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Build Android apps
at the speed of thought.

Real Kotlin. Real Jetpack Compose. Sub-100ms hot reload—wirelessly—to your phone, emulator, or browser.

Get started freeRead the docs
localhost:8765
Notes
+
Search notes…
Shopping List
Milk, eggs, bread…
Meeting Notes
Q4 roadmap discussion with the team
Ideas
Dark mode toggle for settings screen
Reminders
Call dentist Monday
+
Connected
live
Last reload
87ms
Hot reloads
14
Build time
1m 12s
Changes
3
12:42:01
⚡ NotesScreen.kt → 87ms
12:42:34
⚡ NoteItem.kt → 91ms
12:43:12
⚡ NotesScreen.kt → 84ms
Latest build
v1.0.0 · 5.2 MB
Download APK
<100ms
Hot reload — wirelessly, every time
3
Preview targets: phone, emulator, browser
1 cmd
npx jetstart dev — that's all it takes
Hot Reload

Skip the wait.
See it instantly.

JetStart compiles changed Kotlin files to DEX bytecode and injects them into your running app over Wi-Fi—no full rebuild, no restart.

How it works
Full Gradle rebuild2–5 min
JetStart hot reload87ms
Preview anywhere

One server.
Three targets.

Physical device, Android emulator, or the browser—your choice. Switch with a single flag. No reconfiguration.

Wireless
Physical Device
Scan QR. App appears on your phone in seconds over Wi-Fi or hotspot.
$jetstart dev
AVD
Android Emulator
Auto-detects your running AVD. Installs and launches the app automatically.
$jetstart dev --emulator
No device needed
Browser Preview
Compiles Kotlin to JavaScript via kotlinc-js. Renders live Material You HTML in any browser.
$jetstart dev --web
Simple CLI

From zero to
live in 60 seconds.

No Android Studio. No Gradle plugin config. Install the CLI, create a project, run jetstart dev, and watch your code appear on your device.

01npm install -g @jetstart/cli
02jetstart create my-app
03jetstart dev --web

Start shipping faster today.

One command. Sub-100ms feedback. Your app on your device, instantly.

$npm install -g @jetstart/cli