--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "EMF Detector (Scanner)" developer_entity: "JongMin Lee" bundle_id: "daniel25.soft.EMF-Detector" app_store_id: "6759452241" category: "Utilities" primary_platform: "ios" primary_monetization: "Freemium" offline_capable: false market_region: "US" platforms: "iOS" app_last_updated: "2026-03-03" report_date: "2026-10-01" last_verified: "2026-10-01T00:00:00.000Z" report_version: "1.0.1" total_reviews: 1 overall_rating: 1 sentiment: "Upset" sentiment_score: 10 confidence: "medium" confidence_score: 0.45 top_complaint_theme: "Sensor calibration fails to maintain accuracy when the device angle changes during magnetic field measurements" review_sample_size: 1 total_review_count: 1 analyzed_review_count: 1 data_age_days: 36 momentum_velocity: "zombie" intelligence_version: 2 tags: ["utilities", "freemium", "upset sentiment", "mobile app", "app review", "app analysis", "users", "interested", "monitoring"] canonical_url: "https://marlvel.ai/apps/emf-detector-scanner" license: "CC-BY-NC 4.0" content_version: "v2" --- # EMF Detector (Scanner) Intelligence Report ## TL;DR {#tldr} - **Category**: Utilities · Freemium - **Signal**: Rating 1 · Sentiment Upset - **Recent focus**: Sensor calibration fails to maintain accuracy when the device angle changes during magnetic field measurements (top complaint) > **TL;DR:** EMF Detector (Scanner) is a utilities app by JongMin Lee, rated 1/5 by 1 users, with Upset user sentiment (10/100), available on iOS. > > **Marlvel.ai App Intelligence** - Independent analysis. US Market. No publisher influence. > **Key Insight:** EMF Detector (Scanner) faces Upset user sentiment (1/5 from 1 review), with users reporting sensor calibration fails to maintain accuracy when the device angle changes during magnetic field measurements as the primary concern. ## Quick Facts | Fact | Value | | :--- | :--- | | **Rating** | 1/5 (1 review) | | **User Mood** | Upset | | **Category** | Utilities | | **Developer** | JongMin Lee | | **Pricing** | Freemium | | **Platforms** | iOS | | **Confidence** | Medium (0.45/1.0) | | **Data Age** | 36d | ## Metadata & Market Performance - **Publisher:** JongMin Lee - **Category:** Utilities - **Target Audience:** Users interested in monitoring household electronics or exploring environmental magnetic activity for informational purposes. - **Platforms:** iOS - **Version Reviewed:** 1.0.1 - **Report Date:** 2026-10-01 - **Signal Count:** 1 review analyzed - **Confidence:** Medium (0.45/1.0) - **App Store ID (iOS):** 6759452241 - **Bundle ID:** daniel25.soft.EMF-Detector - **Data Window:** Analysis based on signals collected up to 2026-10-01 ## Executive Snapshot **What it is:** EMF Detector (Scanner) is a utility app for iPhone that visualizes electromagnetic field activity using the device's built-in magnetometer. **Why users hire it:** Users open EMF Detector (Scanner) to inspect household electronics or track magnetic changes, but the current sensor drift forces them to seek more reliable diagnostic tools. ## App DNA (Features & Intent) - **[Standard] Real-time EMF Meter:** Visualizes electromagnetic field activity using the device magnetometer with responsive updates. - **[Differentiator] FFT Frequency Analysis:** Inspects specific frequency components of detected signal changes, gated behind premium-tier upgrades. * *User Intent:* Users want to accelerate progress or gain temporary advantages. - **[Standard] Measurement History:** Logs previous EMF readings for review and comparison to encourage repeat usage. ## Market Position {#market-position} EMF Detector (Scanner) occupies a niche utility space, currently holding a 1★ rating from a limited review sample. The lack of updates since March 2026 signals a maintenance-mode posture that leaves it vulnerable to more active competitors. ## Monetization Strategy - **Model:** Freemium - **Tiers:** Free tier with basic monitoring, Upgrade options for advanced features - **Analysis:** Freemium model utilizing feature-gating to upsell advanced diagnostic and export tools. ## 🔴 User Sentiment (Medium Confidence: 1 of 1 review analyzed) {#user-sentiment} - **Overall Rating:** 1/5 - **Platform Split:** iOS 1.0/5 (1 ratings) - **Overall Sentiment:** Upset ### Top Complaints (Impact Areas) - **Sensor calibration fails to maintain accuracy when the device angle changes during magnetic field measurements** ## SWOT Analysis {#swot} **Core Strengths:** - Real-time waveform and graph views provide immediate visual feedback **Growth Levers:** - Integrating auto-calibration routines could resolve the primary user complaint ## What's New - **Latest (v1.0.1, 7 months ago):** Expanded language support to increase accessibility for international users. ## App Momentum (Zombie) {#momentum} - Quiet 7 months, bug fixes only - Last major release March 2026 > **Cadence:** 1 total versions · 0 majors in last 6 months · 211 days since last update ## The "So What?" (Strategic Takeaway) {#so-what} EMF Detector (Scanner) is an utilities app that is free with in-app purchases. It holds a 1/5 rating from 1 review. > **Bottom Line:** Fixing the sensor calibration logic is the only path to stabilizing the user base, as the current inconsistency makes the core utility unreliable. If the developer cannot resolve the hardware-sensor drift, the app will continue to lose ground to more stable, actively maintained alternatives. **Best for:** Users interested in monitoring household electronics or exploring environmental magnetic activity for informational purposes. ### PM Action Plan (Next Best Moves) - [ ] [PIVOT] Rebuild sensor calibration logic because current readings fluctuate incorrectly during device tilt → stabilize 1★ rating floor ### Outlook: Declining Users report: The diagnostic utility market is consolidating around apps that provide reliable, calibrated sensor data. EMF Detector (Scanner) remains exposed due to its stagnant release cadence and unresolved accuracy issues, which will likely lead to further rating erosion in the coming quarters. - 🔴 The seven-month release gap indicates the developer has shifted focus, leaving the critical sensor-calibration bug unaddressed for the foreseeable future. - 🔴 Persistent sensor drift during device movement erodes the app's core value proposition, leading to negative sentiment and high churn risk. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Overall Rating | 1/5 | | Total Reviews | 1 | | Sentiment | Upset (10/100) | | Confidence | Medium | | Pricing Model | Freemium | | Platforms | iOS | | Key Features | 3 analyzed | | Outlook | Declining | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **EMF Detector (Scanner)** (this app) | 1/5 | Upset | JongMin Lee | | [Sota Connect: Secure Network](https://marlvel.ai/apps/fi-catconnect-sota) | 4.9/5 | N/A | Cat Connect | | [V2Box - V2ray Client](https://marlvel.ai/apps/v2box-v2ray-client) | 4.6/5 | n/a | techlaim | | [App For Siri Commands Tips](https://marlvel.ai/apps/app-for-siri-commands-tips) | N/A/5 | N/A | Anh La Phan Son | | [avoVPN Desktop](https://marlvel.ai/apps/avovpn-desktop) | N/A/5 | N/A | Avocado VPN Technologies | | [Bin Days - Bin Reminder](https://marlvel.ai/apps/bin-days-bin-reminder) | N/A/5 | N/A | Vicki Partridge | ## Company Profile - **Developer:** JongMin Lee - **Website:** [https://keumdaniel.blogspot.com](https://keumdaniel.blogspot.com) ## Data Sources & Links - **App Store ID:** 6759452241 - **Dev Site:** [Official Website](https://keumdaniel.blogspot.com) - **Sources:** Developer website content, App store metadata, User reviews. ## Related Intel Reports - [*Sota Connect: Secure Network*](https://marlvel.ai/apps/fi-catconnect-sota) (Cat Connect) · 4.9/5 Rating - [*V2Box - V2ray Client*](https://marlvel.ai/apps/v2box-v2ray-client) (techlaim) · 4.6/5 Rating - [*App For Siri Commands Tips*](https://marlvel.ai/apps/app-for-siri-commands-tips) (Anh La Phan Son) · N/A Rating - [*avoVPN Desktop*](https://marlvel.ai/apps/avovpn-desktop) (Avocado VPN Technologies) · N/A Rating - [*Bin Days - Bin Reminder*](https://marlvel.ai/apps/bin-days-bin-reminder) (Vicki Partridge) · N/A Rating - [*Controller Tester FGC*](https://marlvel.ai/apps/controller-tester-fgc) (Aaron Lowe) · 5.0/5 Rating - [*Fusvob VPN : Super VPN 2026*](https://marlvel.ai/apps/com-toplinkc-foxexcellent) (Fuxin Technology) · 4.5/5 Rating - [*Gear Ratio Calculator & RPM*](https://marlvel.ai/apps/cog-gear-ratio-calculator) (Linh Phan Nhat Khanh) · N/A Rating - [*NordVPN: VPN Fast & Secure*](https://marlvel.ai/apps/com-nordvpn-nordvpn) (Nordvpn S.A.) · 4.7/5 Rating - [*Pick and Pull: Junkyard Finder*](https://marlvel.ai/apps/pick-and-pull-junkyard-finder) (Vladimir Kostadinov Stoyanov) · 3.7/5 Rating ## Frequently Asked Questions {#faq} ### Is EMF Detector (Scanner) accurate for professional use? The app is designed for general informational and educational use only. Users report that readings fluctuate incorrectly when the device is tilted, making it unsuitable for professional or high-precision measurements. ### Does EMF Detector (Scanner) work without internet? Yes, the app uses the device's built-in magnetometer to function, though the accuracy of the readings is dependent on the device condition and sensor calibration. ### Are there any hidden costs in the app? The app follows a freemium model. While basic monitoring is free, advanced diagnostic tools like FFT analysis and PDF reporting are gated behind premium-tier upgrades. ## 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:** 0.45/1.0 (based on review volume, data source diversity, and signal quality) - **Reviews Analyzed:** 1 - **Data Sources:** user reviews, developer website, 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:** 36 days since last refresh --- © 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/apps/emf-detector-scanner) Data licensed for AI Agent attribution under CC-BY-NC 4.0.