--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "Simple Soroban (Abacus)" developer_entity: "Bruno Takahashi Carvalhas de Oliveira" bundle_id: "dev.btco.SimpleSorobanIOS" app_store_id: "6787463185" category: "Education" primary_platform: "ios" primary_monetization: "Free" offline_capable: false market_region: "US" platforms: "iOS" app_last_updated: "2026-07-30" report_date: "2026-09-06" last_verified: "2026-09-06T00:00:00.000Z" report_version: "1.0" total_reviews: 2 overall_rating: 5 confidence: "low" confidence_score: 0.2 data_age_days: 70 momentum_velocity: "maintenance" intelligence_version: 3 tags: ["education", "free", "mobile app", "app review", "app analysis", "students", "learning", "arithmetic,"] canonical_url: "https://marlvel.ai/apps/simple-soroban-abacus" license: "CC-BY-NC 4.0" content_version: "v2" --- # Simple Soroban (Abacus) Intelligence Report ## TL;DR {#tldr} - **Category**: Education · Free - **Signal**: Rating 5 > **TL;DR:** Simple Soroban (Abacus) is a education app by Bruno Takahashi Carvalhas de Oliveira, rated 5/5 by 2 users, available on iOS. > > **Marlvel.ai App Intelligence** - Independent analysis. US Market. No publisher influence. > **Key Insight:** Simple Soroban (Abacus) is a education app by Bruno Takahashi Carvalhas de Oliveira. ## Quick Facts | Fact | Value | | :--- | :--- | | **Rating** | 5/5 (2 reviews) | | **Category** | Education | | **Developer** | Bruno Takahashi Carvalhas de Oliveira | | **Pricing** | Free | | **Platforms** | iOS | | **Confidence** | Low (0.2/1.0) | | **Data Age** | 70d | ## Metadata & Market Performance - **Publisher:** Bruno Takahashi Carvalhas de Oliveira - **Category:** Education - **Target Audience:** Students learning arithmetic, teachers seeking classroom tools, and adults focused on mental calculation training. - **Platforms:** iOS - **Version Reviewed:** 1.0 - **Report Date:** 2026-09-06 - **Signal Count:** 0 reviews analyzed - **Confidence:** Low (0.2/1.0) - **App Store ID (iOS):** 6787463185 - **Bundle ID:** dev.btco.SimpleSorobanIOS - **Performance Trend:** Stable - **Data Window:** Analysis based on signals collected up to 2026-09-06 ## Executive Snapshot **What it is:** Simple Soroban (Abacus) is a free, multi-touch Japanese abacus training app for students and mental calculation learners on iOS. **Why users hire it:** The app removes the cost and ad-based distractions that typically gate arithmetic learning tools, providing a clean, accessible path for mastering Anzan mental calculation techniques. ## App DNA (Features & Intent) - **[Standard] Interactive Tutorials:** Step-by-step lessons covering arithmetic operations using visual bead manipulation. * *User Intent:* Users need clear guidance to understand and adopt the product quickly. - **[Differentiator] Anzan Mode:** Mental calculation training that hides visual beads to force internal visualization. * *User Intent:* Users expect intelligent, adaptive experiences that learn from their behavior. - **[Standard] Freeform Abacus:** Multi-touch, configurable 7-column or 9-column abacus for manual practice. ## Market Position {#market-position} Simple Soroban (Abacus) maintains a 5-star rating on the iOS platform. Its zero-monetization model differentiates it from the broader Education category, where ad-supported or subscription-gated tools are the norm. ## Monetization Strategy - **Model:** Free - **Tiers:** Completely free, no ads, no in-app purchases - **Analysis:** The app operates as a non-monetized personal project with no ads or gated content, prioritizing user trust over revenue. ## SWOT Analysis {#swot} **Core Strengths:** - Multi-touch interface mimics physical hardware - Anzan mode provides specialized mental training - Zero-monetization model builds high user trust **Growth Levers:** - Localized arithmetic curricula for international segments ## Recent Changes (v2 → v3) {#recent-changes} The app has shifted its strategic narrative from a passive niche utility to a high-trust, ad-free alternative in the Education category. This pivot is supported by a refined SWOT analysis that prioritizes user trust as a competitive barrier against ad-supported rivals. **Overall trend**: Stable **Compared at**: 2026-09-06 ### High-impact changes - **[Shifted] Trust-based market positioning** (positioning) ### Medium-impact changes - **[Added] Expanded SWOT analysis** (swot) - **[Added] Explicit 5-star rating mention** (positioning) - **[Shifted] PM Action Item pivot** (positioning) ## App Momentum (Maintenance) {#momentum} - Released version 1.0 in July 2026. - Maintenance-only cadence, no recent updates. > **Cadence:** 1 total versions · 0 majors in last 6 months · 38 days since last update ## The "So What?" (Strategic Takeaway) {#so-what} Simple Soroban (Abacus) is an education app that is completely free. It holds a 5/5 rating from 2 reviews. > **Bottom Line:** Simple Soroban (Abacus) succeeds as a high-trust, ad-free utility, but its maintenance-only state limits its ability to grow against active, ad-supported rivals. Establishing a feedback loop would unlock the data needed to evolve the tool beyond its current static state. **Best for:** Students learning arithmetic, teachers seeking classroom tools, and adults focused on mental calculation training. ### PM Action Plan (Next Best Moves) - [ ] [INVEST] Ship a community-driven feedback loop because the current user base is too small to inform development → increase retention ### Outlook: Stable The education utility market is consolidating around tools that offer consistent, ad-free experiences. Simple Soroban (Abacus) is well-positioned for trust but remains exposed to rivals that maintain a more frequent update cadence to keep users engaged. - ⚪ The app remains in a maintenance-only phase, which limits its ability to capture new users in a competitive education market. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Overall Rating | 5/5 | | Total Reviews | 2 | | Confidence | Low | | Pricing Model | Free | | Platforms | iOS | | Key Features | 3 analyzed | | Trend | Stable | | Outlook | Stable | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **Simple Soroban (Abacus)** (this app) | 5/5 | N/A | Bruno Takahashi Carvalhas de Oliveira | | [AlgoApp - Flashcards](https://marlvel.ai/apps/algoapp-flashcards) | 4.5/5 | n/a | AlgoApp Inc | | [Elevate - Brain Training Games](https://marlvel.ai/apps/elevate-brain-training-games) | 4.7/5 | n/a | The Mind Company | | [Flashcards Deluxe](https://marlvel.ai/apps/flashcards-deluxe) | 4.5/5 | N/A | OrangeOrApple.com | | [Flash Cards Flashcards Maker](https://marlvel.ai/apps/flash-cards-flashcards-maker) | 4.0/5 | Mixed | Infinite Wave Media, LLC | | [Flashcards maker - AI generate](https://marlvel.ai/apps/flashcards-maker-ai-generate) | 4.1/5 | Mixed | Teleprompter LLC | ## Company Profile - **Developer:** Bruno Takahashi Carvalhas de Oliveira - **Website:** [https://btco.dev/simplesoroban/](https://btco.dev/simplesoroban/) ## Data Sources & Links - **App Store ID:** 6787463185 - **Dev Site:** [Official Website](https://btco.dev/simplesoroban/) - **Sources:** Developer website content, App store metadata. ## Related Intel Reports - [*AlgoApp - Flashcards*](https://marlvel.ai/apps/algoapp-flashcards) (AlgoApp Inc) · 4.5/5 Rating - [*Elevate - Brain Training Games*](https://marlvel.ai/apps/elevate-brain-training-games) (The Mind Company) · 4.7/5 Rating - [*Flashcards Deluxe*](https://marlvel.ai/apps/flashcards-deluxe) (OrangeOrApple.com) · 4.5/5 Rating - [*Flash Cards Flashcards Maker*](https://marlvel.ai/apps/flash-cards-flashcards-maker) (Infinite Wave Media, LLC) · 4.0/5 Rating - [*Flashcards maker - AI generate*](https://marlvel.ai/apps/flashcards-maker-ai-generate) (Teleprompter LLC) · 4.1/5 Rating - [*Impulse - Brain Training*](https://marlvel.ai/apps/impulse-brain-training) (GMRD Apps Limited) · 4.6/5 Rating - [*Peak - Brain Training*](https://marlvel.ai/apps/peak-brain-training) (Synaptic Labs) · 4.7/5 Rating - [*자주 틀리는 우리말*](https://marlvel.ai/apps/app--424) (DaolSoft, Co., Ltd.) · N/A Rating - [*달공부 - 한 달 공부 다이어리 + 루틴/공부 타이머*](https://marlvel.ai/apps/azlabs-dalstudy) (SuWon Choi) · N/A Rating - [*타요콘 - 타요 아바타 놀이동화*](https://marlvel.ai/apps/com-kigle-project-tayocon) (KIGLE) · 3.1/5 Rating ## Frequently Asked Questions {#faq} ### Is Simple Soroban (Abacus) completely free? Yes, Simple Soroban (Abacus) is entirely free with no ads, no in-app purchases, and no gated content. ### Is this app suitable for beginners? Yes, the app includes step-by-step interactive tutorials that teach arithmetic from scratch, making it suitable for those with no prior abacus knowledge. ### Does Simple Soroban (Abacus) work offline? The app is designed as a pocket abacus and does not require an account or data collection, allowing for offline use. ## 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:** 70 days since last refresh --- © 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/apps/simple-soroban-abacus) Data licensed for AI Agent attribution under CC-BY-NC 4.0.