Flutter run on multiple devices in one window

Flutter promises one codebase for iPhone and Android. Checking that promise is another story. To get a Flutter run on multiple devices, you usually start each simulator by hand, keep several terminal tabs open, and then squint at windows scattered across your screen to compare a single button. Final Code puts it all in one place.

Open your Flutter project and Final Code recognises it straight away. Pick the iOS Simulator, an Android Emulator and any phone on the cable, press Run, and the app appears on each of them, mirrored live in the same window. You can click, swipe, type and rotate every device without leaving it.

Flutter iOS Simulator and Android Emulator in one window

Flutter's renderer draws every pixel itself, so the two platforms look very similar. "Very similar" is not the same as identical, though. Fonts fall back differently. The status bar and the gesture area at the bottom of the screen are not the same height. The back gesture works differently on Android. Text that fits on a Pixel wraps on an iPhone SE shape. You only catch these things when you check both platforms one right after the other.

The iOS Simulator and the Android Emulator live in one window, one click apart. Save a Dart file and every open simulator and emulator updates at once, so the result is waiting on both platforms when you switch. If you want to focus, show one device at a time, or pop a device out into its own window on a second screen.

How it works

Test a Flutter app on iPhone, the real one

Simulators are fine for layout. They are not fine for camera access, push permission prompts, the feel of scrolling at 120 frames per second, or how hot the phone gets during a long session. For that you need to test the Flutter app on an iPhone in your hand.

Connect your iPhone by cable, unlock it and tap Trust. Final Code signs the app automatically using your App Store Connect API key or the account already in Xcode. It builds a release version with your code inside and installs it, in seconds to minutes. There is no upload, no processing wait, and no need to open Xcode at all for the everyday loop.

Android phones connect by cable with USB debugging, or over Wi-Fi with a pairing code. Once a build is on one phone, it is in your build history with its commit and size, ready to install on another device in one click.

The Flutter problems you will actually meet

Every Flutter developer hits a familiar set of walls. Here is how Final Code helps with each one.

CocoaPods, Java and SDK versions

A lot of failed Flutter builds have nothing to do with your Dart code. CocoaPods is missing or outdated, the Java version does not suit the Android build, or an SDK component was never installed. Final Code's Project check looks for missing tools when the project opens, and the Tools screen installs or fixes them in one click.

A plugin that works on Android but not on iOS

Add a plugin with native code and forget to rebuild, and you get an error that the plugin's method has no implementation. Final Code rebuilds the native side when libraries change, so the plugin code actually ends up in the app.

Overflow warnings and layout errors

The famous yellow and black stripes show up on one screen size but not another. With several devices running, you see the overflow as soon as you switch to the small one, and the error message is in the log with the device it happened on.

Bugs that only exist in release mode

Assertions are turned off in release, code is compiled ahead of time, and timing changes. A race condition that never shows in debug can freeze a release build. Because real phones get release builds, you find these before your users do, and the crash or error lands in the Issues box.

Each launch on a real phone gets its own session log: the app's console output, the phone's native output, every build and install step, and crash reports with readable names. When you need a second opinion, the Share problem report bundles what happened, the file and line, what changed since the app last worked, and the device and Mac, with passwords, keys and tokens removed.

For Flutter beginners

If you just installed Flutter and ran your first counter app, the tooling can feel like a lot. Doctor output, Android licences, Xcode command line tools, a phone that does not appear. Final Code is made for this moment. When something is missing, Final Code opens Settings → Tools and installs it in one click each: Xcode components, simulators, the Android SDK, Java, CocoaPods and Node.

No terminal is needed for any of it. When something breaks, the Issues box explains it in plain words, and "Explain this problem" asks Claude to walk you through the cause and the fix. For a gentle start, see our guide to testing on iPhone and Android.

For Flutter teams and studios

Studios that build Flutter apps for clients often run several projects at once, each on its own branch. Open any GitHub repository and any branch in one click; Final Code picks the newest branch with app code by default. It checks GitHub every minute, pulls new commits and reloads every open device, so the test phones on your desk always run the latest work. Local edits are protected and never lost.

Share an Android build with anyone on the same Wi-Fi using a link and a QR code: great for a quick client demo. Use the build history to compare yesterday's release with today's. A membership covers up to three Macs, and every project type is included, so the same seat also handles your React Native or native iOS work. Details are on the pricing page.

Flutter apps written with AI

AI coding assistants write a lot of Dart these days. Claude, ChatGPT, Cursor, GitHub Copilot, Gemini and Windsurf can produce a full screen of widgets in seconds. What they cannot do on their own is look at the result on a phone. Final Code gives them eyes.

It keeps a .finalcode folder in your project, never committed, with live status, logs, issues, screenshots and the build log. An AI assistant can read that folder and ask Final Code to build, run, reload, tap, swipe, type and take screenshots, then read the phone log to see if the change worked. If the assistant pushes to GitHub, Final Code notices the new commit and rebuilds. More on this on our page for AI app builders.

Final Code next to the Flutter command line, Xcode and Android Studio

The Flutter tool is excellent, free and official. It can already target several devices at once, and its hot reload is one of the best in the business. Android Studio and VS Code have strong Flutter plugins for editing and debugging. Final Code does not replace your editor. It adds the parts the command line leaves to you: devices mirrored in one window, release builds on real phones in one click, a device inspector, grouped issues, session logs, build history and GitHub sync. Compare in detail with Android Studio, the Xcode Simulator or TestFlight, or see every comparison.

Product names are trademarks of their owners. Comparison based on publicly available information as of October 2026.

Final Code is a fast, modern, native Mac app for macOS 13 or later, on Apple silicon and Intel. Your code stays on your Mac. See all features, or read about testing web apps in phone shapes if you also ship Flutter for web.