Every app shipped under Workstation4. Mostly iOS, one Android, several with Apple Watch / iPad support. All actively maintained.
Language Level Check is a native SwiftUI app with a roughly 40-question CEFR placement test that estimates a level from A1 through C1, or the JLPT, HSK, and TOPIK equivalents for Japanese, Mandarin, and Korean. Questions cover cloze, reading comprehension, listening, word reorder, and minimal pairs, and the whole test runs offline because every blueprint ships inside the app. Test content is also delivered over a content server keyed by per-language checksums, so questions can be corrected without waiting on an App Store release.
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.
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A timer and routine app that chains countdowns, intervals, checklists, and rests into a single guided flow.
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A small GPS speedometer for iPhone with a live speed history chart and a fastest-speed tracker.
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A heatmap calendar that turns daily habits and metrics into a year you can see at a glance.
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Record, compare, and share your drives, with timeline alignment that lines them up and a video-style playback to watch them unfold.
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A daily word puzzle where you swipe across a grid of letter tiles to spell words and clear the board.
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Turn any list into a series of A-vs-B picks and watch a confidence-rated ranking take shape.