Workstation4 · est. 1997

Small
things,
made with
care.

Workstation4 is a quiet workshop for small, careful software. We build the things we want to use, then ship them: iOS apps, web projects, and the occasional side quest. Out in the wild, with more on the way.

See the apps → Read the blog
Shipping since
1997 →
Apps in the wild
08
// The catalog

Little
apps. Big care.

All apps →
★ Featured · v2.1.6
Language Level Check icon

Language Level Check

A short CEFR placement test in 46 languages, about 40 questions, to help you get a sense of your level in a few minutes.

iOS · Android SwiftUI v2.1.6
iOS · iPadOS
Blinky icon

Blinky

Blinky uses the front camera to count your blinks in real time and gives you a gentle nudge when staring at a screen has dried your eyes out.

 iOS · iPadOS
Sequence icon

Sequence

A timer and routine app that chains countdowns, intervals, checklists, and rests into a single guided flow.

 iOS · iPadOS
Speedometer Tiny icon

Speedometer Tiny

A small GPS speedometer for iPhone with a live speed history chart and a fastest-speed tracker.

 iOS · iPadOS
YearlyQuest icon

YearlyQuest

A heatmap calendar that turns daily habits and metrics into a year you can see at a glance.

 iOS · iPadOS
Ghost Car icon

Ghost Car

Record, compare, and share your drives, with timeline alignment that lines them up and a video-style playback to watch them unfold.

 iOS
WordErase icon

WordErase

A daily word puzzle where you swipe across a grid of letter tiles to spell words and clear the board.

 iOS · iPadOS · Android
Popular Rank icon

Popular Rank

Turn any list into a series of A-vs-B picks and watch a confidence-rated ranking take shape.
// Behind the curtain

Curious who's
building all this?

One developer. Twenty years of iOS. A workshop, not a startup. We don't take clients, we don't run ads, we build the apps we want to use. The about page has the rest.

About the workshop →
// The Dev Blog

Notes from the
workstation.

All posts →
May 26, 2026 · 8 min read

Accepting any correct reading.

A kanji can have several valid readings, and a Japanese keyboard sometimes hands back the character itself instead of the kana you asked for. Here is how I made reading practice in my kanji trainer judge the answer instead of the typing.

Read post →
May 19, 2026 · 8 min read

Climbing the kanji dependency graph.

Most kanji are built from simpler parts, so order matters. Here is how I merged a few open datasets into one ordered set, gated each character behind the ones before it, and let a small static page do the rest.

Read post →