Luma.
A sleep tracker that turns the night into something calm.
- Client
- Luma Health
- Platform
- iOS, Android
- Timeline
- 14 weeks
- Year
- 2026
- downloads in year one
- 1.2M
- App Store rating
- 4.9
- day-30 retention
- 41%
We took sleep tracking out of the spreadsheet and put it on one quiet screen. Night mode, guided audio and a morning summary, all designed to be used one-handed and half asleep.
The challenge
Luma had accurate sleep data and an app nobody opened twice. Every screen was a chart, and the people it was built for were tired, in the dark, and holding the phone in one hand. The numbers were right; the experience was working against them.
What we did
We started by cutting. Eleven tabs became three, and the home screen became a single ring that answers one question: how did I sleep? Everything after 9 PM switches to a dimmer palette with larger targets, and the wind-down audio starts in one tap from the lock screen.
The outcome
Luma launched on both stores in the same week and passed a million downloads inside its first year. More telling than the installs: four in ten people who try it are still using it a month later.
Scope
- Product strategy
- Interface design
- iOS (Swift)
- Android (Kotlin)
Colour palette
- #1D1B3D
- #13122F
- #A99DFF
- #6D5BFF
- #FF7A59
What made the difference.
- 01
One-handed by default
Every primary action sits in the bottom third of the screen, sized for a thumb that is barely awake.
- 02
A palette that dims itself
After sunset the interface drops contrast and blue light in steps, following the phone’s own schedule.
- 03
A summary, not a report
One sentence and one score come first. The charts are there for anyone who wants to dig.
Up next,
Convoy.
An operations dashboard that runs a whole fleet from one screen.