본문으로 건너뛰기
n.today
Chronyan 앱 아이콘

Chronyan

ios · 2026– · In development

Care and symptoms for a multi-cat household on one timeline — the day you switched food sits next to the day they threw up

  • Today screen — Luna's six entries for the day: meal 28 g, water 78 ml, weight 4.33 kg, and a sleeping respiratory rate of 42 breaths/min outlined in red for crossing the threshold, with overdue heartworm prevention and water fountain cleaning below
  • Records tab timeline — a summary of 367 entries, 108 events and 2 photos, with the day stacked in time order (water, weight, feces, urine, meal) under a row of pattern filter chips
  • Heart dashboard in the Care tab — an urgent banner at 42 breaths/min telling the owner to call the vet, and a month of readings where a dashed threshold line sits at 30 and a baseline of 22-27 spikes only today
  • Care items screen — the item list filtered by shared, per-cat, or pattern. Meal and water intake belong to each cat, while bowl washing and water fountain cleaning are shared and carry 7-day and 14-day cycles
About this project

An iOS app that puts a multi-cat household’s daily care and health changes on a single timeline. Available in Japanese, Korean, and English.

What it does

  • Trace cause — food changes, litter changes, and the start of a medication land on the same timeline as symptoms. “Did the vomiting start right after I switched food?” gets answered from the record, not from memory
  • House-level care — some chores belong to the house, not to a cat: scrubbing a litter box, swapping a water fountain filter. Per-cat records and shared records are kept apart
  • A pattern engine — a tracked item is data, not a feature. Every item is built from five patterns — daily check, measurement, recurring, event, chronic condition — so twenty more items add no code
  • Care mode — when a cat has a chronic condition, what matters for that condition moves to the front: a sleeping respiratory rate timer, blood glucose and insulin, per-condition dashboards, emergency guidance
  • Records stay on the device — local-first with file protection; only the backup goes to iCloud. No account, no server

Why I built it

This is the third attempt.

2026-02 · NyanLog (Flutter). I built over a hundred features, and that is why it stopped. The stack was never the problem — not deciding what to cut was.

2026-05 · Chronicat (SwiftUI). I rebuilt from the skeleton. The principle that carried forward came from here: twenty items are not twenty features — an item is data, a pattern is code. It stalled at five screens.

2026-08 · Chronyan. I merged the two repositories. Most of that merge was not addition but subtraction — fifteen of the hundred existing features became preset data, thirty-five moved out of v1, and the screens collapsed to seven. Six kinds of notification became one reminder setting per item.

Judgment calls

Market research knocked down two of the things I meant to lead with. “Multi-cat support” was already free in a competitor with 1,400 reviews, and “SRR measurement” is given away by pharmaceutical companies as standalone apps. So I changed the pitch — the durable difference was context, not the feature. An app that only measures SRR does not know whether that number belongs to the day you switched food.

Being unreleased was the only opening. Neither app had ever shipped, so the schema could be redesigned from scratch. With a single real user, that call would have been off the table.

I chose native. On cost alone, staying on Flutter was cheaper — 17.5 weeks with Android included, against 25 weeks for iOS alone. I went with SwiftUI anyway, on cold start, photo thumbnail scrolling, Dynamic Type and VoiceOver, and widgets. Android is deferred, not dropped; I’ll decide again after iOS is in real use.