Kaikoku — a chuuni pocket-watch alarm I built from my junior-high notebook

I'm an indie developer from Japan, and I just launched Kaikoku.

The short version: I found a notebook I wrote in junior high — full of an entire "magic system" I invented (twelve zodiac spells, solar arts, seal-curses). Pure chuuni, that fantasy-prone teenage phase. Instead of cringing, I decided to actually build it.

Kaikoku is an antique pocket watch that lives in your palm. The chain swings on real physics. Snap the hunter lid shut and magic charges; open it and the day unseals. By night you wind the dial to cast one of twelve arcana; by day the sun answers with solar arts. Every hour it checks its keeper via Face ID.

Underneath all that staging, it's a genuinely functional clock app: alarms with six bells, a timer, a chronograph with Live Activities, an Apple Watch companion, widgets, and StandBy. The fantasy is the skin; the timekeeping is real.

Some technical bits I had fun with:

- Entirely SwiftUI, built on AlarmKit (iOS 26), Live Activities / Dynamic Island, StandBy, and Apple Watch.

- You don't set the time with a date picker — you drag the hands across the dial. Drag angles are converted to time via atan2, with haptic feedback every minute, like the click of a real movement.

- The dial "clouds over" based on the real time of day and shows the season's constellation at night.

Everything is free. There's discreet advertising you can remove forever with a one-time purchase.

App Store: https://apps.apple.com/us/app/id6789449975

Website: https://kaikoku.cavemen.jp/

I'd love your honest feedback, especially from anyone who also kept one of those notebooks 🕰️