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Automation Testing vs. Manual Testing: What’s the Difference?

At Amatis Software Engineering, we do both automation tests and manual tests, and in this blog, I wanted to explain the differences between these tests.

Manual testing is testing of the software where tests are executed manually by Test Engineers or QA Analysts. It is performed to find bugs in software under development.

 Automated software testing, testers write code or test scripts to automate test execution. Testers use suitable automation tools to develop the test scripts and validate the software. The aim is to complete test execution in a less amount of time.

If we need to determine which one is better, there is no correct answer. Both types of testing - manual or automated are suitable in different cases depending on multiple factors like budget, project requirements, resources, timeline, suitability, expertise and project structure.

Information below shows the main differences between manual testing and automated testing according to some significant factors like time, cost, accuracy, knowledge, frameworks, etc.

As seen in below both manual and automated testing have advantages and disadvantages. Manual testing for instance, we can achieve more accurate feedback based on human experience. It also does not require codding knowledge. Automated testing on another hand helps finding more bugs by speedy and efficient process, which can be recorded.


· Manual testing is a time consuming since it is based on human resources only.

· Automated testing allows you to execute the test much faster than the manual approach.


· In manual testing the risk of human errors in this case is higher.

· Automated testing is processed by scripts and tools which makes it reliable and accurate but in the same time the script can only act as it is set - it can miss errors that are obvious to the Manual tester.

Test reports

· Manual approach gives the opportunity for human observation and evaluation of user friendliness. Specialized programs or sites to support tests and record bugs are used (Testrail, Jira etc.)

· Human consideration is not involved which could lead to lack of user-friendliness and experience evaluation. The execution results are saved and easily excessed in the automation system.


· The initial investment in manual testing is lower compared to the automation but ROI is also lower in a long perspective. The investment in more human resources is required.

· The automated testing usually requires higher initial investment but the ROI is better in the long perspective. In this case, the investment is required for the development of testing tools, which mean – hiring an automation engineer.


· No need for programming skills is necessary in manual Test engineers or QA.

· Programming languages knowledge is required for the creation of scripts using most of tools.


· In manual QA frameworks are not used but it could rely on checklists, guidelines and processes during the tests.

· Automation testing uses frameworks like Selenide, Serenity, Data Driven, Hybrid, BDD, etc.

When to use

· Manual Testing
Exploratory Testing - when the tester’s experience and intuition is required.

             Usability Testing: when the test measures how user-friendly and convenient the particular software is.

             Ad-hoc Testing: No scenario, unplanned type of testing which is supposed to be done by human because the understanding is an important factor.

· Automation Testing

Performance Testing: Testing, which requires the simulation of huge number of concurrent users is better to be done by automation.

             Load Testing: Automated testing is also suitable when we need to evaluate the load efficiency, which is part of the performance testing.

             Functional Testing: In this case the automated testing is more appropriate because it allows frequent code changes in high speed.

             Repeated Execution: When test is based on repeated execution of the task, QA automation is preferable.


You can check the more detailed information about the manual testing and automation testing on these sites.