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Android App Builder: Code, Preview & Export APK / AAB

Android App Builder illustration

A mini Android Studio in your browser. Create files, write your app, watch it run in a phone frame, make your own signing key and download a real signed APK (for testing) and AAB (for Google Play).

Real APK + AABBuilt in your browserLive phone previewOwn signing key
Illustration of the Android App Builder: code editor, phone preview and APK and AAB export buttons

What you get

📁 Real project treeCreate, rename and delete files and folders, upload images and sounds, and edit manifest, Java and Gradle files.
📱 Live phone previewPick a phone or tablet size, rotate it, and see console logs and errors as you type.
🔑 Your own keyGenerate a permanent signing key in the browser and download it with its password and fingerprints.
🤖 APK + AABWeb apps become a real signed APK (testing) and AAB (Google Play) instantly in your browser. Import a website ZIP or write your own files.
🅺 Kotlin + GradleStart a native Kotlin project, run Gradle sync and build with your own libraries on a free cloud machine; files are signed in your browser.
🔒 PrivateNo account. Your code and keys never leave your device.
⚡ 3 startersHello app, To-do list and a Tap game to start from.

Android App Builder: frequently asked questions

Is this a real Android Studio?

It is a lightweight in-browser editor that creates a standard Android Studio / Gradle project. You write the app as web files (HTML, CSS, JavaScript, images) that run full-screen in a native WebView, and you can edit the Java, manifest and Gradle files too.

How do I get an APK or AAB?

Download the Android project ZIP, upload it to a private GitHub repository and run the included workflow. In a few minutes you can download a debug APK, a signed release APK and a Google Play AAB. You can also open the project in Android Studio and use Build.

Can I create my own signing key?

Yes. The key panel creates a 2048-bit RSA keystore inside your browser, shows the fingerprints, and lets you download the .jks file and a key-info file. The key is stored only on your device.

Where are my files saved?

Only in your browser (IndexedDB). There is no sign-in and nothing is uploaded. Download the ZIP regularly as a backup.

Does the preview support images and multiple files?

Yes. Upload images and sounds, link them from your HTML or CSS, and the phone preview loads them like a real app. The console shows logs and errors.

Is it free?

Yes, completely free with no account.

Why people choose Supreme Pro

Fast results
Fast resultsTools open instantly and finish in seconds.
Private by design
Private by designFiles stay in your browser and are never uploaded.
Works everywhere
Works everywhereUse it on a phone, tablet or computer.
Free forever
Free foreverNo sign-up, no watermark, no hidden fees.

Sign in to use the Android App Builder

This tool builds real Android apps and signed AAB files, so it needs a free account. Every other tool stays open without signing in.

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