prioritize workflow speed.
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)
Key Takeaways
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.
Where Is It Heading?
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.