---
title: "Yasuyoshi Ota — Publisher Overview"
type: publisher
publisher: "Yasuyoshi Ota"
publisher_slug: "yasuyoshi-ota"
canonical_url: "https://marlvel.ai/publishers/yasuyoshi-ota"
last_updated: 2026-05-05T18:49:00.598Z
source: Marlvel.ai
license: CC-BY-NC-4.0
citation: "Marlvel.ai — Yasuyoshi Ota Publisher Overview"
---
## ⚠ Content Warning

This publisher's portfolio includes apps classified as sensitive (adult). Information is aggregated from public sources for informational purposes only. This publisher has apps with mature themes. Viewer discretion is advised.

---

# Yasuyoshi Ota — Publisher Overview

> Providing cognitive training and productivity tools for users seeking mental exercise and task management. Focused on simple, utility-driven mobile experiences.

- **Publisher:** Yasuyoshi Ota
- **Website:** [https://app.brain-workout.org](https://app.brain-workout.org)
- **Founded:** 2015
- **Overview generated:** 2026-05-05
- **License:** CC-BY-NC 4.0

## Executive summary

Yasuyoshi Ota operates as a solo developer maintaining a long-tail portfolio of niche educational and productivity tools. The publisher’s strategy relies on a high volume of specialized, low-maintenance apps that target specific cognitive tasks or utility functions rather than broad-market engagement. The primary tension is the sustainability of this fragmented, legacy-heavy catalog, which lacks a unified brand identity or cross-promotion strategy.

## Publisher DNA

- **Primary focus:** Cognitive training and utility apps
- **Scale:** studio
- **Target audience:** Individuals interested in self-improvement, cognitive training, and specific productivity tracking.
- **Origin:** The publisher has been active since at least 2015, managing a personal portfolio of iOS and iPadOS applications.

## Portfolio momentum

- **Velocity:** intense
- **Active apps:** 33
- **Abandoned apps:** 0
- **Last major release:** 22 days ago

Released 20 updates across the portfolio in the last 6 months, demonstrating a high level of ongoing maintenance for existing titles.

## Aggregated portfolio metrics

- **Total reviews (all apps):** 26,779
- **Weighted rating:** 3.89 / 5
- **Apps in portfolio:** 33

## Category breakdown

| Category | Apps | Share |
| :--- | :--- | :--- |
| Education | 14 | 42.4% |
| Lifestyle | 4 | 12.1% |
| Sports | 4 | 12.1% |
| Productivity | 3 | 9.1% |
| Games | 3 | 9.1% |
| Utilities | 2 | 6.1% |
| Entertainment | 2 | 6.1% |
| Business | 1 | 3% |

## Top apps

- **Jigsaw Puzzle Maker for iPad L** — Largest app by review volume with over 14,000 ratings.
- **Missing Num** — Significant educational title with over 11,000 ratings.
- **GP Counter** — Primary productivity tool with 168 ratings.
- **Kinetic Visual Acuity Lite** — Niche sports-training utility with 70 ratings.
- **N'Back** — Core cognitive training app within the education category.

## Signature patterns

- Heavy reliance on free-to-use models without complex in-app purchase tiers.
- Strong focus on cognitive training tasks, specifically N-Back and visual acuity exercises.
- Minimalist, utility-first UI design across all categories.
- High frequency of updates to maintain compatibility for legacy titles.
- Portfolio composition heavily weighted toward Education and Lifestyle categories.

## Bottom line

Yasuyoshi Ota maintains a stable, high-velocity portfolio of niche utilities that serve specific cognitive and productivity needs. The publisher's strength lies in long-term maintenance of a broad catalog rather than aggressive user acquisition.

---
© 2026 Marlvel.ai | [Publisher apps index](https://marlvel.ai/api/llm/publishers/yasuyoshi-ota) | [Methodology](https://marlvel.ai/api/llm/methodology)
Data licensed under CC-BY-NC 4.0.

---
© 2026 Marlvel.ai | [Full publisher profile](https://marlvel.ai/publishers/yasuyoshi-ota) | [Publisher apps index](https://marlvel.ai/api/llm/publishers/yasuyoshi-ota) | [Methodology](https://marlvel.ai/api/llm/methodology)
Data licensed under CC-BY-NC 4.0.