Test your website on iPhone and Android shapes, tablets and foldables in one window

Most people visit your website on a phone. Most websites are built on a laptop. That gap is where layouts break: a menu that only opens on hover, a hero image that crops off the headline, a sticky footer that covers the Buy button. If you want to test your website on iPhone and Android screens properly, you need to see those screens while you work, not after you deploy.

Final Code is a Mac app that does exactly that. Open your project, and it starts the dev server for you, whatever the framework: React, Next.js, Vite, Vue, Svelte, plain HTML or anything else with a dev server. Built websites work too. Then it shows the site in screen shapes for iPhone, iPad, Android phones and foldables, one click apart, one click apart in one window.

A mobile web preview on Mac that shows every shape

Resizing a browser window is a start, but it does not show you how the page feels inside the shape of a real device. Final Code's screen shapes put your web app in the outline of a phone, a tablet or a foldable, so the proportions are right and you can compare them together. Edit a component, save, and your dev server's live reload brings the change to every shape.

Foldables deserve a special mention. A folding phone can be tall and narrow when closed and nearly square when open. Layouts that assume "phone means narrow" fall apart on the inner screen. Seeing the foldable shape next to a regular phone and a tablet catches that straight away.

How it works

Capacitor app testing, without the native maze

Capacitor and Ionic let you ship a web app as an iPhone and Android app. That is a big win, until the native side needs attention. Suddenly you are in Xcode and Android Studio, dealing with signing, Gradle, CocoaPods and a plugin that behaves differently on each platform. Final Code takes care of running the native shells for you.

Open your Capacitor project and Final Code knows what it is. Run it on the iOS Simulator and an Android Emulator, mirrored live in one window, where you can click, swipe, type and rotate. Plug in an iPhone, or pair an Android phone over Wi-Fi with a code, and it gets a real release build with your code inside. The iPhone build is signed automatically with the account in Xcode or an App Store Connect API key.

On simulators and emulators, the device inspector lets you test the conditions hybrid apps struggle with: offline and 5G networks, light and dark appearance, larger text, landscape and flipped orientation, GPS locations like Dubai or New York, and low battery. Every build that reached a phone is kept in the build history, ready to reinstall in one click.

Mobile web mistakes you will catch

These are the bugs that make a site feel broken on a phone even though it looks fine on a laptop. Seeing every shape is the quickest way to find them.

Full-height sections that are too tall

A hero set to the full viewport height can hide behind the browser's toolbars on a phone, cutting off your call to action. In a phone shape you notice the missing button immediately.

Content under the notch or the home bar

Fixed headers and bottom bars that ignore safe areas collide with the notch, the Dynamic Island or the home indicator. Hybrid apps are especially prone to this.

Hover-only interactions

Dropdowns and tooltips that only open on hover do nothing on a touch screen. Clicking through the site in a phone shape, the way a thumb would, makes these obvious.

Sideways scrolling

One wide image, table or code block can make an entire page scroll sideways on a small screen. Next to a tablet and a foldable shape, the overflow stands out.

Native plugins that fail on one platform

In a Capacitor app, a camera or file plugin may work on Android and fail on iOS, or the reverse. Errors, crashes and failed builds land in the Issues box as one entry each, with the device, the stack and the log lines just before.

For beginners building their first site

You might have built your first website with a tutorial or a template, and it looks great on your laptop. Final Code helps you see it the way your visitors will. There is no terminal to learn: it starts the dev server for you, and if your Mac is missing Node or another tool, it installs it with one click. Plain-word messages with one button each walk you through the rest.

If something breaks, the Issues box explains it in plain words. For a broader introduction to testing on phones, read our guide to testing on iPhone and Android.

For agencies and product teams

Web agencies live in review cycles. A client says "the menu is broken on my phone", and the team spends a morning finding out which phone. With Final Code, every designer and developer can keep iPhone, iPad, Android and foldable shapes open while they work, and capture all of them in a single screenshot for the client. Projects open straight from GitHub on any branch, and Final Code pulls new commits every minute, so a review Mac always shows the latest work.

Product teams with a web app and a native app in one monorepo can switch between them in one click, so the React Native or Expo app and the website get tested on the same desk. When a problem needs a second pair of eyes, Share problem builds one report with the file and line, what changed since it last worked, the device and the Mac, with secrets removed. Send it as a private link that lasts seven days, a GitHub issue or a file. Pricing is on the pricing page.

Web apps built with AI

Web apps are the most common thing people build with AI. Claude, ChatGPT, Cursor, GitHub Copilot, Gemini and Windsurf can scaffold a full Next.js or Vite app in minutes. They usually design for a desktop browser, though, and they cannot see how the result looks on a phone. Final Code helps close that gap.

It writes a .finalcode folder in your project, never committed, with live status, logs, issues, screenshots and the build log. An AI assistant can read it and ask Final Code to run, reload, tap, swipe, type and take screenshots, so it can look at its own work in a phone shape and fix what it sees. If the AI pushes to GitHub, Final Code picks up the change by itself. Learn more on the AI app builders page.

Compared with browser device modes and other tools

Chrome DevTools has a device toolbar and Safari has Responsive Design Mode. Both are free, built in and genuinely useful for quick checks, and you should keep using them for debugging CSS. They show one viewport at a time inside a desktop browser, and they do not run your Capacitor app as a native app. Final Code adds several phone, tablet and foldable shapes, starts your dev server for you, runs hybrid apps on simulators, emulators and real phones, and keeps logs and issues in one place. For native tooling, see Final Code vs the Xcode Simulator and vs Android Studio, or browse all comparisons.

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

Final Code is an easy to use, all-in-one Mac app for macOS 13 or later, on Apple silicon and Intel. Your code never leaves your Mac. See every feature, or check our pages for Flutter and Unity if you build beyond the web.