Appium
Appium runs as a server that sits between a test script and the device it's controlling. A script sends it a standard WebDriver command, tap this element, type this text, and Appium translates that command into whatever native automation framework the platform actually provides underneath, XCUITest on iOS, UiAutomator2 on Android. Because it works this way, a team never has to build a testing SDK into the app itself, Appium automates the app exactly as it already exists.
That single protocol covers more ground than it might first suggest. Appium can drive native apps built specifically for iOS or Android, hybrid apps that wrap native screens around embedded web content, and mobile web through a device's own browser, all through the same commands. Client libraries exist across the same range of languages Selenium supports, since both are speaking the same underlying protocol.
That shared foundation is a large part of why teams already using Selenium for web testing tend to pick up Appium quickly. Structural patterns like the page object model carry over directly, and a lot of the same test design habits apply, even though the platform underneath has changed from a browser to a device.
How it works
- Runs as a server that receives WebDriver commands and translates them into the platform's own native automation framework.
- Drives Apple's XCUITest under the hood on iOS, and UiAutomator2 on Android.
- Requires no code changes or extra SDK inside the app being tested.
- Supports native apps, hybrid apps, and mobile web through the same protocol.
- Offers client libraries in the same range of languages as Selenium, since both speak WebDriver.
Where it shows up
- Automating a login and checkout flow across both the iOS and Android versions of an app from a shared test structure.
- Testing a hybrid app that mixes native screens with embedded web content.
- Running mobile regression suites in CI/CD alongside a web suite that already uses Selenium.
- Reusing patterns like the page object model that a team already applies to its web tests.
Benefits and challenges
| Benefit | Challenge |
|---|---|
| One protocol covers iOS, Android, and some desktop platforms, instead of a separate tool per platform. | Setup is heavier than a web-only Selenium suite, drivers, emulators or real devices, and platform SDKs all need configuring. |
| Doesn't require any code changes inside the app under test, unlike some platform-specific frameworks. | Mobile tests are generally slower and flakier than web tests, app installs, permissions, and device state all add variability. |
| Teams already using Selenium can reuse the same WebDriver-based patterns and, in several languages, similar code. | Still depends on real devices or a device farm for full coverage, since emulators don't catch every real hardware quirk. |
Frequently asked questions
Is Appium the same as Selenium?
No, but they're closely related. Both speak the WebDriver protocol, Selenium drives web browsers and Appium drives native, hybrid, and mobile web apps, translating those same kinds of commands into whatever automation framework the mobile platform actually provides underneath.
Does Appium require changes to the app being tested?
No. It automates the app as it already exists, without requiring a testing SDK to be built into it, which is part of why it can test a production build rather than a special test-only version of the app.
Can Appium test both native and hybrid apps?
Yes. It supports native apps built specifically for iOS or Android, hybrid apps that combine native screens with embedded web content, and mobile web through a device's browser, all through the same underlying protocol.
How Klarent helps
Klarent's AI agents cover mobile app testing alongside web, desktop, and API surfaces from the same plain-language description of a flow, with self-healing execution handling the kind of layout and element changes that typically break a scripted Appium suite.