Hi, I'm
Yoshimi Sakamoto
a web developer and designer living in Hokkaido, Japan.
I'm
interested in Java, Vue, Firebase, Frameworks, Startups and Tennis.
Tennis Watch
This app is built specifically for tennis players using Android WearOS
smartwatches. Record your scores, analyze your game, and more!
Full details and features can be found on the dedicated page.
Explore more Taikai Kit
TaikaiKit is the app for seamless sports and competitive events,
benefiting both organizers and participants.
Organizers can efficiently manage registration and easily create league
tables and tournament brackets. Participants enjoy real-time event updates
on their smartphones.
Zensenki
Simplify your tennis match data management with Zensenki, a web
application for Tennis Watch users.
Easily upload match data from your smartwatch to Zensenki on the web, and
effortlessly track and analyze your performance at any time.
Probably released July 2025
Under constructionAbout
On this page, I share my story, my experience in app development, and the skills I've acquired along the way.
My StoryGadget4
My Partners in Work, Play, and Life
MAC mini M4
I went with a non-Apple monitor because of the cost.
YONEX Percept
Got myself a new racket after years.
DAIHATSU Canvas
Isn’t this Kawaii?