--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "KARAOKE GYM" developer_entity: "Masanori Katsuta" bundle_id: "mtomkats.KaraokeGym" app_store_id: "1450063046" category: "Music" primary_platform: "ios" primary_monetization: "Paid" offline_capable: false market_region: "US" platforms: "iOS" app_last_updated: "2024-04-02" report_date: "2026-08-17" last_verified: "2026-08-17T00:00:00.000Z" report_version: "1.0.4" total_reviews: 2 overall_rating: 3 sentiment: "Upset" sentiment_score: 10 confidence: "medium" confidence_score: 0.45 top_complaint_theme: "The voice removal function fails to operate as expected during karaoke sessions for users" review_sample_size: 1 total_review_count: 1 analyzed_review_count: 1 data_age_days: 12 momentum_velocity: "zombie" intelligence_version: 3 tags: ["music", "paid", "upset sentiment", "mobile app", "app review", "app analysis", "karaoke", "enthusiasts", "musicians"] canonical_url: "https://marlvel.ai/apps/karaoke-gym" license: "CC-BY-NC 4.0" content_version: "v2" --- # KARAOKE GYM Intelligence Report ## TL;DR {#tldr} - **Category**: Music Β· Paid - **Signal**: Rating 3 Β· Sentiment Upset - **Recent focus**: The voice removal function fails to operate as expected during karaoke sessions for users (top complaint) > **TL;DR:** KARAOKE GYM is a music app by Masanori Katsuta, rated 3/5 by 2 users, with Upset user sentiment (10/100), available on iOS. > > **Marlvel.ai App Intelligence** - Independent analysis. US Market. No publisher influence. > **Key Insight:** KARAOKE GYM faces Upset user sentiment (3/5 from 2 reviews), with users reporting the voice removal function fails to operate as expected during karaoke sessions for users as the primary concern. ## Quick Facts | Fact | Value | | :--- | :--- | | **Rating** | 3/5 (2 reviews) | | **User Mood** | Upset | | **Category** | Music | | **Developer** | Masanori Katsuta | | **Pricing** | Paid | | **Platforms** | iOS | | **Confidence** | Medium (0.45/1.0) | | **Data Age** | 12d | ## Metadata & Market Performance - **Publisher:** Masanori Katsuta - **Category:** Music - **Target Audience:** Karaoke enthusiasts and musicians who want to practice specific songs from their personal music library. - **Platforms:** iOS - **Version Reviewed:** 1.0.4 - **Report Date:** 2026-08-17 - **Signal Count:** 1 review analyzed - **Confidence:** Medium (0.45/1.0) - **App Store ID (iOS):** 1450063046 - **Bundle ID:** mtomkats.KaraokeGym - **Performance Trend:** Declining - **Data Window:** Analysis based on signals collected up to 2026-08-17 ## Executive Snapshot **What it is:** Karaoke Gym is a music practice utility for iOS that provides vocal removal and playback modification for local audio files. **Why users hire it:** Karaoke Gym removes the dependency on internet connectivity for vocal-practice sessions, serving users who prefer one-time purchases over subscription-based music apps. ## App DNA (Features & Intent) - **[Differentiator] Vocal Removal:** Center cancellation and midrange suppression process to isolate backing tracks from local music files. * *User Intent:* Users seek enhanced value through premium features. - **[Standard] Tempo and Key Adjustment:** Real-time playback modification of tempo (10% to 500%) and key (Β±1 octave) for practice. - **[Standard] AB Repeat:** Looping functionality for specific song intervals to facilitate repetitive practice. ## Market Position {#market-position} Karaoke Gym maintains a low-visibility position in the Music category, currently ranking in the #90s for Paid charts in specific regions. The lack of updates for over 750 days suggests a decline in competitive relevance compared to active audio utilities. ## Monetization Strategy - **Model:** Paid - **Tiers:** $0.99 one-time purchase - **Price:** iOS: $0.99 - **Analysis:** The $0.99 price point targets users seeking a one-time utility purchase without ongoing subscription costs. ## πŸ”΄ User Sentiment (Medium Confidence: 1 of 1 review analyzed) {#user-sentiment} - **Overall Rating:** 3/5 - **Platform Split:** iOS 3.0/5 (2 ratings) - **Overall Sentiment:** Upset ### Top Complaints (Impact Areas) - **The voice removal function fails to operate as expected during karaoke sessions for users** ## SWOT Analysis {#swot} **Core Strengths:** - Offline-first architecture removes dependency on network stability for practice sessions **Growth Levers:** - Integrating modern AI-based vocal separation could replace legacy center-cancellation ## Recent Changes (v2 β†’ v3) {#recent-changes} Karaoke Gym formalized its $0.99 pricing structure and explicitly identified the failure of its core vocal removal feature as a critical product weakness. The app remains in a stagnant state with no development activity, further distancing its legacy center-cancellation technology from modern market standards. **Overall trend**: Declining **Compared at**: 2026-08-17 ### High-impact changes - **[Shifted] Vocal Removal Repositioning** (features) - **[Declined] Core Feature Failure Reported** (sentiment) ### Medium-impact changes - **[Added] Pricing Tier Introduction** (pricing) ## App Momentum (Zombie) {#momentum} - No major updates in 751 days. - Maintenance-only cadence since 2019. > **Cadence:** 3 total versions Β· 0 majors in last 6 months Β· 751 days since last update ## The "So What?" (Strategic Takeaway) {#so-what} KARAOKE GYM is a music app that is a paid app. It holds a 3/5 rating from 2 reviews. > **Bottom Line:** Karaoke Gym's reliance on legacy center-cancellation technology and a multi-year update gap prevents it from competing with modern, AI-driven audio tools. **Best for:** Karaoke enthusiasts and musicians who want to practice specific songs from their personal music library. ### PM Action Plan (Next Best Moves) - [ ] [SUNSET] Sunset the current build because the vocal removal feature is non-functional β†’ stop brand erosion ### Outlook: Declining The market for audio practice tools is shifting toward AI-powered separation, leaving Karaoke Gym's legacy center-cancellation approach obsolete. Without a major technical pivot, the app will continue to lose relevance as users migrate to tools that deliver reliable vocal isolation. - πŸ”΄ The lack of updates for over 750 days indicates a complete cessation of development, leaving the app vulnerable to OS-level breakage. - πŸ”΄ User reports confirm the primary vocal removal feature is non-functional, which destroys the core value proposition for new purchasers. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Overall Rating | 3/5 | | Total Reviews | 2 | | Sentiment | Upset (10/100) | | Confidence | Medium | | Pricing Model | Paid | | Platforms | iOS | | Key Features | 3 analyzed | | Trend | Declining | | Outlook | Declining | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **KARAOKE GYM** (this app) | 3/5 | Upset | Masanori Katsuta | | [BandLab – Music Maker & Beats](https://marlvel.ai/apps/bandlab-music-maker-beats) | 4.8/5 | Excited | BandLab Singapore Pte Ltd | | [Suno - AI Songs, Music, Lyrics](https://marlvel.ai/apps/suno-ai-songs-music) | 4.0/5 | Mixed | Suno, Inc. | | [ヨルシカ](https://marlvel.ai/apps/com-yorushika-sp) | 4.8/5 | N/A | Fanplus, Inc. | | [あいみょん](https://marlvel.ai/apps/net-aimyong-sp) | 4.5/5 | N/A | Fanplus, Inc. | | [γ‚€γƒ³γƒˆγƒͺγ‚Ίγƒ ](https://marlvel.ai/apps/jp-rc-into-rhythm) | 3.5/5 | N/A | RedinC | ## Company Profile - **Developer:** Masanori Katsuta - **Website:** [https://sites.google.com/site/katssoft/home/english-home](https://sites.google.com/site/katssoft/home/english-home) - **Social:** [YouTube](https://youtube.com/shorts) ## Data Sources & Links - **App Store:** [View on Apple Store](https://apps.apple.com/us/app/karaoke-gym/id1450063046?uo=4) - **Dev Site:** [Official Website](https://sites.google.com/site/katssoft/home/english-home) - **Sources:** Developer website content, App store metadata, User reviews. ## Related Intel Reports - [*BandLab – Music Maker & Beats*](https://marlvel.ai/apps/bandlab-music-maker-beats) (BandLab Singapore Pte Ltd) Β· 4.8/5 Rating | Positive Sentiment - [*Suno - AI Songs, Music, Lyrics*](https://marlvel.ai/apps/suno-ai-songs-music) (Suno, Inc.) Β· 4.0/5 Rating - [*ヨルシカ*](https://marlvel.ai/apps/com-yorushika-sp) (Fanplus, Inc.) Β· 4.8/5 Rating - [*あいみょん*](https://marlvel.ai/apps/net-aimyong-sp) (Fanplus, Inc.) Β· 4.5/5 Rating - [*γ‚€γƒ³γƒˆγƒͺγ‚Ίγƒ *](https://marlvel.ai/apps/jp-rc-into-rhythm) (RedinC) Β· 3.5/5 Rating - [*γ‚―γƒͺープハむプ*](https://marlvel.ai/apps/creephyp-sp-browsingapp) (Fanplus, Inc.) Β· N/A Rating - [*γƒžγ‚«γƒ­γƒ‹γˆγ‚“γ΄γ€*](https://marlvel.ai/apps/com-macaroniempitsu-fc) (Fanplus, Inc.) Β· 3.1/5 Rating - [*100.1 Jack FM*](https://marlvel.ai/apps/100-1-jack-fm) (NRG Media) Β· 1.0/5 Rating - [*100.1 WJRZ*](https://marlvel.ai/apps/100-1-wjrz) (Beasley Broadcast Group) Β· 4.8/5 Rating | Excellent Sentiment - [*100.3 The Wolf*](https://marlvel.ai/apps/100-3-the-wolf) (SummitMedia, LLC) Β· 4.1/5 Rating ## Frequently Asked Questions {#faq} ### Is Karaoke Gym worth buying for karaoke practice? Based on user reports, the core vocal removal feature does not function as expected, making it difficult to recommend for karaoke practice in its current state. ### Does Karaoke Gym work with Apple Music or Spotify? No, Karaoke Gym cannot load DRM-protected songs from streaming services like Apple Music or Spotify. It only works with local music files downloaded in advance. ### What is the main limitation of Karaoke Gym? The primary limitation is that the app uses legacy center-cancellation technology for vocal removal, which users report fails to function correctly, and it has not received a major update in over two years. ## 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:** 12 days since last refresh --- Β© 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/apps/karaoke-gym) Data licensed for AI Agent attribution under CC-BY-NC 4.0.