Compare the Top CAPTCHA Software as of August 2024

What is CAPTCHA Software?

CAPTCHAs are a type of security measure used to protect websites from automated bots. CAPTCHA software requires users to input a series of characters or solve a puzzle in order to gain access. CAPTCHAs are typically found on forms, login pages, and other areas where user verification is needed. CAPTCHAs help to ensure that only humans can gain access to protected information. Compare and read user reviews of the best CAPTCHA software currently available using the table below. This list is updated regularly.

  • 1
    MTCaptcha

    MTCaptcha

    MTCaptcha

    MTCaptcha is a smart captcha service that prioritizes privacy and accessibility. It offers an adaptive invisible noCaptcha that is easy for humans but hard for bots, making verification frictionless. MTCaptcha is GDPR and WCAG compliant, ensuring that your data is never sold or shared with third parties. The captcha images are certified colorblind safe and the widget is fully VPAT compliant and optimized for screen readers. MTCaptcha supports any language and can be fully customized to match any webpage. It also supports audio in captcha, making it accessible to users who are visually impaired. MTCaptcha is trusted by Enterprises, Government, NGOs worldwide and is available in all the major world languages. MTCaptcha works around the world, including in China, making it a truly global captcha solution. It is backed by an adaptive Risk Engine that monitors and responds to threats, making it difficult for bots but easy for humans.
    Starting Price: Free plan $0, Paid $85 - $150
  • 2
    ALTCHA

    ALTCHA

    BAU Software s.r.o.

    ALTCHA is a free CAPTCHA alternative that uses a proof-of-work mechanism to protect your website, and online services from spam. ALTCHA uses a proof-of-work mechanism to protect your website, APIs, and online services from spam and unwanted content. Unlike other solutions, ALTCHA is free, open-source and self-hosted, without external services, does not use cookies nor fingerprinting, does not track users, and is fully compliant with GDPR. What makes ALTCHA unique is that it is free, open-source and self-hosted, without external services, does not use cookies nor fingerprinting, does not track users, and is fully compliant with GDPR. Unlike other captcha solutions, ALTCHA does not require users to solve puzzles or captchas and uses a proof-of-work mechanism instead. ALTCHA’s Spam Filter is a GDPR-compliant anti-spam solution automatically classifying user-submitted data and intercepting spam before it reaches you.
    Starting Price: 0
  • 3
    Friendly Captcha

    Friendly Captcha

    Friendly Captcha

    Organizations—from startups to large enterprises—use Friendly Captcha to protect their websites and online services from spam and abuse. Friendly Captcha respects your user’s privacy and works automatically, so your users don’t have to do anything. Based on the underlying mechanisms of the blockchain, Friendly Captcha employs a fundamentally new approach to securely defend your websites and online services from spam and bots. Friendly Captcha does not depend on tracking your users and exploiting personal data. Plus, your users no longer have to deal with tedious labeling tasks. They don’t have to do anything at all.
    Starting Price: €9/month
  • 4
    Turnstile

    Turnstile

    Cloudflare

    Turnstile delivers frustration-free, CAPTCHA-free web experiences to website visitors - with just a simple snippet of free code. Moreover, Turnstile stops abuse and confirms visitors are real without the data privacy concerns or awful UX that CAPTCHAs thrust on users. Give your web visitors an even better experience. Turnstile confirms they are real with no visual puzzle - totally transparent to visitors. Turnstile always preserves the privacy of web visitors on your site - without sacrificing effectiveness. Unlike other CAPTCHA options, we never harvest data for ad retargeting. Deploy in minutes with just a quick code snippet - and totally free of charge. Humans spend about 500 years each day solving CAPTCHAs - wasting time and creating frustration. This is why Cloudflare built a better alternative to CAPTCHAs with Managed Challenge and now Turnstile.
    Starting Price: Free
  • 5
    CaptchaFox

    CaptchaFox

    CaptchaFox

    Online businesses rely on CaptchaFox to defend and safeguard their website and services against automated bot attacks. CaptchaFox protects against account takeover, credential stuffing, spam and scalping while complying with global privacy laws, such as GDPR, CCPA, and more. Through minimized data collection and retention during verification, the privacy of your users is always preserved. CaptchaFox utilizes a variety of data signals and dynamic response challenges to verify the authenticity of visitors without the use of cookies or trackers. The challenges have low friction and are easy for humans to solve but difficult for bots. The service is available in multiple languages and scales to incoming traffic through our global infrastructure. Enterprise customers can access advanced threat insights to achieve complete risk awareness.
    Starting Price: €15/month
  • 6
    Prosopo CAPTCHA
    Prosopo Procaptcha redefines user verification with a unique approach that emphasizes privacy, security, and decentralization. It's a pioneering solution designed to offer an alternative to conventional, centralized CAPTCHA systems that often compromise user privacy. By choosing Prosopo Procaptcha, you're not only safeguarding your applications from bots and malicious actors but also upholding the privacy of your users.
    Starting Price: Free
  • 7
    Yandex SmartCaptcha
    The service identifies requests similar to automatic ones, identifies bots, and filters them out without loss of response speed. For analysis, we use ML models trained on datasets containing data on many years of experience in protecting Yandex web resources. The datasets are regularly updated. The service does not use ready-made images, but generates them independently, making it possible to maintain an 85% level of human recognition while making it difficult for bots to recognize the CAPTCHA. SmartCaptcha is deployed in the Yandex Cloud infrastructure, which complies with international standards and Russian information security laws. Add verification to your site without the “I’m not a robot” button. An invisible captcha will only be seen by users with suspicious-looking requests. The service generates texts for recognition independently, and you can choose their level of complexity.
    Starting Price: $0.800000 per 1000 requests
  • 8
    BotDetect CAPTCHA
    BotDetect™ CAPTCHA generator is a non-stalking form-security solution that uses a mix of measures, that are easy for humans but hard for bots, to prevent automated form posting. BotDetect also provides an audio Captcha alternative to keep websites accessible to people with impaired vision, enabling you to make WCAG and Section 508 compliant websites. The years of Google’s relentless abuses of their organic and paid search monopolies, and the years of their equally relentless campaign of disinformation and FUD about captchas, took a toll among our former competitors there are only two viable players left. During its first decade, BotDetect was unique among Captcha generators in offering many different Captcha image and sound algos. While each of them was easily comprehensible to humans, the random use of multiple Captcha generation algos made the generated captchas extremely difficult to pass automatically.
  • 9
    TextCaptcha

    TextCaptcha

    TextCaptcha

    The TextCaptcha service provides access to textual CAPTCHA challenges via a simple JSON or XML API over HTTP. The question is the textual challenge that should be presented to the user. The answers are the MD5 hashes of correct lower cased answers: you should be able to check responses from real users you challenge with the question against these checksums. A text CAPTCHA is more accessible to visually impaired users than their image-based alternatives like ReCAPTCHA. Using text is also more flexible if for example you need to present the challenge over a text-only channel like SMS or IRC. The problem with text CAPTCHAs is that they provide inherently more information than a distorted image. They are parseable, under the right conditions solveable. With the advent of contextual parsing tools such as Wolfram Alpha, such simple logic puzzles have become easier to solve programatically.
    Starting Price: Free
  • 10
    reCAPTCHA

    reCAPTCHA

    Google

    Fraudulent web activities cost enterprises billions of dollars each year. Security teams need to keep the bad actors out of their websites and ensure that their customers can always get in. reCAPTCHA has been defending millions of sites for almost a decade, and the reCAPTCHA enterprise service builds on this technology with capabilities designed specifically for enterprise security concerns. With reCAPTCHA Enterprise, you can defend your website against fraudulent activity like scraping, credential stuffing, and automated account creation and help prevent costly exploits from automated bots. And, just like reCAPTCHA v3, reCAPTCHA Enterprise will never interrupt your users with a challenge, so you can run it whenever you like without affecting conversion. reCAPTCHA Enterprise uses an adaptive risk analysis engine to keep automated software from engaging in abusive activities on your site.
  • 11
    GeeTest

    GeeTest

    GeeTest

    Traditional captcha identifies bots from legitimate users with cognitive challenge. Humans are good at visual recognition task such as image or item recognition, whereas machines not. However, with the development of machine learning, machines are also capable of these cognition tasks. To defend against the sophisticated bot threats, traditional CAPTCHA has to be harder, which leads to high user friction and translates to reduced conversion rates. To solve the security vs user experience problem, GeeTest developed AI-powered Slide CAPTCHA in 2012. Instead of visual recognition challenge, Powered by massive biometric data collected in the past 8 years, GeeTest built a self-adaptive defense model based on Graph Convolutional Networks (GCN). By analyzing over 200+ parameters, our dynamic defense model provides you with a broader and deeper understanding of bot activities associated with any API.
  • 12
    hCaptcha

    hCaptcha

    hCaptcha

    The top online services rely on hCaptcha Enterprise for best-in-class bot and fraud management. Ad networks see your visitors as the product. We only care whether a visit is good or bad. hCaptcha complies with GDPR, CCPA, LGPD, PIPL, and other global data laws. Protect your services from scraping, account takeovers, credential stuffing, and spam with our advanced machine learning and humanity verification. Minimizing friction for real users is important. hCaptcha uses simple tasks and takes less time for most users while stopping more bot traffic. hCaptcha combined advanced self-supervised machine learning with a novel edge compute approach that uniquely minimizes data collection and retention, delivered from over 250 locations globally for massive scalability. hCaptcha allows websites to earn rewards while blocking bots and other forms of abuse.
  • 13
    Solve Media CAPTCHA TYPE-IN
    Solve Media's CAPTCHA TYPE-IN™ ads are an easy plug-in solution that saves your users time while making your site more secure and more profitable. Instead of struggling with difficult puzzles, users quickly enter a simple brand message or security phrase. Help your users reach their destination quickly and easily, saving them an average of 7 seconds every time. Earn incremental revenue from previously un-monetized placements on a revenue share model. Behind our TYPE-IN™ ads is a sophisticated technology that protects your site from bots, spammers, and attackers. Our security advisory council is comprised of industry-leading experts who drive the technology that makes safe online advertising possible. CAPTCHA is a test to determine if an end user is a human or an automated bot. Did you know that bots account for 25% of web traffic? As a Solve Media partner, some of the industry's best security minds have you protected.
  • 14
    KeyCAPTCHA

    KeyCAPTCHA

    KeyCAPTCHA

    More than 50.000 sites worldwide use our protection. Improve your captcha in 5 minutes. We have captcha plugins for 19 popular content management systems such as Concrete5, phpBB, Simple Machines Forum, MediaWiki, PunBB, MyBB, Movable Type, DataLife Engine, Phorum, Woltlab BB, OpenCart, Pligg, and XOOPS.
  • 15
    Arkose MatchKey

    Arkose MatchKey

    Arkose Labs

    Arkose MatchKey challenges provide a unique user experience, performance improvements, and powerful styling features. Traditional CAPTCHAs don’t work because bots get around them. But Arkose MatchKey challenges are designed to meet modern threats head-on by providing the best of defensibility, usability, and accessibility in one product. In fact, Arkose MatchKey is the strongest CAPTCHA ever made. Arkose MatchKey is a state-of-the-art series of challenges with industry-leading security. An unparalleled variety of 3D imagery. Our strongest challenges may produce more than 1,250 variations of a problem to solve. All are incredibly easy for legitimate users, but the variety makes it incredibly difficult to solve with automation. We use a key image to solve the largest problem with challenge design: Conveying instructions that are universally understandable across all languages and cultures. Large, aesthetically pleasing images are easy to see.
  • 16
    CyberSiARA

    CyberSiARA

    CyberSiARA

    When it comes to fraud, prevention is more cost-effective than cure. By deploying intuitive traffic testing, the CyberSiARA system provides a proactive approach to cyber-security that stops fraud in its tracks. The traffic classification capability differentiates between genuine users and potential attackers in real-time using interactive enforcement challenges – quickly halting both automated and human-driven attacks before a breach can be made. CyberSiARA uses powerful traffic analysis processes to determine user intent. By identifying fraud signifiers in traffic behavior, the system deploys interactive challenges to test activity classified as suspicious. This allows genuine users to enjoy a seamless access experience, while attacks from a broad range of origins are defeated. Traffic designed to overcome authentication challenges is stopped with innovative challenge strategies.
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    GoCaptcha

    GoCaptcha

    GoCaptcha

    GoCaptcha: First 100k verifications free monthly, fortifying websites against bots and spam. Although bots are able to bypass conventional CAPTCHAs, the GoCaptcha challenges have been specifically created to effectively counter modern threats. By offering a combination of defensibility, usability, and accessibility, GoCaptcha is a single product that can handle a variety of challenges. In fact, it's the most powerful CAPTCHA solution available. GoCaptcha provides a better user experience compared to traditional CAPTCHAs. This is because it uses a combination of fun and interactive challenges that are easy for humans to solve but difficult for bots. Overall, the combination of engaging challenges, clear presentation, and accessibility features makes GoCaptcha a more user-friendly and enjoyable CAPTCHA solution.
  • 18
    Simpli5d

    Simpli5d

    Simpli5d

    Our patent pending NLP Technology platform helps you fight against the malicious bot traffic that is eating out on your precious resources and interfering in the browsing experience of the real audience. We do not just prevent bot traffic but also help you understand your real readers. These in-depth insights about their browsing patterns and their preferences help you strengthen your overall strategy to further engage your loyal users and hence boost your traffic organically. Nothing can be better than increasing revenues. Each of our product has an associated revenue stream without any cost and thus directly helps in increasing your profits.
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CAPTCHA Guide

CAPTCHAs are computer generated tests used to determine if the user is a human or a machine. They are typically found on websites, social media, and online forms. The acronym stands for “Completely Automated Public Turing test to tell Computers and Humans Apart”. In other words, it is a security measure designed to prevent bots from automatically signing up for services or manipulating web forms.

CAPTCHAs usually come in the form of distorted text images or audio recordings that require a user to enter the text they see or hear in order to verify their identity as a human being. These types of tests have become increasingly sophisticated over time and now there are multiple variations available such as reCAPTCHA and hCAPTCHA which use puzzles such as image recognition or video identification tasks instead of just text.

The purpose of CAPTCHA tests is twofold: First, they help protect sites from malicious bots by ensuring that only humans can access certain features; second, they allow websites to discourage spam comments by requiring users to prove their humanity before submitting any data. This ensures that comments are posted by real people with legitimate accounts rather than automated scripts.

In addition, some websites may employ CAPTCHAs as an anti-fraud measure when processing payments online since bots cannot complete these tests successfully so any transactions involving them can be flagged as suspicious activity. This ultimately prevents hackers from using stolen credit card information or exploiting vulnerable payment systems.

Overall, CAPTCHAs serve an important role in safeguarding web resources from potential abuse and fraud while still allowing legitimate users access without too much inconveniences. While it may be annoying at times having to decipher fuzzy letters and numbers when trying to access certain features on the internet, doing so helps keep our data safe from those who would exploit it for their own personal gain.

CAPTCHA Features

  • Security: CAPTCHAs provide an extra layer of security to protect websites from bots and automated scripts attempting to gain unauthorized access or perform malicious activities.
  • Accessibility: CAPTCHAs can be used to limit access to sites or services that require authentication, such as online banking or secure web portals. They can also be used in eCommerce transactions where you need to verify a customer’s identity before they can complete the purchase.
  • Spam Protection: CAPTCHAs are commonly used to prevent spam on comment forms, registration forms, and contact pages by verifying that a real person is submitting the form rather than an automated bot.
  • Bot Detection: CAPTCHAs are effective at detecting bots trying to sign up for multiple accounts or gain access to privileged areas of a website. They help identify malicious bot activity before it can do any serious damage.
  • Human Verification: This is perhaps the most important feature of CAPTCHAs—they are designed specifically to make sure only humans can pass them. The challenge type varies from one CAPTCHA system to another, but generally requires some type of visual recognition (e.g., deciphering distorted text) or solving basic mathematical problems.

Types of CAPTCHAs

  • Text-based CAPTCHA: This type of CAPTCHA consists of text that is distorted in some way, usually to make it difficult for computers to read. It requires the user to read and enter the text exactly as it appears.
  • Audio CAPTCHA: This type of CAPTCHA uses audio instead of text, such as a spoken phrase or sound clip, to prompt users to enter an answer. It is designed specifically for people with visual impairments who cannot use a traditional text-based system.
  • Image-based CAPTCHA: This type of CAPTCHA displays an image which contains some kind of obscuring effect, such as blurring or lines, which makes it difficult for computers to distinguish it from other images. The user must then identify the item or objects in the image correctly before they can proceed.
  • 3D CAPTCHA: This type of CAPTCHA presents a 3D image or animation and requires users to rotate the object until its orientation matches what’s shown on screen. The user must then enter the correct angles into a field provided so that authentication can be granted.
  • Video Captcha: This type of Captcha will present a short video clip with one or more frames blurred out, and require users answer questions about what is happening in the video before access is granted.
  • Logic-based CAPTCHA: This type of CAPTCHA requires users to answer a simple logic question or solve a simple math problem before access is granted.

Benefits of CAPTCHAs

  1. Preventing Fraudulent Activity: CAPTCHAs prevent malicious bot activity from occurring, such as registering for accounts with fake or stolen information. This is especially important for websites that require users to submit personal information.
  2. Reducing Spam: CAPTCHAs can reduce spam and other automated content from flooding websites or forums by verifying user input is coming from an actual person.
  3. Enhancing Security: CAPTCHAs help strengthen online security by creating an additional obstacle for potential attackers looking to gain access to private areas of a website or application.
  4. Increasing Privacy Protection: By adding extra layers of protection, CAPTCHAs make it harder for hackers to collect data on legitimate users, thereby increasing the amount of privacy protection offered by a given website or application.
  5. Improving User Experience: With CAPTCHA-based authentication systems, there is less need for complicated registration processes and logging in procedures making it easier and more convenient for users while still providing a secure experience.

Who Uses CAPTCHAs?

  • Web Users: Individuals who visit websites and use online services to fulfill their daily needs. They need to utilize CAPTCHAs to prove that they are humans, thereby preventing any malicious automated software from taking advantage of the website’s resources.
  • Bloggers: Professional or amateur bloggers making posts on platforms such as WordPress and Blogger so that readers can view them. They need to complete a CAPTCHA verification before posting a comment or article to prevent spammers from publishing unwanted content.
  • Forum/Message Board Users: People visiting forums and discussion boards in order to have meaningful conversations with other members about topics of interest. They must pass the CAPTCHA test before posting comments in order to remain anonymous and avoid spamming these boards with unsuitable messages.
  • Social Networking Site Users: Individuals visiting social networking sites like Facebook, Twitter, Instagram, and YouTube who want to interact with friends, family members, and other users. These users must pass the CAPTCHA test before submitting comments or sharing items on these sites in order to protect against automated bots that may post inappropriate content.
  • Online Shopping Customers: People buying goods online through websites such as Amazon, Ebay, etc., who need a secure way of completing their transactions without worrying about potential fraudsters using automated software for illegitimate purposes. A CAPTCHA is used by some online stores as an extra layer of security against these kinds of activities.
  • Email Service Providers: Companies offering email services like Gmail, Yahoo Mail, Hotmail, etc., which require their users to complete a CAPTCHA verification when signing up for an account or performing certain actions in order to protect against address harvesting bots which could be used for phishing attacks or other malicious activities targeting their service users.
  • Online Game Players: Gamers who play online games and often compete against other players in order to progress within the game. They need to complete a CAPTCHA test before signing up for the game or entering competitions in order to protect against bots that can gain an unfair advantage.

How Much Does CAPTCHA Software Cost?

The cost of using CAPTCHAs for websites varies depending on the platform you're using and the type of CAPTCHA you choose. Generally speaking, CAPTCHAs typically range from a few cents to several dollars per implementation, with more complex types of CAPTCHAs such as reCAPTCHA from Google requiring an additional price. It is also important to note that most platforms charge for both valid and invalid attempts, meaning the more successful implementations will carry a higher cost than those which are not properly completed. Additionally, some providers may charge additional fees for customer support or maintenance fees over time.

What Integrates With CAPTCHA Software?

CAPTCHA software can integrate with a variety of types of software. Such integrations are typically used to add an additional layer of security and protect sensitive data. Some software that can integrate with CAPTCHAs include eCommerce platforms, social networks, membership databases, document sharing services, file storage systems, and web applications. Companies may also use CAPTCHA integration to protect against automated signups or to secure the login process for their applications. Integrating CAPTCHAs into these types of software can help increase user safety and limit unauthorized access.

CAPTCHA Trends

  1. Increasing Use of Audio CAPTCHAs: With the growth of mobile device usage, audio CAPTCHAs are becoming more popular. Audio CAPTCHA solutions allow users to listen to an audio file and repeat what they hear with a spoken response. This provides an accessible solution for users who may have difficulty seeing or using traditional text-based CAPTCHAs.
  2. Growing Use of Invisible CAPTCHAs: Invisible CAPTCHAs are gaining traction as they offer a low friction experience for users while still providing security against bots and automated malware attacks. These solutions use machine learning algorithms to detect suspicious behavior from visitors, such as typing patterns and engagement levels on the page, in order to determine whether the user is human or not.
  3. AI-powered Solutions: As technology continues to advance, AI-powered solutions are becoming increasingly popular for verifying user identity through image recognition and facial recognition technologies. These solutions can provide a more secure validation process by requiring users to pass two or more stages of verification, such as entering valid information into a form, answering knowledge-based questions or completing interactive puzzles. With regards to CAPTCHAs, AI can be a double-edged sword. There are a number of powerful CAPTCHA solvers that use AI to solve CAPTCHA challenges like a human would.
  4. Increased Focus on Usability: Captcha developers are prioritizing usability in order to ensure that valid visitors do not have difficulty submitting their forms or accessing content while malicious bots are blocked effectively. Providing an easy-to-use solution means that real customers can easily access the website without any trouble which is beneficial for long term success.

How To Choose the Right CAPTCHA

Selecting the right CAPTCHAs is important for ensuring that your online forms are secure and free from automated attacks. When selecting a CAPTCHA, it is important to make sure that it is difficult enough to deter malicious bots but not so difficult that it becomes too difficult for human users. There are a few key factors to consider when choosing a CAPTCHA:

  1. Difficulty: The chosen CAPTCHA should be challenging enough to prevent automated bots, yet simple enough for humans to understand and complete.
  2. Type: Different types of CAPTCHAs have different levels of difficulty and security. Traditional text-based or numerical CAPTCHAs can be easy for bots to decode, so using more complex images or audio versions may be preferable.
  3. Customizability: Certain options may allow you to customize the design of the CAPTCHA in order to fit with your website’s design and layout. This will help keep users engaged as they won't feel like they're dealing with something unfamiliar.
  4. Accessibility: Make sure you choose a type of CAPTCHA that supports accessibility measures such as audio options for visually impaired users. By considering these four factors, you can ensure that you select the best possible type of CAPTCHA for your website's security needs while still giving your users an enjoyable experience.