Published on February 18th, 2025
Today, mobile phones have become an important part of our lives. It is where Mobile App UI Testers come into role. UI tester evaluates the design and responsiveness to evaluate the overall performance of the app. They help testers to enhance user experience (UX), accessibility, and functionality by identifying and fixing UI-related issues before launching an app. UI testers use various testing such as Selenium and UI Automator to perform these tasks effectively. They follow structured testing processes to ensure a high-quality and error-free mobile application is developed. In this blog, we will share insight on the role of a Mobile App UI Tester and essential tools used.
Role of a Mobile App UI Tester
It is the responsibility of a mobile app UI tester to ensure an app is easy to use and visually appealing. The UI testers work closely with developers and designers to test different screens. They make sure buttons and interactions are working fine before an app is released. By catching errors early, they help improve user experience and prevent negative feedback from real users. Their role is essential in creating apps that people enjoy using without frustration.
What does a Mobile App UI Tester do?
A mobile app UI tester plays a key role in making sure an app is smooth and user-friendly. Their job is to check if buttons, menus, and other features work correctly. They also look for design issues that may confuse users. By testing different screens and interactions, they ensure the app is easy to navigate and free from problems. Without UI testers, apps may have glitches that frustrate users and lead to negative reviews.
| Task | What it Means | Why It Matters |
| Checks Design Consistency | Ensures the app looks the same on all screen sizes | Prevents text or buttons from being cut off |
| Tests Responsiveness | Checks if buttons and menus respond correctly | Avoids frustration when tapping or swiping |
| Finds Navigation Problems | Makes sure users can move easily between screens | Prevents users from getting lost in the app |
| Verifies Performance | Tests how fast the app loads and runs | Avoids slow loading times and crashes |
| Detects Usability Issues | Looks for confusing layouts or missing features | Helps users find what they need quickly |
| Ensures Accessibility | Checks if the app works for people with disabilities | Makes the app usable for everyone |
Also Read: Software Testing Guide: How to Test a Website?
Common UI Issues Found in Mobile Apps
Imagine tapping a button on your phone, but it’s too tiny to press properly. Or trying to read something important, but the words are so light and small that they strain your eyes. These small issues might seem like nothing at first, but they can turn a simple app or website into a frustrating experience. Users expect smooth, easy navigation, but when buttons don’t respond, text is unreadable, or pages take forever to load, they leave—often never returning. This is why UI (User Interface) testing is crucial. Skilled testers step in to spot these problems before users do.
| UI Issue | Impact on Users | How UI Testers Fix It |
| Buttons too small | Users can’t tap properly | Increase button size and spacing |
| Text too light or small | Hard to read content | Use darker fonts and larger sizes |
| Slow response time | Frustrates users | Optimize app speed and animations |
| Overlapping UI elements | Looks messy, hard to use | Adjust spacing and layouts |
| Broken links or buttons | Features don’t work | Debug and fix coding errors |
Top Tools Used by a Mobile App UI Tester
Imagine using a mobile app where buttons don’t work, text is hard to read, or pages take too long to load. Annoying, right? These small problems can make users quit an app and never return. Or imagine a banking app where the numbers are too light to read—this can lead to mistakes in transactions. These real-world issues can cause users to delete the app, leading to bad reviews and fewer downloads.
To prevent this, UI testers use tools that detect problems and suggest fixes. Some tools check for slow loading times, while others ensure text and buttons are easy to see and tap. Some even simulate real-user behavior to catch hidden bugs. By using these tools, testers make sure apps are easy to use, visually clear, and free of frustrating errors.
1. Manual UI Testing Tools
Have you ever used an app that looked perfect on one phone but had glitches on another? Maybe a button was missing, or the layout looked messy. This happens because different devices, screen sizes, and operating systems can change how an app appears and functions. That’s why UI testers don’t just rely on automated tests—they also test apps manually, just like a real user would.
Manual UI testing tools help testers interact with an app to find issues that automation might miss. Imagine a shopping app where the checkout button works fine on one phone but doesn’t respond on another. A tester using manual tools can catch this problem and fix it before users face frustration. Some tools let testers check an app on different devices without physically owning them. Others provide testing environments specifically for Android or iOS apps.
| Tool | Purpose | Best For |
| BrowserStack | Allows testing on multiple devices without owning them | Cross-device testing |
| Android Studio | Helps test UI elements on Android apps | Android developers |
| Xcode | Provides a testing environment for iOS apps | iOS developers |
2. Automated UI Testing Tools
Imagine testing an app manually every time a new feature is added. It would take hours—maybe even days—to check every screen, button, and function. This is why automated UI testing tools are a game changer. Instead of manually testing each feature on every device, automated tools do it in minutes.
| Tool | Purpose | Best For |
| Appium | Tests both iOS and Android apps | Cross-platform testing |
| Espresso | Google’s tool for Android UI testing | Android apps |
| XCUITest | Apple’s UI testing framework | iOS apps |
| Selenium | Tests UI elements on web-based mobile apps | Mobile web apps |
3. Cloud-Based UI Testing Platforms
Buying every device for testing would be expensive and difficult. This is where cloud-based UI testing platforms help.
For example, think of a banking app. If a button works fine on an iPhone but not on a budget Android phone, users will get frustrated and may stop using the app. Cloud-based platforms help testers catch such issues early by running tests on different devices remotely. Google’s Firebase Test Lab is especially useful for testing Android apps across multiple phone models.
In this section, we’ll look at the best cloud-based UI testing platforms, their features, and how they help developers deliver bug-free, user-friendly apps—without the hassle of owning dozens of devices.
| Platform | Features |
| Sauce Labs | Runs tests on real devices in the cloud |
| LambdaTest | Provides automated UI testing on various devices |
| Firebase Test Lab | Google’s tool for testing apps across multiple Android devices |
Also Check: An Overview of Server Testing
Processes Followed by a Mobile App UI Tester
Step 1: Define UI Test Scenarios
Before testing, a UI tester lists all the things that need to be checked. This includes:
- Buttons, menus, and forms
- Navigation and screen transitions
- Text readability
- App behavior in different modes (light/dark mode, offline mode)
Step 2: Execute UI Tests
Testers run different types of tests:
| Test Type | Purpose |
| Functional Testing | Checks if buttons, forms, and links work properly |
| Usability Testing | Tests if users can easily navigate the app |
| Performance Testing | Measures app speed and stability |
| Compatibility Testing | Ensures the app works on different devices and OS versions |
Step 3: Report and Fix Bugs
Once issues are found, they are logged into tracking tools like JIRA or Trello. Developers then fix these problems before launching the next update. After fixing the issues, the developers usually update the status on the jira app as fixed. The UI testers analyze these issues and mark them fixed if they have been resolved.
Why Choose iTechnolabs to Hire a Mobile App UI Tester?
iTechnolabs is a leading mobile app development company offering quality assurance services. Our comprehensive software testing services ensure our mobile applications deliver a seamless and user-friendly experience. We have extensive experience in building high-performing apps across various platforms. Our expert team understands the intricacies of mobile UI design and functionality. We offer tailored solutions that align with our business goals. Our dedication to quality and strong client relationships are reflected in the positive feedback from satisfied customers. So, what are you waiting for? Contact iTechnolabs today to hire a Mobile App UI Tester.
Conclusion:
A Mobile App UI Tester is a key player in ensuring that apps are easy to use, visually appealing, and free of errors. They help businesses avoid bad reviews, increase customer satisfaction, and improve overall usability.
By using the right tools and following structured testing processes, UI testers can catch and fix UI issues before they reach real users. Whether it’s WhatsApp, Instagram, Uber, or Zomato, all popular apps invest heavily in UI testing to stay ahead.
If you’re developing a mobile app, never skip UI testing! It can save you from lost revenue and unhappy users.
Would you like to improve your app’s UI? Start testing today!
FAQs
Why is UI testing important for mobile apps?
UI testing makes sure an app looks good and works well. If an app has broken buttons or slow screens, users will uninstall it. Testing prevents these problems and keeps users happy.
How does UI testing help businesses?
Businesses lose customers if their apps don’t work properly. UI testing finds issues before users do, preventing negative reviews and lost sales.
What happens if an app skips UI testing?
If an app isn’t tested, users might face problems like unresponsive buttons or unreadable text. This can lead to bad reviews and fewer downloads.
What tools do UI testers use?
Testers use tools like Appium, Selenium, and BrowserStack to check apps on different devices and fix problems quickly.
Can UI testing be automated?
Yes! Automation tools like Appium and Espresso help testers check apps faster and find bugs before launch.
