The Different Types of CAPTCHA Checks for WordPress Websites

Since CAPTCHA was first introduced, it has undergone various iterations and evolutions. At every stage, the goal has always been to make it easier for humans and harder for non-humans to pass the test. Over time, this has led to the use of several different types of CAPTCHA checks.

CAPTCHA tests should also consider accessibility features such as screen readers used by visually impaired people. Since these work like a bot, this can make the whole process somewhat counter-intuitive. Even so, this has been one of the motivating factors behind the evolution of CAPTCHA controls.

It is also important to note that CAPTCHA tests are offered by different providers. Websites that offer such tests connect to the service provider that runs the actual tests. As such, you may not be able to find all types of checks from a single vendor.

This article highlights the different types of CAPTCHA tests available. Some of the older versions fell out of favor as newer versions took over, providing better performance and accuracy.

human-assisted OCR

Human-assisted OCR is one of the most well-known types of CAPTCHA tests, made popular by Google through its ReCAPTCHA service. It uses distorted images of text, which users attempting to login or fill out a form must decipher. The text used is scanned text that has not passed OCR (Optical Character Recognition) and comes from sources such as Google Books. As such, solving this type of CAPTCHA keeps websites more secure and allows users to make valuable contributions to the literary world. Human-Assisted OCR also includes an audio equivalent, allowing hearing-impaired users to complete the test.


No CAPTCHA, as its name suggests, is an invisible CAPTCHA test for the user. The test uses an algorithm that collects various data points about the user trying to login or fill out a form. These data points can include how they move the mouse, if they are logged into their Gmail account, etc. The user must check a box labeled I’m not a robot with the click itself counted as one of the data points.

Logic Questions

Logic question tests present the user with logical questions to complete. These questions are designed so that a seven-year-old child can complete them. Examples include working out single-digit addition and entering numbers into digits.

Image recognition

In image recognition, users need to identify a specific object located in an image. These come in different flavors including a single image which is divided into sections using a grid and separate images displayed next to each other. In any case, the user must make one or more selections depending on the question asked to pass the test.

User interaction

User interaction testing involves a simple interaction test, such as moving a cursor on the screen. Although this may seem overly simplistic, computers can struggle to perform this type of test.


TYPE-IN is a CAPTCHA test that includes an ad with a related question that users must answer to pass the test. Questions usually involve typing text directly related to the ad. The main idea behind this is to kill two birds with one stone – increase website security through a CAPTCHA test while having another source of income.

The future of CAPTCHA controls

As technology advances, CAPTCHA tests must evolve in response to continue to distinguish between humans and computers. While a few years ago it would have been impossible for a computer to recognize a given image, advances in deep learning have made this entirely possible. This is just one example of how CAPTCHA testing has evolved due to advancements in technology.

Computing power is progressing at an incredible rate by obeying Moore’s law, where it doubles in power every year. My first computer was an Amiga 600. It had a single processor running at 7Mhz. Today my computer has the equivalent of six processors, each running at 4500Mhz.

Current discussions of future CAPTCHAs include augmented reality, games, and puzzles like rotating objects. However, as computers continue to evolve, it’s unclear what the future of CAPCHAs will look like. This is especially true when you consider that CAPTCHAs need to be universally solvable by humans – not an easy task by any stretch of the imagination considering cultural and linguistic constraints.

CAPTCHA verifies WordPress websites

CAPTCHA remains the best way to fight spam and automated attacks. Thanks to CAPTCHA 4WP, adding CAPTCHA to your WordPress website is easier than ever thanks to its intuitive user interface. It comes with plenty of out-of-the-box options and integrations, helping you keep your site secure at every level.

The post office The Different Types of CAPTCHA Checks for WordPress Websites appeared first on WP White Security.

*** This is a syndicated blog from the Security Bloggers Network of WP White Security written by Joel Farrugia. Read the original post at:

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