---
schema_type: "SoftwareApplication"
entity_type: "Mobile Application"
app_name: "SOLO [Nr.19]"
developer_entity: "apeSoft"
bundle_id: "com.densitygs.Solo"
app_store_id: "884781236"
category: "Music"
primary_platform: "ios"
primary_monetization: "Free"
offline_capable: false
market_region: "US"
platforms: "iOS"
app_last_updated: "2021-10-03"
report_date: "2026-08-13"
last_verified: "2026-08-13T00:00:00.000Z"
report_version: "2.2.2"
total_reviews: 7
overall_rating: 4.4
sentiment: "Upset"
sentiment_score: 10
confidence: "medium"
confidence_score: 0.4
top_complaint_theme: "Users report the app forces additional payments for features that should be included in the base license"
review_sample_size: 1
total_review_count: 1
analyzed_review_count: 1
data_age_days: 4
momentum_velocity: "zombie"
intelligence_version: 3
tags: ["music", "free", "upset sentiment", "mobile app", "app review", "app analysis", "professional", "musicians,", "music"]
canonical_url: "https://marlvel.ai/apps/solo-nr-19"
license: "CC-BY-NC 4.0"
content_version: "v2"
---

# SOLO [Nr.19] Intelligence Report

## TL;DR {#tldr}

- **Category**: Music · Free
- **Signal**: Rating 4.43 · Sentiment Upset
- **Recent focus**: Users report the app forces additional payments for features that should be included in the base license (top complaint)

> **TL;DR:** SOLO [Nr.19] is a music app by apeSoft, rated 4.43/5 by 7 users, with Upset user sentiment (10/100), available on iOS.
>
> **Marlvel.ai App Intelligence** - Independent analysis. US Market. No publisher influence.

<!-- speakable-start -->
> **Key Insight:** SOLO [Nr.19] faces Upset user sentiment (4.43/5 from 7 reviews), with users reporting users report the app forces additional payments for features that should be included in the base license as the primary concern.
<!-- speakable-end -->

## Quick Facts

| Fact | Value |
| :--- | :--- |
| **Rating** | 4.43/5 (7 reviews) |
| **User Mood** | Upset |
| **Category** | Music |
| **Developer** | apeSoft |
| **Pricing** | Free |
| **Platforms** | iOS |
| **Confidence** | Medium (0.4/1.0) |
| **Data Age** | 4d |

## Metadata & Market Performance
- **Publisher:** apeSoft
- **Category:** Music
- **Target Audience:** Professional musicians, music students, and performers specializing in the works of Karlheinz Stockhausen.
- **Platforms:** iOS
- **Version Reviewed:** 2.2.2
- **Report Date:** 2026-08-13
- **Signal Count:** 1 review analyzed
- **Confidence:** Medium (0.4/1.0)
- **App Store ID (iOS):** 884781236
- **Bundle ID:** com.densitygs.Solo
- **Performance Trend:** Declining
- **Data Window:** Analysis based on signals collected up to 2026-08-13

<!-- section:executive-snapshot -->
## Executive Snapshot
**What it is:** SOLO [Nr.19] is a digital emulation tool for performing Karlheinz Stockhausen's 1966 composition on iOS.
**Why users hire it:** Musicians hire this app to replicate complex analog feedback setups digitally, enabling unique, unrepeatable live performances of a specific academic work.
<!-- /section:executive-snapshot -->

<!-- section:features -->
## App DNA (Features & Intent)
- **[Differentiator] Digital Feedback System:** Algorithm replicates the original 1966 analog feedback setup for Stockhausen's Solo, allowing soloists to create polyphonic music via accumulation.
- **[Differentiator] Controlled Alea Parameters:** Input management for macroscopic and microscopic order parameters allows performers to define unique, unrepeatable versions of the composition.
<!-- /section:features -->

<!-- section:market-position -->
## Market Position {#market-position}

The app occupies a singular niche in the Music category, serving as the primary digital tool for Stockhausen's work. Its lack of recent updates (1,667 days) signals a shift away from active market competition toward a legacy utility status.
<!-- /section:market-position -->

## Monetization Strategy
- **Model:** Free
- **Tiers:** Free
- **Analysis:** The app is offered as a free utility for a highly specialized musical niche, functioning as a brand-building tool for the developer's broader electronic music software catalog.

<!-- section:sentiment -->
## 🔴 User Sentiment (Medium Confidence: 1 of 1 review analyzed) {#user-sentiment}
- **Overall Rating:** 4.43/5
- **Platform Split:** iOS 4.4/5 (7 ratings)
- **Overall Sentiment:** Upset
- **Note:** The 4.43/5 store rating reflects cumulative history, while the Upset sentiment reflects recent user reviews analyzed by our AI pipeline.

### Top Complaints (Impact Areas)

- **Users report the app forces additional payments for features that should be included in the base license**

<!-- /section:sentiment -->
<!-- section:swot -->
## SWOT Analysis {#swot}

**Core Strengths:**
- Academic authority as the primary tool for Stockhausen's specific work

**Growth Levers:**
- Expansion into broader academic music curriculum partnerships


<!-- /section:swot -->
## Recent Changes (v2 → v3) {#recent-changes}

The app's competitive profile has shifted from a stable utility to a high-risk product due to emerging user complaints regarding deceptive monetization practices.

**Overall trend**: Declining
**Compared at**: 2026-08-13

### High-impact changes
- **[Declined] Emergence of monetization complaints** (sentiment)
- **[Shifted] Increased focus on brand risk** (positioning)

### Medium-impact changes
- **[Improved] Feature set expansion and repositioning** (features)
- **[Shifted] Audience scope expansion** (audience)

<!-- section:momentum -->
## App Momentum (Zombie) {#momentum}

- No major updates in 1,667 days.
- Maintenance mode status confirmed.

> **Cadence:** 5 total versions · 0 majors in last 6 months · 1667 days since last update

<!-- /section:momentum -->

<!-- section:so-what -->
## The "So What?" (Strategic Takeaway) {#so-what}

SOLO [Nr.19] is a music app that is completely free.
It holds a 4.43/5 rating from 7 reviews.

<!-- speakable-start -->
> **Bottom Line:** Users report: SOLO [Nr.19] provides unique value for Stockhausen performers, but the perceived deceptive billing practices alienate its core academic audience, so the developer must clarify the license scope to prevent further brand damage.
<!-- speakable-end -->

**Best for:** Professional musicians, music students, and performers specializing in the works of Karlheinz Stockhausen.

<!-- section:pm-actions -->
### PM Action Plan (Next Best Moves)

- [ ] [PIVOT] Audit monetization transparency because user reviews allege deceptive gating of core features → restore user trust
<!-- /section:pm-actions -->

<!-- section:outlook -->
### Outlook: Declining

The app remains a static utility for a narrow niche, but the combination of stagnant development and aggressive monetization creates a trust deficit. Unless the developer clarifies the licensing model, the app will continue to alienate the very academic community it aims to serve, eventually forcing users to seek alternative performance solutions.

- 🔴 Negative sentiment regarding monetization transparency (gating core features) creates a churn risk for the academic user base.
- ⚪ The lack of updates for over 1,600 days signals the app is in maintenance mode, limiting its ability to address user complaints.
<!-- /section:outlook -->

<!-- /section:so-what -->

<!-- section:metrics -->
## Key Metrics Summary

| Metric | Value |
| :--- | :--- |
| Overall Rating | 4.43/5 |
| Total Reviews | 7 |
| Sentiment | Upset (10/100) |
| Confidence | Medium |
| Pricing Model | Free |
| Platforms | iOS |
| Key Features | 2 analyzed |
| Trend | Declining |
| Outlook | Declining |
<!-- /section:metrics -->

## Competitor Comparison

| App | Rating | Sentiment | Developer |
| :--- | :--- | :--- | :--- |
| **SOLO [Nr.19]** (this app) | 4.43/5 | Upset | apeSoft |
| [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. |
| [イントリズム](https://marlvel.ai/apps/jp-rc-into-rhythm) | 3.5/5 | N/A | RedinC |

## Company Profile
- **Developer:** apeSoft
- **Website:** [https://www.apesoft.it](https://www.apesoft.it)
- **Social:** [Facebook](https://www.facebook.com/apesoft.it) · [X/Twitter](https://twitter.com/apescarbo)

## Data Sources & Links
- **App Store:** [View on Apple Store](https://apps.apple.com/us/app/solo-nr-19/id884781236?uo=4)
- **Dev Site:** [Official Website](https://www.apesoft.it)
- **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) · 4.8/5 Rating | Positive Sentiment
- [*Suno - AI Songs, Music, Lyrics*](https://marlvel.ai/apps/suno-ai-songs-music) (Suno, Inc.) · 4.0/5 Rating
- [*ヨルシカ*](https://marlvel.ai/apps/com-yorushika-sp) (Fanplus, Inc.) · 4.8/5 Rating
- [*あいみょん*](https://marlvel.ai/apps/net-aimyong-sp) (Fanplus, Inc.) · 4.5/5 Rating
- [*イントリズム*](https://marlvel.ai/apps/jp-rc-into-rhythm) (RedinC) · 3.5/5 Rating
- [*クリープハイプ*](https://marlvel.ai/apps/creephyp-sp-browsingapp) (Fanplus, Inc.) · N/A Rating
- [*マカロニえんぴつ*](https://marlvel.ai/apps/com-macaroniempitsu-fc) (Fanplus, Inc.) · 3.1/5 Rating
- [*100.1 Jack FM*](https://marlvel.ai/apps/100-1-jack-fm) (NRG Media) · 1.0/5 Rating
- [*100.1 WJRZ*](https://marlvel.ai/apps/100-1-wjrz) (Beasley Broadcast Group) · 4.8/5 Rating | Excellent Sentiment
- [*100.3 The Wolf*](https://marlvel.ai/apps/100-3-the-wolf) (SummitMedia, LLC) · 4.1/5 Rating

## 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:** 0.4/1.0 (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:** 4 days since last refresh

---
© 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/apps/solo-nr-19)
Data licensed for AI Agent attribution under CC-BY-NC 4.0.