Report updated Jun 23, 2026
Protractor+
For dIY enthusiasts, students, and construction professionals requiring portable, camera-integrated angle measurement tools.
Protractor+ is a challenged utilities app that is free with in-app purchases. With a 4.2/5 rating from 16.1K reviews, it faces significant user friction. Users particularly appreciate visual camera overlay tools provide accurate measurements for quick home improvement tasks, though aggressive monetization tactics restrict core functionality behind paywalls immediately after installation remains a common concern.
What is Protractor+?
Protractor+ is a utility app for iOS and Android that turns the camera into an angle measurement tool for DIY and construction tasks.
Users hire this app for quick, portable geometry checks on physical objects, but the current monetization design forces a trade-off between utility and ad-interruption that drives users to seek alternatives.
Current Momentum
v1.7 · 4mo ago
Maintenance- Shipped polygon measurement tool
- Introduced laser and auxiliary line overlays
- Expanded angle unit support
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 Mood
What makes this app unique?
What Does It Look Like?
Loading...
What Are The Key Features?
Draw custom shapes on screen or camera preview to calculate internal angles
Overlay angle measurement tools onto real-time camera feed for physical object analysis
Pendulum-based tool to determine surface slope and vertical alignment
How much does it cost?
- Free tier with ad support
- Premium tier via IAP for ad removal and advanced measurement tools
Monetization relies on an ad-supported free tier with a feature-gated premium upgrade for professional measurement modes.
Who Built It?
Enrichment in progress
Publisher profile available very soon
What other apps does Tue Nguyen Minh make?
Clinometer+
Utilities
HTML Editor®
Para desarrolladores
Unit Converter - Pro Units App
Referencia
Toolbox™
Utilidades
What do users think recently?
Low confidence · Latest 69 of 99 total reviews analyzed · Based on 99 reviews. Signal may be noisy.
How did the latest release land?
What is the recent mood?
Recent user voice shows a frustrated sentiment. Users appreciate visual camera overlay tools provide accurate measurements for quick home improvement tasks, but report aggressive monetization tactics restrict core functionality behind paywalls immediately after installation and excessive advertisement frequency disrupts the user experience during basic measurement tasks.
What Users Love
What Frustrates Users
What Users Want
View the full user-sentiment analysis
Mood gauge, ratings & review-volume history, every praise / complaint / request, and sentiment over time.
What is the competitive landscape for Protractor+?
Where is it available?
Localized markets (1)
How's The Utilities Market?
Market outlook for this category
Available very soon
Which niche is Protractor+ in?
to measure angles using a mobile device
Explore the full Geometry Calculators niche
Every app in this space — 1 tracked, the niche's live rankings, and Marlvel's editorial take on the job-to-be-done.
The rivals identified
Same space(7)
As a professional-tier version of a direct competitor, it targets users requiring data documentation alongside standard angle measurement.
Differentiators
- Includes data documentation features that allow users to save and export their measurement results
- Focuses on professional workflows by combining image analysis with structured record-keeping capabilities
This app is a direct functional competitor that utilizes camera-based image analysis to measure angles in real-time.
Differentiators
- Offers real-time camera integration for immediate visual feedback on physical objects in the environment
- Utilizes dual measurement modes to provide flexibility between standard degree and radian calculations
This app targets the same precision-oriented demographic by offering advanced camera-based measurement and optical calculation tools.
Differentiators
- Provides a comprehensive database of camera formats that exceeds standard protractor measurement capabilities
- Maintains a high release cadence with five updates in six months, signaling active product development
Orenda competes for the utility-focused user base by providing specialized calculation tools that solve complex professional measurement problems.
Differentiators
- Integrates proprietary industry-specific educational content and academy resources directly into the user workflow
- Leverages a strong B2B rewards program to drive long-term user retention and brand loyalty
This app targets the same general-purpose utility audience as Protractor+ by providing a more robust, feature-rich calculation environment.
It occupies the same 'niche utility' space, focusing on specific measurement conversions that simplify daily tasks for the user.
WAGO competes by providing professional-grade reference and planning tools that overlap with the utility-focused user base.
New entrants(1)
This newcomer targets the niche agricultural utility market, providing complex dosage and calibration calculations for farm management.
Differentiators
- Provides highly specialized agricultural calibration tools for sprayers and NPK fertilizer dosage calculations
Compare Protractor+ against every rival
All rivals in one side-by-side table — identity, store metrics, ratings & sentiment, and strategic intel — plus a head-to-head page for each.
The outtake for Protractor+
Strengths to defend, gaps to attack
Core Strengths
- Camera-based measurement mechanism enables immediate real-world utility
- Plumb Bob mode provides specialized retention for construction tasks
Critical Frictions
- 0.13 rating gap between iOS and Android
- Aggressive paywall gating triggers high-churn sentiment
- Excessive ad frequency disrupts basic measurement workflows
Growth Levers
- Import-from-photo functionality for free users
- B2B partnerships with hardware retailers for tool distribution
Market Threats
- pCAM Pro's five-update cadence in six months
- MKS Beton's industry-specific material calculators
- Rising user expectation for free-tier utility
What are the next best moves?
Pivot monetization to a 3-day trial because paywall gating triggers high-churn sentiment → increase long-term retention
User sentiment analysis identifies immediate paywall gating as the #1 complaint.
Trade-off: Pause the visual customization feature sprint — monetization friction is the higher revenue risk.
Audit camera-session performance because post-update lag is a top technical complaint → stabilize rating baseline
Reports of lag during camera usage correlate with negative sentiment in the latest release.
Trade-off: Deprioritize the new plumb bob UI skin — technical stability is required to stop the rating slide.
A counter-intuitive read
The app's biggest risk is not the competitor feature set, but the immediate monetization gating which converts potential power users into churned detractors before they experience the core value.
Feature Gaps vs Competitors
- Data documentation and export (available in Angle Meter PRO but absent here)
- Industry-specific material calculation (available in MKS Beton but absent here)
Key Takeaways
Protractor+ delivers high-utility camera measurement, but aggressive monetization kills the user experience, so the PM must pivot to a trial-based model to stop the churn and stabilize the rating.
Where Is It Heading?
Declining
The utility market is consolidating around apps that provide frictionless access to core tools, leaving Protractor+ exposed due to its aggressive monetization. Unless the team shifts to a trial-based model and resolves performance regressions, the app will continue to lose ground to competitors with higher release cadences.
Aggressive paywall gating immediately after installation drives high churn, which compounds the negative sentiment visible in recent user reviews.
Performance regressions in the latest update (lag and orientation issues) erode the core camera-measurement utility, further depressing the Android rating.