I build apps
and small tools.

Recent projects

Selected

Two apps, built solo.

01 — 2026

Joshirushi

A travel companion for Japanese castle hunters.

御城印を集める城巡りアプリ。

  • SwiftUI
  • SwiftData
  • App Clip
  • RevenueCat
  • Core Location

Released on the App Store in April 2026 — my first shipped app. The App Clip lets travelers check in at a castle without installing the full app, while the bundled dataset of Japan's 100 most famous castles stays under Apple's 15 MB limit.

On the App Store

02 — 2026

Mentor AI

An interview reflection coach that never leaves your phone.

録音もAI分析も完全オンデバイスで動く面接振り返りアプリ。

  • SwiftUI
  • iOS Speech
  • MLX
  • Gemma 4B

Records practice interviews and turns them into structured feedback — without sending audio or text anywhere. Built on Apple's MLX framework with a quantized Gemma 4B model running entirely on device.

Coming to the App Store

About

Independent. iOS-first.

I'm a solo developer based in Japan, working mostly on iOS. I shipped my first app on the App Store in April 2026, and I'm building the second one now — a privacy-first interview coach that runs entirely on-device.

日本拠点のインディー開発者。iOS を中心にアプリと小さな道具を作っています。

Contact

Say hello.

email
yasudariku1214@gmail.com
github
@Yasuda-Riku