--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "Ohms Law" developer_entity: "Pro Certs Software Ltd" bundle_id: "com.procerts.ohmslaw" app_store_id: "590727537" category: "Utilities" primary_platform: "ios" primary_monetization: "Free" offline_capable: false market_region: "US" platforms: "iOS & Android" app_last_updated: "2025-07-28" report_date: "2026-10-13" last_verified: "2026-10-13T00:00:00.000Z" report_version: "1.3.9" total_reviews: 120 overall_rating: 4.2 sentiment: "Excited" sentiment_score: 65 confidence: "medium" confidence_score: 0.65 top_praise_theme: "The calculator provides a simple and convenient way to perform essential car audio math calculations" top_complaint_theme: "Intrusive advertisement placement interrupts the typing experience and clutters the user interface during calculations" review_sample_size: 34 total_review_count: 34 analyzed_review_count: 34 data_age_days: 32 momentum_velocity: "maintenance" intelligence_version: 4 nemesis: "Conduit Bending" competitor_count: 11 tags: ["utilities", "free", "excited sentiment", "mobile app", "app review", "app analysis", "uk-based", "electricians", "audio"] canonical_url: "https://marlvel.ai/apps/ohms-law" license: "CC-BY-NC 4.0" content_version: "v2" --- # Ohms Law Intelligence Report ## TL;DR {#tldr} - **Category**: Utilities · Free - **Signal**: Rating 4.2 · Sentiment Excited - **Recent focus**: Intrusive advertisement placement interrupts the typing experience and clutters the user interface during calculations (top complaint) · The calculator provides a simple and convenient way to perform essential car audio math calculations (top praise) > **TL;DR:** Ohms Law is a utilities app by Pro Certs Software Ltd, rated 4.2/5 by 120 users, with Excited user sentiment (65/100), available on iOS & Android. > > **Marlvel.ai App Intelligence** - Independent analysis. US Market. No publisher influence. > **Key Insight:** Ohms Law maintains Excited user sentiment (4.2/5 from 120 reviews), with users consistently praising the calculator provides a simple and convenient way to perform essential car audio math calculations. ## Quick Facts | Fact | Value | | :--- | :--- | | **Rating** | 4.2/5 (120 reviews) | | **User Mood** | Excited | | **Category** | Utilities | | **Developer** | Pro Certs Software Ltd | | **Pricing** | Free | | **Platforms** | iOS & Android | | **Confidence** | Medium (0.65/1.0) | | **Data Age** | 32d | ## Metadata & Market Performance - **Publisher:** Pro Certs Software Ltd - **Category:** Utilities - **Target Audience:** UK-based electricians and car audio enthusiasts requiring quick, on-site electrical reference tools. - **Platforms:** iOS & Android - **Version Reviewed:** 1.3.9 - **Report Date:** 2026-10-13 - **Signal Count:** 34 reviews analyzed - **Confidence:** Medium (0.65/1.0) - **App Store ID (iOS):** 590727537 - **Bundle ID:** com.procerts.ohmslaw - **Google Play ID:** com.procerts.ohmslaw - **Performance Trend:** Mixed - **Data Window:** Analysis based on signals collected up to 2026-10-13 ## Executive Snapshot **What it is:** Ohms Law is a utility app for calculating electrical power, current, resistance, and voltage on iOS and Android. **Why users hire it:** The app removes the friction of manual electrical math for field technicians, serving as a gateway to the developer's paid certification services. ## App DNA (Features & Intent) - **[Standard] Ohm's Law Calculator:** Calculates voltage, current, resistance, and power by requiring only two input values. - **[Differentiator] Electrical Reference Library:** Access to technical charts and reference data for electrical calculations. ## Market Position {#market-position} Ohms Law maintains a stable utility presence with a 4.28 rating across 120 total ratings. The lack of major updates over the last 10 months signals a maintenance-mode position that limits its ability to compete with high-cadence rivals. ## Monetization Strategy - **Model:** Free - **Tiers:** Free version with ad support - **Analysis:** The app operates as a free, ad-supported utility designed to funnel users toward the developer's paid certification software. ## 🟢 User Sentiment (Medium Confidence: 34 of 34 reviews analyzed) {#user-sentiment} - **Overall Rating:** 4.2/5 - **Platform Split:** iOS 4.3/5 (7 ratings) | Android 4.2/5 (113 ratings) - **Overall Sentiment:** Excited ### Top Praises - **The calculator provides a simple and convenient way to perform essential car audio math calculations** - **Users appreciate the utility of the app for specific technical tasks within the car audio hobby** ### Top Complaints (Impact Areas) - **Intrusive advertisement placement interrupts the typing experience and clutters the user interface during calculations** ## SWOT Analysis {#swot} **Core Strengths:** - Lightweight interface reduces cognitive load for quick math - Cross-platform availability increases user reach **Growth Levers:** - Introduce paid ad-free tier to improve usability - Integrate regulatory reference data to increase professional utility ## Recent Changes (v3 → v4) {#recent-changes} User feedback now highlights specific workflow friction caused by aggressive ad placement and interface limitations, while the app's strategic role has been clarified as a lead-generation funnel for the developer's paid certification services. **Overall trend**: Mixed **Compared at**: 2026-10-13 ### High-impact changes - **[Added] Ad-placement friction** (sentiment) - **[Shifted] Business model clarification** (positioning) ### Medium-impact changes - **[Shifted] Target audience expansion** (audience) - **[Added] New usability weaknesses** (swot) ## Rivals Landscape {#rivals} > Competitive positioning identified by AI analysis of app features, category, and market signals. ### Ohms Law vs Conduit Bending - **[Conduit Bending](https://marlvel.ai/apps/conduit-bending)** by xNeat.com: This app captures the same professional electrician demographic by solving complex field math problems that often accompany basic Ohm's Law calculations. - **Key differences:** - Integrates NEC reference data, providing regulatory compliance that simple calculators cannot offer to professional contractors. - Features a specialized conduit calculation engine that addresses specific physical installation challenges beyond basic electrical theory. - Maintains a high release cadence, signaling a robust development cycle that keeps the tool relevant for professionals. ### Contenders (Strong Challengers) - **[kVA (Single and Three Phase)](https://marlvel.ai/apps/kva-single-and-three-phase)** by Webtoweb: It competes directly by offering specialized electrical power conversions that extend the utility of basic Ohm's Law calculations. - Provides specific support for three-phase power calculations, a critical gap in basic Ohm's Law calculators. - Boasts a significantly larger user base and review volume, establishing higher social proof within the category. - **[WAGO](https://marlvel.ai/apps/wago)** by WAGO Kontakttechnik GmbH & Co. KG: WAGO leverages its industry-standard hardware reputation to provide a utility app that bridges the gap between calculation and component selection. - Connects users directly to a dealer search and product catalog, creating a tangible path to monetization. - Offers offline planning tools that ensure utility for electricians working in remote or signal-deprived job sites. - **[Mike Holt's Electrical Toolbox](https://marlvel.ai/apps/mike-holt-s-electrical-toolbox)** by Mike Holt Enterprises: This app is a direct competitor for the professional electrician's attention, bundling Ohm's Law with broader electrical sizing and code-based tools. - Includes equipment-specific sizing features that provide higher value to licensed contractors than generic calculators. - Backed by a well-known industry educator, providing a level of trust and authority that independent apps lack. - **[Electrical Engineering Toolkit](https://marlvel.ai/apps/electrical-engineering-toolkit)** by Vladislav Zhirnov: It targets the broader electronics engineering market, offering a massive suite of tools that dwarfs this app's single-function focus. - Includes advanced PCB and signal integrity tools, catering to hardware engineers rather than just field electricians. - Provides a comprehensive RF and analog essentials suite, making it a one-stop shop for electronics hobbyists. ### Peers (What They Do Better) - **[Tire Pressure Calculator](https://marlvel.ai/apps/tire-pressure-calculator)** by Titan International, Inc.: While in a different technical domain, it shares the 'single-purpose utility' category and competes for the same limited mobile screen real estate. - Features terrain-specific optimization logic that provides specialized value for heavy machinery and agricultural equipment operators. - Utilizes a dual-mode interface to accommodate both quick-check users and those requiring advanced technical adjustments. - **[Firestone AG Tyres](https://marlvel.ai/apps/firestone-ag-tyres)** by Bridgestone Europe: It occupies the same 'niche utility' space, serving professionals who need specific calculations to ensure safety and operational efficiency. - Focuses heavily on safety and efficiency optimization, aligning the tool with corporate liability and maintenance standards. - Maintains a long-standing presence in the market, providing a stable, albeit dated, utility for agricultural professionals. - **[Orenda](https://marlvel.ai/apps/orenda)** by Hasa Inc.: It is a specialized calculator for water chemistry, competing for the same 'professional field tool' user base as this app. - Integrates an educational academy platform, turning a simple calculator into a recurring engagement and learning hub. - Includes a rewards program that incentivizes long-term app retention and brand loyalty among pool service professionals. - **[pCAM Pro - Camera Tools](https://marlvel.ai/apps/com-eubank-pcam-pro)** by David Eubank: It serves as a benchmark for high-end professional utility apps that successfully monetize complex field calculations. - Offers a sophisticated field-of-view preview, demonstrating how to visualize abstract calculations for better user experience. - Maintains a very high update frequency, ensuring compatibility with the latest hardware and professional industry standards. ### New Kids on the Block (What's Innovative) - **[Build Specs](https://marlvel.ai/apps/build-specs)** by Luke Kazmierowicz: This newcomer threatens this app by bundling Ohm's Law with other essential construction calculations, increasing its utility for general contractors. - Bundles voltage drop calculations with structural tools like stair and joist sizers, capturing a broader construction workflow. - **[Moro AgriExpert Farm Calc](https://marlvel.ai/apps/moro-agriexpert-farm-calc)** by BMAC INFOTECH: It represents the trend of hyper-specialized calculators entering the market, competing for the same 'field utility' user segment. - Provides highly specific agricultural inputs like seed rates and spray calibration, targeting a distinct professional niche. ## What's New - **Latest (v1.3.9, 10 months ago):** Updated for Android 35 and minor UI refinements. ## App Momentum (Maintenance) {#momentum} - Ships bug fixes only. - Last major release ten months ago. > **Cadence:** 2 total versions · 0 majors in last 6 months · 301 days since last update · 2 days avg between updates ## The "So What?" (Strategic Takeaway) {#so-what} Ohms Law is a market-leading utilities app that is completely free. With a 4.2/5 rating from 120 reviews, it delivers strong user satisfaction. > **Bottom Line:** Ohms Law's utility as a quick-calc tool is undermined by aggressive ad placement that disrupts the professional workflow. Introducing an ad-free tier would unlock revenue from the existing user base while mitigating the primary driver of negative sentiment. **Best for:** UK-based electricians and car audio enthusiasts requiring quick, on-site electrical reference tools. ### PM Action Plan (Next Best Moves) - [ ] [INVEST] Ship ad-free paid tier because ad placement is the top-cited user complaint → improve retention ### Feature Gaps vs Competitors - Regulatory reference data (available in Conduit Bending but missing here) ### Outlook: Stable The market for field-utility calculators is consolidating around apps that offer regulatory compliance and broader project-workflow support. Ohms Law remains exposed to churn as its maintenance-mode cadence prevents it from answering the feature-rich toolkits currently capturing the professional electrician demographic. - 🔴 The 10-month gap since the last major release signals a maintenance-only posture that leaves the app vulnerable to feature-rich competitors. - 🔴 Intrusive ad placement interrupts the typing experience, which compounds the frustration already visible in the mixed sentiment score. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Overall Rating | 4.2/5 | | Total Reviews | 120 | | Sentiment | Excited (65/100) | | Confidence | Medium | | Pricing Model | Free | | Platforms | iOS & Android | | Key Features | 2 analyzed | | Trend | Mixed | | Outlook | Stable | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **Ohms Law** (this app) | 4.2/5 | Excited | Pro Certs Software Ltd | | [pCAM Pro - Camera Tools](https://marlvel.ai/apps/com-eubank-pcam-pro) | 4.9/5 | Thrilled | David Eubank | | [Build Specs](https://marlvel.ai/apps/build-specs) | N/A/5 | N/A | Luke Kazmierowicz | | [Moro AgriExpert Farm Calc](https://marlvel.ai/apps/moro-agriexpert-farm-calc) | N/A/5 | N/A | BMAC INFOTECH | | [Orenda](https://marlvel.ai/apps/orenda) | 4.7/5 | Excited | Hasa Inc. | | [WAGO](https://marlvel.ai/apps/wago) | 4.8/5 | Excited | WAGO Kontakttechnik GmbH & Co. KG | ## Company Profile - **Developer:** Pro Certs Software Ltd - **Website:** [https://www.procertssoftware.com/](https://www.procertssoftware.com/) ## Data Sources & Links - **App Store ID:** 590727537 - **Google Play ID:** com.procerts.ohmslaw - **Dev Site:** [Official Website](https://www.procertssoftware.com/) - **Sources:** Developer website content, About us / company information, App store metadata, User reviews. ## Related Intel Reports - [*pCAM Pro - Camera Tools*](https://marlvel.ai/apps/com-eubank-pcam-pro) (David Eubank) · 4.9/5 Rating | Excellent Sentiment - [*Build Specs*](https://marlvel.ai/apps/build-specs) (Luke Kazmierowicz) · N/A Rating - [*Moro AgriExpert Farm Calc*](https://marlvel.ai/apps/moro-agriexpert-farm-calc) (BMAC INFOTECH) · N/A Rating - [*Orenda*](https://marlvel.ai/apps/orenda) (Hasa Inc.) · 4.7/5 Rating | Positive Sentiment - [*WAGO*](https://marlvel.ai/apps/wago) (WAGO Kontakttechnik GmbH & Co. KG) · 4.8/5 Rating | Positive Sentiment - [*Tire Pressure Calculator*](https://marlvel.ai/apps/tire-pressure-calculator) (Titan International, Inc.) · 4.7/5 Rating | Positive Sentiment - [*Firestone AG Tyres*](https://marlvel.ai/apps/firestone-ag-tyres) (Bridgestone Europe) · 5.0/5 Rating - [*kVA (Single and Three Phase)*](https://marlvel.ai/apps/kva-single-and-three-phase) (Webtoweb) · 4.2/5 Rating | Excellent Sentiment - [*Conduit Bending*](https://marlvel.ai/apps/conduit-bending) (xNeat.com) · 4.8/5 Rating - [*Mike Holt's Electrical Toolbox*](https://marlvel.ai/apps/mike-holt-s-electrical-toolbox) (Mike Holt Enterprises) · 4.6/5 Rating | Excellent Sentiment ## Frequently Asked Questions {#faq} ### Is Ohms Law suitable for professional electricians? Ohms Law provides basic calculation tools, but professional electricians often prefer apps like Conduit Bending that include regulatory NEC reference data for compliance. ### Does Ohms Law have intrusive advertisements? Yes, users report that advertisement placement frequently blocks input fields and interrupts the calculation workflow. ### What is a good alternative to Ohms Law? Users needing more advanced features should consider kVA for three-phase power or Conduit Bending for regulatory-compliant electrical work. ## 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:** 0.65/1.0 (based on review volume, data source diversity, and signal quality) - **Reviews Analyzed:** 34 - **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:** 32 days since last refresh --- © 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/apps/ohms-law) Data licensed for AI Agent attribution under CC-BY-NC 4.0.