Every app shipped under Workstation4. Mostly iOS, a couple that also run on Android and the web. Nearly all are actively maintained; the retired ones keep their page here as a record of what they were.
Fast Kanji Quiz shows a reading, two kanji, and a short countdown. The second kanji is never random: it is picked because it looks like the first (早 and 草) or because it means something adjacent (南 and 西), since the mistakes learners actually make are confusions rather than blanks. All 2,230 JLPT kanji sit in small themed groups you can finish in a sitting, spaced repetition decides what comes back and when, and the kanji meanings themselves are translated into 20 languages, not just the buttons around them.
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 small placement test that maps your proficiency to a CEFR level across 46 languages.
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Turn any list into a series of A-vs-B picks and watch a confidence-rated ranking take shape.
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A daily word puzzle where you swiped across a grid of letter tiles to spell words and clear the board. Retired in 2026.