Best Emulators for Mobile App Load Testing

With load testing, you can get a close-to-reality picture of how your mobile application will work in a real-life environment, how particular elements of the code will react to a significant number of tasks, and with what speed its algorithms will work. However, the same code can be executed on various devices with different results.

That is why experienced developers always seek to optimize performance of their products on different types of gadgets. It is energy-consuming and quite expensive: even in Apple’s relatively short product line, there are dozens of devices, forget all smartphones and tablets on Android.

Emulators can help, though. They are software that simulates real gadgets. An emulator can show how an app will run on different types of smartphones and under different OS releases. Of course, emulators are not only used for testing — many of them were created for gamers to be able to run mobile games on a desktop. We have selected the emulators that are best suited for load testing.

Emulators or Simulators?

Prior to making a list, we should start with definitions. The thing is, many people confuse emulators with simulators. Both simulate the mobile device, but the simulator only reproduces the software environment in which your app will function, while the emulator tries to accurately recreate both system hardware and software.

With a simulator, you can watch an approximation of how your application will interact with other software — e.g., share data or use third-party accounts. With an emulator, you will see your application interacting with hardware and OS core, using memory and CPU resources. We have already posted a detailed article on the differences between an emulator and a simulator. Obviously, only emulators are suitable for load testing, because our goal is to understand how the application will work on specific devices.

Best Emulators for Load Testing

Since iOS and Android devices are from two completely different universes, there are not many emulators on the market that imitate both. Also, iPhone emulators are in general less common, as the OS is more reserved. Our review includes four emulators of Android, one system that allows you to test both types of gadgets, and two platforms that imitate Apple products. It’s not a competition, but a list of recommendations. Emulators are arranged by OS and in alphabetic order.

Android

Android Studio

Android Studio is a development environment designed to create applications. Among many other features, it includes a device emulator that can be used for load testing. Android Studio was developed by the creators of Android OS and is available for free. The function that you will need is called Android Virtual Device: with its multiple settings, you can create virtual gadgets of almost any configuration.

Genymotion

Genymotion is a popular system capable of emulating Android-based devices with a wide range of additional options: camera, spin sensor, GPS, battery, etc. The emulator is testing-oriented and compatible with many profile frameworks, such as Appium and Espresso. Genymotion is rather quick because it does not use nested virtualization (i.e., one virtual machine running inside another). The system has good scalability and allows running of several devices for segmented or parallel testing.

LambdaTest

LambdaTest is a cloud platform that lets you test your app online by uploading its APK to the cloud. You can also test software hosted on developers’ local resources after giving the service an opportunity to connect to them. Users can select a target gadget from several thousands of virtual devices grouped by manufacturers. LambdaTest can take into account a device location by emulating regional features of gadgets in more than 25 countries.

NoxPlayer

NoxPlayer is a free Android-based device emulator known primarily among gamers. However, it can be used to perform load testing because it allows you to run the target application and transfer data to it. The system has configurable settings of a virtual device (CPU, RAM, Wi-Fi), but, unfortunately, the list of pre-installed smartphones is not as large as with other developers-oriented emulators.

iOS

Xcode

An integrated development environment released by Apple provides a complete set of tools for creating iOS applications. The emulator responsible for running and testing software simulates the operation of real gadgets very accurately, as it is supplied by the manufacturer. The system supports some user interactions, such as scrolling or rotating the screen. Xcode is absolutely free: to use it, you only need your Apple ID.

Universal Emulators

Corellium

Corellium is an online service that can emulate both Android-based and Apple devices. Its price starts at $99 and depends on the number of virtual cores and available functions. You can choose from a large list of pre-installed devices using the combination of physical characteristics of your hardware and system software. Unlike emulators supplied by OS developers, Corellium can emulate non-standard modes of device use – for example, connecting to an unlocked iPhone via USB or VPN.

Smartface

Smartface is a development environment that allows you to create applications for iOS and Android on your desktop for Windows, macOS, and Linux. Since one of the elements of such a system is an app, it can be used as an emulator for load testing. Smartface has a very simple, interactive interface. Unlike many other emulators and simulators, the system does not use Xcode or Android Studio engine. 

To Sum Up

Each developer expects performance testing to answer their own questions, and each developer chooses the most suitable tools for this purpose by themself. We hope this post can be a reference point that will help you find out more about the system you like. You should also pay attention to reviews on specialized resources and forums. And of course, feel free to contact PFLB — we work with every emulator listed in this article. If you have any questions or tasks, we are here for you — with professional assistance in testing and all the necessary tools for it.