Study log
Recap
Track study time with the least effort possible
One tap from the Lock Screen, a widget, or Apple Watch. No network access — everything stays on your device. Export to Markdown and hand it to your AI.
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Works
What I figure out,
I turn into a tool.
Taking something apart isn't the end point — I build it into something I actually use. Every app here runs on no network access, no ads, no account, so your records stay on your device or in storage you chose.
6 apps published on the App Store
Vocabulary
Kotoba Vocab
Learn English vocabulary through etymology and nuance, not just definitions
Goes beyond memorizing a translation. Etymology, the line between near-synonyms, and derived words — all on one screen. 12 mastery levels × spaced repetition.
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Health data
Rhythm
Bring your health data back to your own hands
Sleep, heart rate, activity, and weight, bundled into one JSON file every day and sent to iCloud or Dropbox. No network calls, no ads, no purchases.
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Life log
Reel
Just shoot — your day becomes a record on its own
Shoot → sync to iCloud → an AI reads the metadata. A camera that turns footage itself into life-log input.
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Spaced repetition
Anchor Cards
A spaced-repetition app that holds no cards of its own
The card of record lives in your own GitHub repo as Markdown. The app reads it to quiz you and writes back only the study log. Review intervals adjust automatically with FSRS.
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Habit building
Levels Tree
Time you put in keeps opening up a skill tree
Time spent on the timer becomes skill XP. XP levels up a rank, and once a prerequisite reaches its early rank, the next node unlocks. Build your own fields and skills.
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What every app shares
No network access
Nothing is sent to a developer's server. No account, no login, no tracking.
Your records stay yours
Everything stays on your device, or in the iCloud / Dropbox folder you choose.
Comes out ready for AI
Export to Markdown or JSON and hand it straight to your own AI or Obsidian.