Introduction
Mobile testing is crucial for ensuring apps perform well across different devices and environments, but it can be a bit of a challenge. With so many devices to consider, performing tests on each one individually would be a costly and time-consuming process. Thankfully, mobile testing can be made easier with the use of emulators and simulators; tools that let you test apps quickly without needing every physical device.
These tools are great for when you need fast results, but it’s important to understand when and how to use them effectively. In this article, we’ll dive into the world of mobile testing through simulators and emulators, explaining the differences between them, their features, and whether they can truly replace physical devices in the testing process.
What is a Simulator?
A mobile simulator mimics the software environment of a real mobile device but doesn’t emulate the underlying hardware. In mobile testing, simulators are often used to test the behavior of apps in environments that can be controlled through software alone. They are great for testing things like the user interface, screen layout, and simple interactions that don’t rely on specific hardware features.
For example, if you’re testing how an app behaves when sending a message to another app or interacting with an external system, a simulator will be more than enough. Simulators are often used for mobile testing when you’re focused on software behavior and don’t need to worry about the device’s physical properties.
What is an Emulator?
On the other hand, mobile emulators replicate both the hardware and software components of a real mobile device. This means that when you’re using an emulator for mobile testing, you’re getting a closer approximation to the actual user experience. Emulators let you test features that touch the hardware, such as GPS with a mocked location or a basic camera flow, without a physical phone. Camera quality and performance still need a real device.
For example, if your app is meant to interact with device-specific hardware like sensors or needs to be tested with different operating system versions or firmware, an emulator is the go-to tool. It simulates the actual device, providing a more accurate reflection of how the app will behave in a real-world environment.
Simulators Vs. Emulators
| Aspects | Simulator | Emulator |
| Operating System | Primarily used for iOS devices | Used mainly for Android devices |
| Problem-solving | Features that are related to software | Available for both software and hardware features |
| Performance | Fast solutions as it only mimics software | Slower approach due to emulating actual hardware |
| Provided by | Device manufacturers and external companies | Device manufacturers |
| Reliability | It does not simulate all sorts of user interactions | Despite more features, it still does not emulate all types of user interactions |
A note for 2026. The line between the two has blurred. Apple’s iOS Simulator runs your app on a Mac and can fake a location; Android’s Emulator runs a full system image and can mock location, sensors and a virtual camera. Neither reproduces real battery drain, heat throttling, real carrier networks or camera quality, so plan real-device runs before every release.
Mobile testing: When should we use a simulator/emulator?
Now that we’ve covered the basics of mobile testing with simulators and emulators, let’s talk about when to use each.
If you’re testing an app that primarily focuses on software, such as the user interface or app flow, a simulator is your best bet. It’s cost-effective and faster, and it can be used for early-stage testing before diving into more complex checks.
However, if your app interacts with hardware-specific features like GPS, camera, or microphone, you’ll need an emulator. This is especially important for testing how the app behaves with different hardware versions or firmware updates. For instance, if you need to test an app that works with different screen resolutions or requires specific Android or iOS versions, emulators will give you a more accurate picture.
But, There’s a Catch:
While simulators and emulators are great for initial testing, they can’t fully replace real devices. Real-world testing is still necessary to catch issues that can’t be replicated in a virtual environment. For example, mobile testing on actual devices is essential for identifying performance issues like lag, and ensuring that apps work across the wide variety of screen sizes and hardware configurations in the real world. That is why our mobile app testing runs on real phones and tablets through BrowserStack as well as in emulators.
A virtual environment can’t capture all the nuances that come with real user behavior. If you’re testing an app like a camera app, for instance, the quality of photos taken on a physical device might vary depending on the specifications of the phone’s camera; something a simulator or emulator can’t mimic accurately.
Conclusion
To sum up, mobile testing with simulators and emulators can be incredibly helpful for getting quick feedback and performing early-stage tests on your app. They provide a fast, cost-effective way to identify basic issues in software behavior before moving on to more in-depth testing.
However, when it comes to testing real user experiences, especially for hardware-specific functionalities, nothing beats testing on actual devices. By using simulators and emulators early in the process, and then following up with real-world testing, you can ensure a more thorough, well-rounded testing process for your mobile app.
How BetterQA handles this
How BetterQA tests mobile apps
We use emulators and simulators for fast checks during a sprint, then run the release candidate on real devices through BrowserStack, on the phones and OS versions your users actually have.
Every bug goes into BugBoard with the device, the OS version and the steps to reproduce it, so a developer can see it fail without guessing.
See our mobile app testing service →
Talk to our QA teamTell us what you are testing. We reply within one business day.
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