SOLO [Nr.19]

SOLO [Nr.19]

By apeSoft

SOLO [Nr.19] is a digital emulation tool for performing Karlheinz Stockhausen's 1966 composition on iOS.

The App DNA

What makes this app unique?

Musicians hire this app to replicate complex analog feedback setups digitally, enabling unique, unrepeatable live performances of a specific academic work.

For Professional musicians, music students, and performers specializing in the works of Karlheinz Stockhausen.

What does it look like?

Key features

Digital Feedback Systemedge

Algorithm replicates the original 1966 analog feedback setup for Stockhausen's Solo, allowing soloists to create polyphonic music via accumulation.

Controlled Alea Parametersedge

Input management for macroscopic and microscopic order parameters allows performers to define unique, unrepeatable versions of the composition.

How much does it cost?

freeFree

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.

Velocity

Dormant developmentShow more...

5 versions in history. Development pace: zombie.

See all version history

Who built it?

apeSoft

12 apps tracked · Music

apeFilterapeFilteriVCS3iVCS3iDensityiDensitySparkle - Cross-SynthesisSparkle - Cross-SynthesisapeMatrixapeMatrixiPulsaretiPulsaretmoodmoodStriaStriaapeDelayapeDelayElectric VintageElectric VintageAccordion VintageAccordion Vintage
Explore the full publisher profile

User Sentiment

What do users think recently?

Fresh user feedback skews upset.

How are ratings & reviews evolving?

App Store
4.43 · 7

What users say, by theme

What Frustrates Users
  • Users report the app forces additional payments for features that should be included in the base license

1 of 1 recent reviews analyzed · limited sample

Read the full review analysis

Competition

Competitive landscape for SOLO [Nr.19]

How's the Music market?

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.

Read the market outlook

The rivals identified

Unlock the deeper market read.

Access the full report for free

The Analyst's Read

Key takeaways for SOLO [Nr.19]

Where is it heading?

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.

The SWOT

Core Strengths
  • Academic authority as the primary tool for Stockhausen's specific work
Critical Frictions 1 weakness inside
Growth Levers
  • Expansion into broader academic music curriculum partnerships
Market Threats 1 threat identified

Next best moves

1 Pivot

Audit monetization transparency because user reviews allege deceptive gating of core features → restore user trust

The counter-intuitive read

Maintaining the app in a stagnant state is a strategic choice…

Read the full take

Since the last report: 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.

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.

Unlock 1 critical friction, 1 market threat and the analyst’s take.

Access the full report for free

Sources

  1. [1] App Store, source

Report last updated

Disclosure: Independent intel to help mobile builders succeed.

AI-powered analysis with automated quality gates, built from publicly available sources. Marlvel.ai is not affiliated with, endorsed by, or sponsored by SOLO [Nr.19], its developer, the app publisher, Apple, or Google Play. All trademarks, logos, and screenshots referenced remain the property of their respective owners.

What's new

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.

declined

Emergence of monetization complaints

shifted

Increased focus on brand risk

improved

Feature set expansion and repositioning

shifted

Audience scope expansion

Cite this report

Marlvel.ai. “SOLO [Nr.19] Intelligence Report.” Updated Aug 13, 2026. https://marlvel.ai/apps/solo-nr-19

Agent Markdown (.md)See methodologyContact support

Data licensed under CC-BY-NC 4.0