Functional Testing and Non-Functional Testing: What Is the Difference?

Among a huge variety of testing options, functional and non-functional procedures are like whales on which the Universe can perform in a breath-taking way. These checks are a must-have for any application not to fail on such a rich software market.
Taking into consideration the rapid modern lifestyle, mobile apps have filled a super valuable niche on the market: the number of available solutions on Google Play as of March 2020 has reached more than 2.870.000 programs. Such range of applications require a well-thought-out functional testing and non-functional testing to become valid participants of the current software industry.
Despite which type of software functional testing a developer will apply firstly (mobile functional testing, QA functional testing, or other services like crowdtesting), the main task is to ensure the final product satisfies the original requirements and contributes to brand loyalty. All the things considered, functional testing services are a must-to-include stage of any software development.
What are the process’s peculiarities and benefits? Scroll down to find out!

Functional and Non-Functional Testing

All the software testing methods can be subdivided into three categories, depending on their purposes — maintenance, functional testing, and non-functional testing. However, the latter two are to be “user-challenged” today.
In plain English, the first notion defines the checking type, the main aim of which is to establish the developed application compliance with the initial performance requirements of a customer. Such an analysis allows testing the preparedness of an information system to solve the necessary tasks under defined conditions.
4testers team provides the research based on personal experience and, project documentation. As a result, we can suggest how the target audience will behave using a particular feature of an app, and therefore our professional testers perform the same actions to check the program’s functionality. Basically, this sort-of manual user testing may be accompanied with crowdsourcing methods. In order to receive a more vivid understanding of what the app’s possible vulnerabilities are, crowd research services come in handy. This way is a kind of precautionary measure: the crowd testing offers a completely new view on a developing application, so some previously “invisible” issues will be caught.

Non-Functional Testing

In turn, the purpose of non-functional testing is to verify that the app’s properties comply with its non-functional requirements. In simple words, this check helps define the system’s readiness for being released. Of course, unpredicted scenarios may influence the program’s efficiency, so non-functional testing is to determine the overall product’s reliability. The mentioned requirements include the following parameters:


How well the program can perform under different conditions and loads (for instance, low internet connection or a great number of current users operating a search engine).


In this perspective, elements of crowd testing may be also applied.


Development technologies must be up-to-date to match the required functionality of your product. Otherwise, there will be problems with product upgrading, safety and performance.


A system has to provide a qualitative multilayer protection to avoid personal data theft or other possible issues to occur.


for instance, the system shouldn’t lag, no matter which platform it is installed on.

The list can be significantly enlarged. A bright example of non-functional checking would be a test to find out how many users can login into the app’s system simultaneously, whereas functional testing can be presented as a login functionality control (for example, whether two-factor authentication is present).
Both QA procedures are to be taken. However, it is worth mentioning though that non-functional assessment can’t be performed without functional tests and always follows functional testing.
Our company is capable of providing manual assessment and careful analysis to recommend improvements for sites of either B2B or B2C firms.

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Functional Testing Mobile Application

Such a control form is conducted to validate that all the application’s elements perform as expected. It doesn’t matter for which sector the solution is dedicated — either a B2B company or a B2C agency, — mobile functional testing allows saving funds and resources by finding issues during early-development stages. Since there are several parameters defining mobile program’s work, it is necessary to specify which features are to be present and thus, checked. Any remote adjustment element should perform excellently. The interface orientation is to be altered automatically with the device’s moves.

Even if an app is in a background mode, it should use less energy resources. The list of possible examples is totally endless. And we can cope with all of them!

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