Submarine 3D simulator icon
短期記憶強化 icon

Katsushi Kuroki

For fans of historical naval combat simulations and individuals interested in basic cognitive memory exercises.

2apps1.3(203)GamesEducation

Snapshot

Who is Katsushi Kuroki?

Developing niche tactical simulations and cognitive training exercises for mobile users.

Target audience

Fans of historical naval combat simulationsIndividuals interested in basic cognitive memory exercises

Active nemesis

Spiffy

Other rivals

Portfolio

Free 2
2
apps
Education1
Games1

Last updated

Submarine 3D simulator

v1.1.17

7mo ago

Active

Publisher DNA

What defines Katsushi Kuroki?

Publisher DNA

Primary focus

Mobile games and education apps

Scale

indie

Target audience

Fans of historical naval combat simulations and individuals interested in basic cognitive memory exercises.

Signature Patterns

  • Monetization exclusively via free-to-play models
  • Focus on niche, single-mechanic gameplay loops
  • Minimalist UI design across both gaming and educational titles
Active

Portfolio momentum

Released 6 updates across 2 apps in the last 6 months, indicating an active development cycle despite the small portfolio size.

Last release 118d agoActive apps 1

Portfolio

What does Katsushi Kuroki ship?

Apps

2 apps analysed

Submarine 3D simulator icon
Submarine 3D simulator

Authentic German submarine simulator

2.6(203)
View Intel →
  • Minimalist 3x3 grid interface provides low-barrier entry for casual play.

Rivals

Who does Katsushi Kuroki compete with?

The rivals identified

Nemeses(1)

Spiffy

known forSpiffy

1 app5.0Education

Spiffy competes by targeting the same cognitive improvement segment but scales through enterprise-grade gamification and analytics, positioning itself as a professional training tool rather than a casual game.

Same space(4)

Institute for Excellence in Writing

known forMemory Mentor

1 app4.0Education

This app targets the same memory-improvement demographic by offering multi-profile tracking and customizable frequency settings.

OrangeOrApple.com

known forFlashcards Deluxe

1 app4.5Education

This is a long-standing incumbent that competes by offering highly flexible, power-user features for memory and study management.

Suha Alkhoury

known forREPETI

1 app4.3Education

REPETI captures the same audience by focusing on the science of spaced repetition to improve long-term memory retention.

Teleprompter

known forFlashcards maker - AI generate

1 app3.6Education

It competes for the same educational mindshare by leveraging AI to automate content creation for memory retention.

The Analyst's Read

The bottom line on Katsushi Kuroki

Bottom line

The publisher maintains a small, experimental portfolio with inconsistent category alignment. Future viability depends on establishing a more focused product strategy to move beyond basic, low-engagement utility apps.

Frequently asked questions

How many apps does Katsushi Kuroki publish?
Katsushi Kuroki has 2 apps tracked by Marlvel, primarily in the Education category.
What kind of apps does Katsushi Kuroki make?
Katsushi Kuroki's portfolio is concentrated in Education and Games, with an average rating of 1.3/5 across rated apps.
What is Katsushi Kuroki's top app?
By review volume across the portfolio, Submarine 3D simulator is Katsushi Kuroki's best-known app tracked by Marlvel.

What fed this analysis

Apps analyzed:
2
With full intel:
0
With overview:
2
Website scraped:
no
Social presence:
yes

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 Katsushi Kuroki, its developer, the app publisher, Apple, or Google Play. All trademarks, logos, and screenshots referenced remain the property of their respective owners.

Cite this report

Marlvel.ai. “Katsushi Kuroki intelligence.” Updated 2026-05-11. https://marlvel.ai/publishers/katsushi-kuroki

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Data licensed under CC-BY-NC 4.0