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Quality assurance vs. quality control

Quality Assurance vs. Quality Control in App Dev (Explained)

In mobile app development, the distinction between “Quality assurance vs. quality control” is more than just technical jargon—it’s the backbone of a successful app. Quality assurance (QA) ensures that the app is built right from the start, emphasizing process correctness, while quality control (QC) verifies the final product, catching any slips or bugs. Together, they deliver apps that users can trust, ensuring smooth functionality and user satisfaction. Without these checks, an app risks poor performance, unexpected crashes, and disappointed users—a scenario no developer wants.

What Is Quality Assurance Testing?

Quality assurance testing, often abbreviated as QA testing, is a systematic process that ensures a software product meets specified requirements and delivers a seamless user experience. Its primary purpose is to identify defects and discrepancies at the earliest stages of development, ensuring the software’s reliability and performance.

Quality Assurance in Software Testing

Quality assurance in software testing is about more than just finding bugs. QA testing services aim to validate a software application’s functionalities, integrations, and overall behavior. By integrating quality assurance methods, developers can ensure that every code contributes positively to the final product’s integrity and efficiency.

Quality Assurance Process

Quality Assurance Process

  1. Requirement Understanding: It’s pivotal to ensure that app specifications are detailed, considering factors like varying screen sizes, OS versions, and device specifications.
  2. Development of QA Strategy: Once these are defined, a QA strategy for mobile is developed, outlining the test methodologies tailored for mobile interfaces, touch controls, and hardware integrations.
  3. Ongoing Review During Development: As the app is being developed, ongoing reviews are conducted to ensure adherence to mobile standards and quality benchmarks.
  4. Simulator Testing: After development, the app undergoes rigorous testing on multiple devices, simulators, and real-world conditions to ensure flawless functionality.
  5. Performance Testing: Ensure optimal load times and smooth transitions between app screens. Also, check resource usage to ensure the app doesn’t drain the battery or use excessive data.
  6. Feedback and iteration: Collect feedback from beta testers or a control group. Then, iterate on the feedback to refine the app before the final release.

What is Quality Control?

Quality Control Process

Quality Control (QC) refers to the procedures used to ensure the quality of a product, specifically by identifying defects in the finished mobile apps. While Quality Assurance (QA) focuses on the process and preventing blemishes, Quality Control zeroes in on the final product, aiming to identify and rectify any issues before the app’s release.
The role of quality control in mobile app development is paramount. With thousands of apps being released daily, ensuring that one’s app is bug-free and performs optimally is the key to standing out and gaining user trust. Quality Control ensures that the app meets the developer’s specifications and provides a seamless and enjoyable experience for the user.

Quality Control Process

  1. Test Case Execution: After the app’s development, specific test cases, designed based on the app’s requirements, are executed to identify any discrepancies or bugs.
  2. Usability Testing: The app is tested from a user’s perspective to ensure intuitive navigation and user-friendly design, which is crucial for mobile apps given the limited screen real estate.
  3. Cross-device and Platform Testing: The app is verified across a range of devices, screen sizes, and operating systems to ensure consistent performance and appearance.
  4. Performance and Stress Testing: The app’s load time, responsiveness, and behavior under stress (like high user traffic) are tested.
  5. Security Testing: Particularly essential for apps dealing with user data, ensuring that the app has no vulnerabilities that might be exploited.
  6. Feedback Incorporation: Based on QC findings, necessary changes are implemented, and the app undergoes testing again to validate the corrections.

Quality Assurance Methods For Mobile App Development

Static Testing

Reviewing the app’s design, requirement documents, and source code without executing the program. This helps in early detection of inconsistencies or ambiguities.

Black Box Testing

Tests are based on software requirements and specifications. The actual program code is not considered, making it an effective way to validate functional requirements.

White Box Testing

Directly test the app’s source code, data flow, control flow, and more. It’s a deep dive into the app’s internal structures.

Incremental Integration Testing

As new functionality is developed, this method tests it in conjunction with the existing features, ensuring compatibility and smooth integrations.

Thread Testing:

This focuses on a specific sequence of processes in a particular thread of functionality, ensuring that lines flow smoothly in the app.

Quality Control Methods For Mobile App Development

Compatibility Testing

Ensures the mobile app operates correctly across various device types, screen sizes, resolutions, and operating systems.

Interface Testing

Validates the navigation and interaction points within the app, ensuring they align with design and usability standards.

Beta Testing

Before the official launch, the app is released to a select group of users to collect real-world feedback and catch any overlooked bugs.

Load Testing

The app is subjected to maximum operational capacity to understand its performance under peak conditions.

Regression Testing

When updates or patches are released, this method ensures that new code changes don’t adversely affect the existing functionalities.

Monkey Testing

It is a randomized testing process where the app is exposed to random inputs to check for unexpected crashes or behavior.
All these methods, either quality control or quality assurance, ensure that the mobile app works efficiently or offers an interactive and seamless user interface.

Quality Assurance Vs. Quality Control


Quality Assurance 

Quality Control 


Process-oriented. It ensures the processes used in development are adequate.  

Product-oriented. It ensures the final product is defect-free and meets standards

Goal  Prevent defects by ensuring it is developed correctly. 

Identify and correct flaws in the finished product.

Nature  Proactive.  Reactive 
Scope  Covers the entire development process from requirement analysis to delivery. 

is Mostly restricted to testing and evaluation phases after development. 

Responsibility  Typically involves the entire team, especially project managers and analysts.  Often rests with dedicated testers or a quality control team.
Tools  Black box testing, white box testing, static testing.         Regression testing, load testing, beta testing, interface testing.
Output  Recommendations for process improvements, risk analysis, and documentation. Identified bugs and defects, feedback for development corrections.
Documentation Process documentation, methodologies, standards. 

Test cases, bug reports, inspection reports.

Does Quality Assurance Remove the Need for Quality Control?

Quality Assurance (QA) and Quality Control (QC) may appear overlapping, but they serve distinct functions in the mobile app development cycle.
While QA is a proactive approach, focusing on implementing processes to prevent defects during development, QC is a reactive measure, pinpointing and rectifying issues in the final product. Essentially, QA ensures you’re doing the right things the right way, whereas QC ensures the final result is as intended. Both are indispensable; QA provides a solid foundation, but without QC, the potential for unnoticed defects increases, risking user satisfaction.
Therefore, to achieve a holistic, high-quality mobile app, the synergy of both QA and QC is paramount.

Quality Assurance Examples


The globally renowned messaging app is known for its rigorous QA processes. Before introducing its voice calling feature, WhatsApp conducted extensive testing to ensure the functionality was bug-free and efficient, even in low-bandwidth scenarios.


The ride-hailing giant relies heavily on QA testing to ensure its app functions flawlessly across millions of devices worldwide. For instance, when launching in new regions with different map data, Uber’s testing processes ensure that the app still provides accurate locations and ETA predictions.

Quality Control Examples

Pokemon Go

Niantic’s augmented reality game requires meticulous quality control to ensure that in-game elements properly align with real-world locations. After initial launch hiccups with server crashes and geo-location inaccuracies, rigorous QC measures were undertaken to refine and stabilize the gameplay experience.

Mobile Banking Apps

Financial institutions like Chase or Bank of America emphasize meticulous quality control for their apps. Ensuring that transactions are accurately processed and user data remains secure is paramount. Every update or new feature rollout goes through a rigorous QC process, given the sensitive nature of the data they handle.

Benefits of QA QC

  • Error Reduction: Early detection and rectification reduce the number of issues in the final product.
  • Enhanced User Experience: A thoroughly tested app ensures seamless functionality and usability.
  • Streamlined Development: Established processes from QA make development more predictable and efficient.
  • Learning and Improvement: Continuous feedback from QC allows developers to hone their skills and avoid repetitive mistakes.
  • Brand Reputation: Delivering a bug-free app boosts user trust and brand credibility, leading to better market positioning and increased ROI.


Quality Assurance and Quality Control aren’t just fancy terms; they’re the backbone of creating successful, user-friendly apps. While QA ensures the right processes are in place from the get-go, QC acts as our safety net, catching and fixing potential issues before they reach the user. By examining real-world examples, we’ve seen firsthand how crucial these twin pillars are. So, whether diving into app development or simply using an app, remember the silent sentinels—QA and QC—working behind the scenes to enhance your digital experience.


Picture of Bashir Ahmad

Bashir Ahmad

When not savoring tortillas, Bashir captivates readers with helpful and engaging prose, driven by his passion for Flutter and a dedication to providing value.

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