BuiltWith: App & SDK Inspector

BuiltWith – Discover What's Behind Every Android App

Ever wonder what's really running under the hood of every app on your device?

BuiltWith gives developers, security researchers, and power users instant insight into the technology stack behind every installed Android app. Find out whether an app is built with Flutter, React Native, Unity, Kotlin, or many other frameworks—while also auditing its permissions.

Everything happens entirely on your device. No cloud lookups. No data collection. No compromises.

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### Identify Any App's Tech Stack

BuiltWith performs deep, on-device APK fingerprinting to identify the frameworks powering your installed apps by analyzing shared libraries, asset bundles, and META-INF signatures.

Supported frameworks include:

• Flutter
• React Native
• Unity
• Unreal Engine
• Xamarin
• .NET MAUI
• Kotlin Multiplatform
• Capacitor
• Cordova
• Ionic
• Cocos2d
• NativeScript
• Titanium
• Native Java & Kotlin apps

Know exactly how an app was built—without guesswork.

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### Permission Pilot

BuiltWith also includes Permission Pilot, a comprehensive permission analyzer that helps you understand what access your installed apps request and whether those permissions have been granted.

Features include:

• Device security overview based on Dangerous and Special Access permissions

• Browse apps by permission groups such as:
• Camera
• Microphone
• Location
• Storage
• Contacts
• Notifications
• And more

• View granted and denied permission status

• Discover which permissions are requested most frequently across your device

• Inspect app metadata including:
• Target SDK version
• Install source (Google Play or sideloaded)
• Shared User IDs

Whether you're auditing your own device or researching third-party apps, Permission Pilot gives you the information you need.

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### How BuiltWith Works

BuiltWith is designed to be transparent, fast, and privacy-first.

• Consent First

Before scanning begins, you'll see a clear disclosure explaining exactly what the app reads and confirming that no information leaves your device.

• Complete App Inventory

Using Android's QUERY_ALL_PACKAGES permission, BuiltWith enumerates installed applications so it can provide complete results.

• APK Fingerprinting

BuiltWith examines only public APK metadata and signature markers to identify frameworks. It does not inspect your personal files or private data.

• Permission Analysis

Android's PackageManager is used to retrieve declared permissions, protection levels, and current grant status.

• Fast Results

Optimized indexing provides near-instant results, even on devices with hundreds of installed applications.

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### Privacy Comes First

BuiltWith is built around one simple principle:

Your device data belongs to you.

• No account required
• No advertisements
• No analytics
• No tracking
• No cloud processing
• No app inventory uploads
• No data collection

Everything stays on your device.

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### Who Is BuiltWith For?

BuiltWith is perfect for:

• Android developers
• Security researchers
• Privacy enthusiasts
• Reverse engineers
• IT professionals
• Curious Android power users

Whether you're benchmarking competitors, auditing device security, or simply curious about the apps you use every day, BuiltWith gives you complete visibility.

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### Download BuiltWith Today

Stop guessing what's installed on your device.

Discover the frameworks powering your apps, audit permissions with confidence, and understand your Android device like never before.

Install BuiltWith today and know what's really running on your phone.

Requires Android 7.0 or later.

Built with Kotlin and Jetpack Compose.

Regularly updated with new framework signatures and improvements.