Game — PCReleased ()
A DOG'S DAYS
A short adventure, around 40–50 minutes long, that follows the days shared by a dog and an old man.
Details ↗Independent studioYokohama, Japan
Apps, games, and small stories.
Small apps and games,
made to sit beside
everyday life.
Catechin Studio is an independent studio that creates small apps and games and develops digital products through freelance engineering.
We pay attention to everyday memories, seasons, the passing of time, and small emotions—creating stories and textures that linger after the experience.
01 / Works & Projects
Works
A collection of released works and projects currently in development.
Utility app — Web / PWAReleased ()
UNTIL FILLED.
A daily photo calendar app for saving one photo each day and watching the calendar gradually fill up.
Details ↗Smart glasses app — Even G2Released ()
Fidget Toys for Smart Glasses
A tiny fidget app for the Even G2. Use it during idle moments, or when you want to quietly reset your pace. Search for “Fidget Toys” in the Even app.
Details ↗Short game — WEB (Smartphone / PC)Released ()
White Horse
A game where all you do is make a horse fly. Made in the hope that someone dear to me can let go of their sadness. A New Year’s card game for 2026.
Details ↗02 / Journal
Journal
A growing record of development logs, studio notes, and news.
A DOG'S DAYS Major Update Now Available — 50% Off Sale Underway
The first major update for A DOG'S DAYS is now live. In addition to new cutscenes and improvements that make the game easier to play, the update features a revised English translation and adds support for Simplified Chinese, Traditional Chinese, and Korean. The game is also 50% off for two weeks, bringing the price down from ¥380 to ¥190. We hope you’ll take this opportunity to give it a try.
View on Steam↗A DOG'S DAYS Major Update Coming August 6 — New Trailer Released
The first major update for A DOG'S DAYS arrives on August 6. To celebrate, the game will also be 50% off for two weeks, so if you haven’t played it yet, we hope you’ll take this opportunity to give it a try. We’ve also created a brand-new trailer—be sure to check it out!
Watch the trailer↗Google Drive Backup Is Now Available in UNTIL FILLED.
You can now back up your photos to Google Drive. Don’t forget to back up the precious photos from your daily life.
View the app↗03 / Freelance
Let’s talk about your development needs.
As a freelance engineer, I work on product development across web applications, business systems, and mobile applications.
From new development to improving existing systems and validating early-stage ideas, I design and implement solutions around the project’s goals and the people who will use them.
Web applications / Business systemsMobile apps / PWAsImprovements and maintenance for existing systemsGames and interactive experiences with GodotAI agent use / ImplementationEarly prototypes / Technical validation
Discuss a development project ↗04 / Contact
Get in touch
For development inquiries, questions about our work, interviews, or media coverage, please contact us by email or through one of the links below.
We will review your message and reply as thoughtfully as possible.