Friendly Captcha is a captcha service from Germany that helps users protect websites from bots. It works in such a way that no interaction with the captcha service is necessary except for clicking on a checkbox. Thus, the user does not have to select images or decipher bent letters.
European captcha services
A captcha system helps to detect whether a real human or a bot is using a website. This is useful, for example, in the comments section of a blog to prevent bots from creating comments in large numbers. The most popular captcha service is reCaptcha from Google. There are many types of captcha's. A much used system is that images are shown and you have to select the images that contain a certain object.
This category contains services from companies based in a member state of the European Union (EU), the European Economic Area (EEA) and the European Free Trade Association (EFTA).
You can read more about the listing criteria here.
European services
CaptchaFox is a captcha service from Germany, that protects users against bots and spam. It is privacy-focused, accessible, and they offer a free plan. Integrations for WordPress, Node, Vue and React are provided and the multi-user dashboard allows administrators to design the captcha widget.
Captcha is a captcha service from Austria. The proof-of-work system used, does not require user interaction. They offer a WordPress plugin, a Keycloak extension and a Joomla integration.
Swetrix CAPTCHA is a captcha service from the Ukrainian web analytics company Swetrix. The service is open-source, has a focus on privacy and is in the same management panel as the web analytics service.
Self-hosted & Open Source
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