What a journal app needs
- Daily entries with rich text
- Guided prompts by niche
- Mood tracking with trends
- Streaks and reminders
- Private by default (local + optional sync)
The screens
| Screen | What it does |
|---|---|
| Timeline | Entries by date, streak header |
| Write | Editor with optional daily prompt |
| Mood Trends | Mood over time chart |
| Prompts | Browse prompt packs (paid) |
| Settings | Reminders, lock, export |
The data model
Entry: date, text, moodScore, promptIdPrompt: text, packUser: reminderTime, lockEnabled
The build prompt (copy this)
Paste this into ShipNative and it becomes a working React Native app with these screens, navigable in a live preview, in about two minutes:
Then iterate with small, screen-specific prompts (“make the primary button bigger”, “add an empty state”), preview on your own phone, and export the full Expo project whenever you want. The full method: how to build an app with AI.
How it makes money
Subscription via prompt packs + insights ($3–5/mo). Privacy positioning (on-device) is a differentiator worth stating on the paywall.
Implementation and the revenue math for every model: how to make money from an app. When you’re ready to ship: App Store and Google Play publishing guides.
Build it now
The prompt above is free to run at shipnative.dev — working journal app on your phone today, full code export, no credit card.