Sleep-diary app for a UK sleep-health company

Sleep diaries are a standard tool in sleep coaching and cognitive behavioural therapy for insomnia: every morning you record when you went to bed, how long it took to fall asleep, how often you woke up and how rested you feel. On paper, most people give up after a few days, and practitioners receive incomplete, hard-to-read sheets.

The client wanted a simple app that makes the morning entry take less than a minute, keeps people motivated and produces a clean report they can share with their coach.

We designed the diary entry as a short sequence of large, thumb-friendly inputs (time pickers, sliders and single-tap choices) instead of a long form. A calendar view shows completed days at a glance, and charts reveal patterns such as time to fall asleep or sleep efficiency over the weeks.

Local reminders gently prompt the user each morning. With one tap, the diary can be exported as a PDF and emailed to a practitioner.

• App: React Native with TypeScript, React Navigation (tabs and stacks), react-native-calendars and chart components built on SVG.
• Reminders: Notifee for reliable local notifications on both platforms.
• Reports: on-device PDF generation and native mail composer integration.
• Quality: Firebase Analytics for privacy-conscious usage insights and Crashlytics for crash reporting.
• Data: diary entries stored on the device by default, which keeps sensitive health data under the user's control.

The app turns a tedious paper routine into a one-minute habit and gives practitioners readable, complete data. It is a good example of what we mean by focused MVPs: one job, done very well. See our app development service for more.