Okojyo-Soft
A one-person iOS studio
Small tools, made one at a time —
in a quiet corner of the woods.
From a melting-snow forest, a solo developer crafts iOS apps. The ones built for everyone, everywhere: CmdDeck and SubnetDeck.
In big companies, small inconveniences slip through the cracks.
I pick them up — one at a time, by hand.
One pair of hands, season after season.
❄ Winter white—🌱 toward the first buds of spring—grown one at a time
All published on the App Store. Three travel beyond Japan; three more are made for Japan.
English readyA reference for IT, anywhere.
Apps built to travel beyond Japan — multilingual, offline, and ready the moment something breaks.
Find any command in a second.
English & Japanese1,510 commands and 120 symptom-to-fix flows, all fully offline. Windows, Linux, PowerShell, Cisco, Cloud — 15 fields in your pocket. Nine languages, one-time purchase, no subscription.
Subnet math to IP plans, even with no signal.
9 languagesAn IPv4 / IPv6 subnet calculator, automatic VLSM allocation and site-by-site IP plans with .xlsx, CSV and Markdown export. 69 addressing playbooks and 11 Learn topics, fully offline. Free to start; Premium is a one-time purchase.
Log every IT request, fast.
English & JapaneseCapture spoken requests by voice; an on-device AI suggests next steps. Eight color-coded categories, status tracking, and due-date reminders keep nothing slipping through. CSV / Markdown export, fully offline, one-time purchase. iPhone & iPad.
Three more apps, currently available in Japanese on the Japan App Store. Here's what they do.
A field handbook for people newly assigned to in-house IT and system administration in Japan — a 90-day roadmap, first-response flows for common incidents, and certification practice, all in one.
Lay your life out as a grid of weekly tiles — about 5,200 of them — and see at a glance how long your retirement savings will last. Diagnosis, cash-flow, and what-if scenarios, free and on-device.
A speaking-first English trainer for Japanese learners. Fifty-six everyday scenes — travel, work, school, errands — practised out loud using only junior-high grammar, three minutes at a time. Speech recognition scores each attempt, and a three-choice tap mode keeps the practice going when you can’t speak aloud. Recognition and AI both run on-device, so nothing you say leaves the phone. Free for five sessions a day.
Okojyo-Soft is a one-person iOS software studio. Whether it's "what do I do on day one of an IT job?" or "will my money last?", the goal is the same: turn an everyday worry into a tool you can actually see and use.
Not big features — just a little less friction, every day. Like an ermine through the seasons, these grow slowly but surely. Feedback is always welcome.
Working the floor, running the hills, napping in the meadow — an ordinary day for the ermine who makes these tools.
Updates, technical notes, and the thinking behind it all.