--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "Quick mental calculation" developer_entity: "ERX" bundle_id: "jp.erx.calc" app_store_id: "841970890" category: "Games" primary_platform: "ios" primary_monetization: "Free" offline_capable: false market_region: "US" platforms: "iOS" app_last_updated: "2024-01-17" report_date: "2026-10-25" last_verified: "2026-10-25T00:00:00.000Z" report_version: "10.3" total_reviews: 0 confidence: "low" confidence_score: 0.15 data_age_days: 14 momentum_velocity: "zombie" intelligence_version: 2 tags: ["games", "free", "mobile app", "app review", "app analysis", "casual", "gamers", "interested"] canonical_url: "https://marlvel.ai/apps/quick-mental-calculation" license: "CC-BY-NC 4.0" content_version: "v2" --- # Quick mental calculation Intelligence Report ## TL;DR {#tldr} - **Category**: Games · Free > **TL;DR:** Quick mental calculation is a games app by ERX, available on iOS. > > **Marlvel.ai App Intelligence** - Independent analysis. US Market. No publisher influence. > **Key Insight:** Quick mental calculation is a games app by ERX. ## Quick Facts | Fact | Value | | :--- | :--- | | **Category** | Games | | **Developer** | ERX | | **Pricing** | Free | | **Platforms** | iOS | | **Confidence** | Low (0.15/1.0) | | **Data Age** | 14d | ## Metadata & Market Performance - **Publisher:** ERX - **Category:** Games - **Target Audience:** Casual gamers interested in mental math practice and competitive leaderboard challenges. - **Platforms:** iOS - **Version Reviewed:** 10.3 - **Report Date:** 2026-10-25 - **Signal Count:** 0 reviews analyzed - **Confidence:** Low (0.15/1.0) - **App Store ID (iOS):** 841970890 - **Bundle ID:** jp.erx.calc - **Data Window:** Analysis based on signals collected up to 2026-10-25 ## Executive Snapshot **What it is:** Quick mental calculation is a timed arithmetic practice game for casual users on iOS. **Why users hire it:** It removes the friction of manual math drills by providing an automated, competitive environment that rewards speed. ## App DNA (Features & Intent) - **[Standard] Mental Arithmetic Challenges:** Timed arithmetic calculation exercises requiring rapid input of correct answers. Engagement loop drives session frequency, expanding ad-inventory per active user. - **[Standard] Global Rankings:** Leaderboard system tracking performance across consecutive correct answers. Competitive social mechanic increases session duration, expanding ad-inventory. * *User Intent:* Users seek social connection and competitive engagement with peers. ## Market Position {#market-position} Quick mental calculation operates in the casual education space with a free-to-play model. The lack of updates since early 2024 signals a maintenance-only posture in a category where active content updates are standard. ## Monetization Strategy - **Model:** Free - **Tiers:** Free to play - **Analysis:** The app operates as a free-to-play title with no visible in-app purchases or subscription tiers. ## SWOT Analysis {#swot} **Core Strengths:** - Simple, repeatable core loop sustains session frequency without complex onboarding **Growth Levers:** - Introduction of tiered difficulty levels could increase session duration ## What's New - **Latest (v10.3, 2 years ago):** Updated the marketing URL configuration. ## App Momentum (Zombie) {#momentum} - No major features released in years - Last update limited to marketing URLs > **Cadence:** 1 total versions · 0 majors in last 6 months · 1012 days since last update ## The "So What?" (Strategic Takeaway) {#so-what} Quick mental calculation is a games app that is completely free. > **Bottom Line:** Quick mental calculation maintains a basic arithmetic loop, but the multi-year development silence leaves it vulnerable to more active competitors. Pivoting to a light subscription model or adding social progression would be required to justify further investment. **Best for:** Casual gamers interested in mental math practice and competitive leaderboard challenges. ### PM Action Plan (Next Best Moves) - [ ] [MAINTAIN] Audit ad-fill rates because the app lacks recent feature updates → identify if revenue is declining ### Outlook: Stable The casual math-game market is consolidating around apps that offer social progression and daily rewards. Quick mental calculation is currently exposed to churn as users migrate to titles with more frequent content updates, which will likely erode its remaining ad-inventory value. - ⚪ The app remains in maintenance mode with no significant feature updates for over two years, signaling a stable but stagnant user base. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Total Reviews | 0 | | Confidence | Low | | Pricing Model | Free | | Platforms | iOS | | Key Features | 2 analyzed | | Outlook | Stable | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **Quick mental calculation** (this app) | N/A/5 | N/A | ERX | | [Bingo Cash - Win Real Money](https://marlvel.ai/apps/bingo-cash) | 4.7/5 | Excited | Papaya Gaming | | [Royal Match](https://marlvel.ai/apps/royal-match) | 4.7/5 | n/a | Dream Games | | [Temple Run](https://marlvel.ai/apps/temple-run) | 4.3/5 | Mixed | Imangi Studios, LLC | | [2 Player Games : Offline Games](https://marlvel.ai/apps/2-player-games-offline-games) | 4.8/5 | Thrilled | Moreno Maio | | [Avatar Life - love & bit gacha](https://marlvel.ai/apps/avatar-life-love-bit-gacha) | 3.8/5 | n/a | 101XP LIMITED | ## Company Profile - **Developer:** ERX - **Website:** [https://erx.jp](https://erx.jp) - **Social:** [Facebook](https://www.facebook.com/sharer.php?src=bm) · [X/Twitter](https://twitter.com/intent) · [YouTube](https://www.youtube.com/@user-yd5xu3sf2s) ## Data Sources & Links - **App Store ID:** 841970890 - **Dev Site:** [Official Website](https://erx.jp) - **Sources:** Developer website content, App store metadata. ## Related Intel Reports - [*Bingo Cash - Win Real Money*](https://marlvel.ai/apps/bingo-cash) (Papaya Gaming) · 4.7/5 Rating | Positive Sentiment - [*Royal Match*](https://marlvel.ai/apps/royal-match) (Dream Games) · 4.7/5 Rating - [*Temple Run*](https://marlvel.ai/apps/temple-run) (Imangi Studios, LLC) · 4.3/5 Rating - [*2 Player Games : Offline Games*](https://marlvel.ai/apps/2-player-games-offline-games) (Moreno Maio) · 4.8/5 Rating | Excellent Sentiment - [*Avatar Life - love & bit gacha*](https://marlvel.ai/apps/avatar-life-love-bit-gacha) (101XP LIMITED) · 3.8/5 Rating - [*Ball Eater!*](https://marlvel.ai/apps/ball-eater) (Talha Ekren) · N/A Rating - [*Basketball Sim Leagues*](https://marlvel.ai/apps/basketball-sim-leagues) (Bacci Media) · 5.0/5 Rating - [*Battle Run*](https://marlvel.ai/apps/battle-run) (Game Hive Corp.) · 3.9/5 Rating - [*Bingo Bash: Live Bingo Games*](https://marlvel.ai/apps/bingo-bash-live-bingo-games) (Scopely, Inc.) · 4.5/5 Rating - [*Bingo Drive: Live Clash Tour*](https://marlvel.ai/apps/bingo-drive-live-clash-tour) (Gliding Deer) · 4.7/5 Rating ## Frequently Asked Questions {#faq} ### Is Quick mental calculation suitable for children? The app is rated 4+ and focuses on basic arithmetic, making it appropriate for younger users interested in math practice. ### Does Quick mental calculation have in-app purchases? No, the app is free-to-play and does not currently offer in-app purchases or subscription tiers. ### What is the main difference between Quick mental calculation and other math games? Quick mental calculation focuses specifically on rapid, timed arithmetic challenges and global rankings, whereas other math games often include broader educational curricula or RPG-style progression. ### Are there alternatives to Quick mental calculation? Yes, there are many math-focused games available that offer more frequent updates, social features, and varied difficulty levels. ## 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:** 0.15/1.0 (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:** 14 days since last refresh --- © 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/apps/quick-mental-calculation) Data licensed for AI Agent attribution under CC-BY-NC 4.0.