---
title: "Tatsuhiko Koyama — Publisher Overview"
type: publisher
publisher: "Tatsuhiko Koyama"
publisher_slug: "tatsuhiko-koyama"
canonical_url: "https://marlvel.ai/publishers/tatsuhiko-koyama"
last_updated: 2026-04-24T10:58:21.179Z
source: Marlvel.ai
license: CC-BY-NC-4.0
citation: "Marlvel.ai — Tatsuhiko Koyama Publisher Overview"
---
# Tatsuhiko Koyama — Publisher Overview

> Providing utility-focused mobile tools and sports analytics for users seeking organized tracking and performance data.

- **Publisher:** Tatsuhiko Koyama
- **Website:** [https://wasabi-apps.co.jp](https://wasabi-apps.co.jp)
- **Headquarters:** Yokohama, Japan
- **Employees:** 1-10
- **Overview generated:** 2026-04-24
- **License:** CC-BY-NC 4.0

## Executive summary

Tatsuhiko Koyama (Wasabi Applications) operates as a solo-led developer studio focusing on high-utility, niche tracking applications rather than mass-market consumer entertainment. The publisher's moat lies in deep feature sets for specific hobbies and household management—such as frame-by-frame bowling analytics—which target power users willing to pay upfront for specialized functionality. The primary strategic signal is a commitment to a 'paid-upfront' model in categories typically dominated by ad-supported or subscription competitors, prioritizing long-term utility over rapid user acquisition.

## Publisher DNA

- **Primary focus:** Niche utility and sports tracking tools
- **Scale:** indie
- **Target audience:** Serious hobbyists and organized homeowners looking for detailed data logging, performance analytics, and inventory management.
- **Origin:** Founded by a former freelance IT engineer with over a decade of experience who sought to bring Japanese-developed services to a global audience.

## Portfolio momentum

- **Velocity:** maintenance
- **Active apps:** 2
- **Abandoned apps:** 0

The publisher has released 0 updates across its 2 active apps in the last 6 months, indicating a stable maintenance phase for the existing portfolio.

## Aggregated portfolio metrics

- **Total reviews (all apps):** 207
- **Weighted rating:** 4.43 / 5
- **Apps in portfolio:** 2

## Category breakdown

| Category | Apps | Share |
| :--- | :--- | :--- |
| Sports | 1 | 50% |
| Shopping | 1 | 50% |

## Top apps

- **Best Bowling** — Flagship sports analytics app with 136 reviews and a 4.5-star rating.
- **My Inventory – Home Tracker** — Utility-focused shopping and home management tool with 71 reviews.

## Signature patterns

- Focus on data-heavy tracking and frame-by-frame analytics features
- Utilization of paid-upfront pricing models instead of ad-supported freemium
- High degree of personalization through extensive icon libraries and custom organization
- Targeting specific, high-intent hobbyist and domestic niches

## Bottom line

Wasabi Applications is a disciplined indie developer focused on high-intent utility niches with a premium pricing strategy. Their high weighted rating signals strong product-market fit among power users who value detailed data logging over casual UX.

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