SleepVue

September 2026

SleepVue is a sleep tracker for the UNA Watch: a watch app that records your night, and an iOS companion app that syncs it over Bluetooth and writes it to Apple Health.

Overnight the watch logs heart rate and movement and classifies each interval as awake, light or deep sleep. In the morning the iOS app connects, pulls the new nights and shows each one with its sleep-stage timeline, heart-rate trace and movement graph. With the Apple Health toggle on, every night is also written to Health, so it shows up in Apple's own Sleep Score and Sleep Stages views alongside everything else you track.

Built in under 3 days

I wrote both apps with OpenCode driving the Kimi 3 model — from an empty repo to a working watch app and a companion app on my phone in less than three days.

UNA watch app: about $40 in AI usage
iOS companion app: less than $10
Total: roughly $50 for two working apps

What it does

Bluetooth sync with the watch (FTS protocol v5), with a BLE debug log for troubleshooting
Per-night detail: awake / light / deep stages, heart-rate range and average, movement
Writes each night to Apple Health as sleep-analysis samples
Synced nights are kept on the phone, so the watch only needs to be nearby in the morning

Screenshots

SleepVue home screen: connected to the watch, Apple Health toggle on, two synced nights — Connected and up to date

A single night in SleepVue with sleep stages, heart rate and movement charts — One night: stages, heart rate, movement

SleepVue home screen while the watch is not connected — Watch out of range — nights are kept locally

Apple Health Sleep Score of 88 built from SleepVue data — Apple Health Sleep Score from the same night

Apple Health sleep stages chart showing core and deep sleep from SleepVue — Apple Health sleep stages