--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "危険物乙5類取扱者試験問題集　りすさんシリーズ" developer_entity: "Kazuki Baba" bundle_id: "jp.co.joker.kazuki.dangerous.substance.dangerous-substance5" app_store_id: "906600645" google_play_id: "jp.co.joker.kazuki.dangerous.substance5" category: "Education" primary_platform: "ios" primary_monetization: "Paid" offline_capable: true market_region: "US" platforms: "iOS & Android" app_last_updated: "2026-04-26" report_date: "2026-11-03" last_verified: "2026-11-03T00:00:00.000Z" report_version: "1.21" total_reviews: 0 confidence: "low" confidence_score: 0.2 data_age_days: 11 momentum_velocity: "maintenance" intelligence_version: 2 tags: ["education", "paid", "mobile app", "app review", "app analysis", "individuals", "preparing", "class"] canonical_url: "https://marlvel.ai/apps/jp-co-joker-kazuki-dangerous-substance-dangerous-s" license: "CC-BY-NC 4.0" content_version: "v2" --- # 危険物乙5類取扱者試験問題集　りすさんシリーズ Intelligence Report ## TL;DR {#tldr} - **Category**: Education · Paid > **TL;DR:** 危険物乙5類取扱者試験問題集　りすさんシリーズ is a education app by Kazuki Baba, available on iOS & Android. > > **Marlvel.ai App Intelligence** - Independent analysis. US Market. No publisher influence. > **Key Insight:** 危険物乙5類取扱者試験問題集　りすさんシリーズ is a education app by Kazuki Baba. ## Quick Facts | Fact | Value | | :--- | :--- | | **Category** | Education | | **Developer** | Kazuki Baba | | **Pricing** | Paid | | **Platforms** | iOS & Android | | **Confidence** | Low (0.2/1.0) | | **Data Age** | 11d | ## Metadata & Market Performance - **Publisher:** Kazuki Baba - **Category:** Education - **Target Audience:** Individuals preparing for the Class 5 Hazardous Materials Handler Examination in Japan. - **Platforms:** iOS & Android - **Version Reviewed:** 1.21 - **Report Date:** 2026-11-03 - **Signal Count:** 0 reviews analyzed - **Confidence:** Low (0.2/1.0) - **App Store ID (iOS):** 906600645 - **Bundle ID:** jp.co.joker.kazuki.dangerous.substance.dangerous-substance5 - **Google Play ID:** jp.co.joker.kazuki.dangerous.substance5 - **Data Window:** Analysis based on signals collected up to 2026-11-03 ## Executive Snapshot **What it is:** 危险物乙5類取扱者試験問題集　りすさんシリーズ is a specialized education app for Japanese Class 5 Hazardous Materials certification candidates, featuring a large question bank and exam simulation. **Why users hire it:** The app removes the friction of carrying physical textbooks and provides immediate feedback on accuracy, which is the primary trigger for students preparing for high-stakes certification exams. ## App DNA (Features & Intent) - **[Standard] Exam-Style Practice Mode:** Simulates the actual 35-question exam format with randomized questions. - **[Differentiator] Error Memory and Prioritization:** Automatically tracks incorrect answers and prioritizes them in future study sessions. * *User Intent:* Users want visibility into their own performance and progress. - **[Differentiator] Offline Study Capability:** Allows full app functionality without an internet connection. * *User Intent:* Users want uninterrupted access without internet dependency. ## Market Position {#market-position} 危险物乙5類取扱者試験問題集　りすさんシリーズ holds a niche position in the Education category, relying on a paid-upfront model that contrasts with the ad-heavy free alternatives. The app's lack of recent updates (190 days) suggests a stable, maintenance-mode strategy rather than aggressive market share expansion. ## Monetization Strategy - **Model:** Paid - **Tiers:** Paid version at $2.99 (iOS) / $2.49 (Android), LITE/Trial version with ad-supported access - **Price:** iOS: $2.99 | Android: $2.49 - **Analysis:** Paid model with a low-cost entry point ($2.49-$2.99) and an ad-supported trial tier to drive conversion. ## SWOT Analysis {#swot} **Core Strengths:** - Offline-first architecture removes connectivity dependency for transit-based study - Error-tracking algorithm creates a defensible efficiency barrier against static PDF study guides **Growth Levers:** - Localized pricing adjustments could capture more volume in the price-sensitive student segment - Adding a community-driven discussion forum for complex chemistry topics could increase daily active usage ## What's New - **Latest (v1.22, 7 months ago):** Updates consist exclusively of routine system maintenance and bug fixes. ## App Momentum (Maintenance) {#momentum} - Ships routine system maintenance only. - Last major update 7 months ago. > **Cadence:** 2 total versions · 0 majors in last 6 months · 190 days since last update · 22 days avg between updates ## The "So What?" (Strategic Takeaway) {#so-what} 危険物乙5類取扱者試験問題集　りすさんシリーズ is an education app that is a paid app. > **Bottom Line:** 危险物乙5類取扱者試験問題集　りすさんシリーズ maintains a stable position by serving a specific, high-intent certification niche. A content-refresh sprint would defend the paid-tier value against free, more frequently updated alternatives. **Best for:** Individuals preparing for the Class 5 Hazardous Materials Handler Examination in Japan. ### PM Action Plan (Next Best Moves) - [ ] [INVEST] Refresh question bank content because the 190-day maintenance gap risks syllabus obsolescence → maintain competitive relevance ### Outlook: Stable The certification prep market is consolidating around platforms that offer real-time syllabus updates and social learning. 危险物乙5類取扱者試験問題集　りすさんシリーズ remains stable in its niche, but the lack of recent updates (190 days) signals a passive posture that will eventually lose ground to more active competitors. - ⚪ The 190-day update gap suggests a mature product lifecycle, which minimizes development costs but risks long-term user churn. - 🔴 Lack of social features or community integration leaves the app vulnerable to modern, interactive study platforms. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Total Reviews | 0 | | Confidence | Low | | Pricing Model | Paid | | Platforms | iOS & Android | | Key Features | 3 analyzed | | Outlook | Stable | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **危険物乙5類取扱者試験問題集　りすさんシリーズ** (this app) | N/A/5 | N/A | Kazuki Baba | | [ALPA: Lernspiele für Kinder](https://marlvel.ai/apps/alpa-lernspiele-fur-kinder) | N/A/5 | N/A | ALPA Kids OU | | [ATPdigital (Legacy)](https://marlvel.ai/apps/atpdigital-legacy) | 2.0/5 | n/a | Bristol Groundschool International Ltd | | [BDS Next](https://marlvel.ai/apps/bds-next) | 4.6/5 | Mixed | Raison Thomas | | [Catbus Student](https://marlvel.ai/apps/catbus-student) | 4.1/5 | N/A | Cohota Join Stock Company | | [Chinese Tibetan Dictionary](https://marlvel.ai/apps/chinese-tibetan-dictionary) | 5.0/5 | Thrilled | Lobsang Monlam16922404891 | ## Company Profile - **Developer:** Kazuki Baba - **Website:** [https://risusan.net/?page_id=37](https://risusan.net/?page_id=37) ## Data Sources & Links - **App Store ID:** 906600645 - **Google Play ID:** jp.co.joker.kazuki.dangerous.substance5 - **Dev Site:** [Official Website](https://risusan.net/?page_id=37) - **Sources:** Developer website content, App store metadata. ## Related Intel Reports - [*ALPA: Lernspiele für Kinder*](https://marlvel.ai/apps/alpa-lernspiele-fur-kinder) (ALPA Kids OU) · N/A Rating - [*ATPdigital (Legacy)*](https://marlvel.ai/apps/atpdigital-legacy) (Bristol Groundschool International Ltd) · 2.0/5 Rating - [*BDS Next*](https://marlvel.ai/apps/bds-next) (Raison Thomas) · 4.6/5 Rating - [*Catbus Student*](https://marlvel.ai/apps/catbus-student) (Cohota Join Stock Company) · 4.1/5 Rating - [*Chinese Tibetan Dictionary*](https://marlvel.ai/apps/chinese-tibetan-dictionary) (Lobsang Monlam16922404891) · 5.0/5 Rating | Excellent Sentiment - [*Insights to Behavior*](https://marlvel.ai/apps/insights-to-behavior) (Insights to Behavior) · N/A Rating - [*Legasthenie & LRS Trainer*](https://marlvel.ai/apps/legasthenie-lrs-trainer) (Matthias Aigner) · N/A Rating - [*Lyceum Leaf Parent*](https://marlvel.ai/apps/lyceum-leaf-parent) (Techcess Business Solutions (Pvt) Ltd) · N/A Rating - [*MapTap.gg*](https://marlvel.ai/apps/nibble-games-maptap) (MapTap Inc) · 4.9/5 Rating | Excellent Sentiment - [*Money Matrix (CAD)*](https://marlvel.ai/apps/money-matrix-cad) (Blooming Kids Software LLC) · 5.0/5 Rating ## Frequently Asked Questions {#faq} ### Is 危险物乙5類取扱者試験問題集　りすさんシリーズ suitable for beginners? Yes, the app includes a textbook and a 160-term glossary, making it appropriate for users starting their preparation from scratch. ### Does the app work without an internet connection? Yes, the app is designed for offline use, which allows for study during transit or in areas without connectivity. ### What is the difference between the LITE and paid versions? The LITE version is ad-supported, while the paid version removes ads and provides an uninterrupted study experience. ### Are there free alternatives to this app? There are many free, ad-supported exam prep apps available in the store, though they may lack the specific error-tracking and offline features found here. ## 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:** 0.2/1.0 (based on review volume, data source diversity, and signal quality) - **Reviews Analyzed:** 0 - **Data Sources:** 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:** 11 days since last refresh --- © 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/apps/jp-co-joker-kazuki-dangerous-substance-dangerous-s) Data licensed for AI Agent attribution under CC-BY-NC 4.0.