---
title: "Shun Isayama — Publisher Overview"
type: publisher
publisher: "Shun Isayama"
publisher_slug: "shun-isayama"
canonical_url: "https://marlvel.ai/publishers/shun-isayama"
last_updated: 2026-05-05T14:14:06.137Z
source: Marlvel.ai
license: CC-BY-NC-4.0
citation: "Marlvel.ai — Shun Isayama Publisher Overview"
---
## ⚠ Content Warning

This publisher's portfolio includes apps classified as sensitive (health). Information is aggregated from public sources for informational purposes only. This overview touches health-related apps. It is not medical advice.

---

# Shun Isayama — Publisher Overview

> Providing specialized utility tools for personal management and finance. Helping users track daily habits, finances, and collections with focused, single-purpose applications.

- **Publisher:** Shun Isayama
- **Website:** [https://yurufuwase.com](https://yurufuwase.com)
- **Overview generated:** 2026-05-05
- **License:** CC-BY-NC 4.0

## Executive summary

The publisher operates a high-volume, single-developer model focused on rapid deployment of niche utility tools rather than deep, feature-rich platforms. By saturating specific categories like finance and lifestyle with granular, task-specific apps, they capture long-tail search traffic for highly specific user needs. The strategy relies on breadth and discoverability within the app store ecosystem, prioritizing functional simplicity over complex user retention loops.

## Publisher DNA

- **Primary focus:** Utility and lifestyle tools for personal management
- **Scale:** studio
- **Target audience:** Individuals seeking quick, task-specific solutions for financial tracking, personal logging, and daily organization.

## Portfolio momentum

- **Velocity:** intense
- **Active apps:** 50
- **Abandoned apps:** 0
- **Last major release:** 46 days ago

Released 23 updates across 50 apps in the last 6 months, indicating a high-frequency maintenance and release cycle.

## Aggregated portfolio metrics

- **Total reviews (all apps):** 0
- **Weighted rating:** 0.00 / 5
- **Apps in portfolio:** 50

## Category breakdown

| Category | Apps | Share |
| :--- | :--- | :--- |
| Finance | 18 | 36% |
| Lifestyle | 13 | 26% |
| Entertainment | 5 | 10% |
| Productivity | 3 | 6% |
| Education | 3 | 6% |
| Food & Drink | 2 | 4% |
| Health & Fitness | 1 | 2% |
| Medical | 1 | 2% |
| Games | 1 | 2% |
| Utilities | 1 | 2% |
| Book | 1 | 2% |
| Travel | 1 | 2% |

## Top apps

- **Sports Pedometer** — Flagship health-tracking utility with gamified sports milestones.
- **Card Binder - TCG Manager** — Niche organizational tool for physical trading card collectors.
- **Instant EUR/JPY Calc!** — Representative of the publisher's focus on rapid, single-currency financial conversion.
- **Instant GBP/JPY Calc!** — Part of a series of specialized, bidirectional currency conversion tools.
- **ペットの通院記録** — Specialized medical logging tool for pet health and expense tracking.

## Signature patterns

- High volume of single-purpose utility apps with minimal feature sets.
- Strong concentration in Finance (36%) and Lifestyle (26%) categories.
- Monetization primarily through paid app models.
- Frequent, iterative updates to maintain relevance in niche search queries.
- Focus on simple, text-heavy interfaces for rapid data entry.

## Bottom line

The publisher maintains a high-velocity, low-overhead strategy by targeting fragmented, long-tail utility needs. Their success depends on the continued discoverability of these specific tools rather than the development of a unified platform.

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