17 個實用的WordPress 驗證碼Captcha插件

1. SI CAPTCHA Anti-Spam

This Worpdress captcha plugin adds CAPTCHA anti-spam methods to WordPress forms for comments, registration, lost password, login, or all. In order to post comments or register, users will have to type in the code shown on the image. it prevents spam from automated bots. it works great with Akismet. Also is fully compatible with WPMU and BuddyPress.

2. Boomcaptcha CAPTCHA

Boomcaptcha CAPTCHA Protect your website from spams using encrypted text and paired with matching web fonts so user will see the challenge text clearly while the spam programs see the underlying encrypted text. It’s a great Captcha solution to prevent spams for comments, login, registration, reseting and password forms. Users will have much better Captcha experience then trying to guess the difficult twisted image based Captcha solution. It’s fun and helps improving user accuracy rate when the answer characters showing the same font.

3. WangGuard

WangGuard CAPTCHA is also prevents anti-spam methods to WordPress forms for comments, registration, lost password, login, or all. its free for personal use untill you earn less than 500 daily registrations or you make less than $200/month.

4. Picatcha

Picatcha is a unique image-identification CAPTCHA that effectively protects your website from Internet abuse – spam and automated bots.

5. Blue Captcha

Blue Captcha is a powerful and highly customized WordPress plugin that effectively protects your WP blogs from spammers and unwanted persons. It is easily installed and provides high protection against spammers, bots or unwanted persons. This plugin can be applied to login form, registration form, commentary form or password recovery form.

6. Really Simple CAPTCHA

Simple CAPTCHA is also powerful WordPress plugin that effectively protects your WP blogs from spammers and unwanted persons. This plugin does not work alone and is intended to work with other plugins. It is originally created for Contact Form 7, however, you can use it with your own plugin.

7. Outerbridge HumanCaptcha

HumanCaptcha is a wordpress plugin which uses questions that require human logic to answer them and which machines cannot easily answer.

Actually most of bloggers will have come across programs that submit spam comments, often with the aim of improving the search engine ranking of a website. By using a CAPTCHA, only humans can enter comments on your blog, and people do not need to sign up before they enter a comment.

8. NuCaptcha WordPress Plugin

NuCaptcha is a free, easy to use WordPress plugin. it provides a complete video CAPTCHA solution with High quality video NuCaptchas, Enhanced security
Greater usability for users, Better conversions, Piece of mind.

9. Spam Captcha

This plugins avoids spam actions on your website. The captcha image and Akismet API are also available for this plugin. its a multilingual wordpress plugin.

10. SD Simple Antispam

SD Simple Antispam prevents comment spam using various, admin-selectable techniques.

11. Secure CAPTCHA

Secure CAPTCHA protect your forms from spam with hard to break and easy to read Secure CAPTCHA images. it allows to distinguish between form submition made by human and script (robot, bot, program etc.). It gives you ability to reject all form submitions made in automatic way. Secure CAPTCHA was designed to be both hard to break with a script and easy to solve by the humans.

12. KeyCAPTCHA

KeyCAPTCHA is a Free anti-spam solution for your site. Unlike many other captchas, it does not require any text typing.

13. Fancy Captcha

Ajax Fancy Captcha is a jQuery plugin that helps you protect your web pages from bots and spammers.

14. IceCaptcha

This is the new generation IceCaptcha plugin. The Anti-Spam security system misses no bots and does not disturb a human being.
The new security system needs clicking on the circle of a particular color instead of entering numbers or other redundant actions. It is done instead of clicking on the button.

15. Sweet Captcha

Sweet Captcha is a free and simple Captcha service putting your users and your website at first priority. Instead of asking the user to input difficult and boring text, Sweet Captcha offers a cute and interactive friendly user experience. The Sweet Captcha consists of a question the user needs to answer by dragging the correct answer.

16. Formidable Forms

It’s a quick and easily build forms with a simple drag-and-drop interface and in-place editing. You can construct custom forms or generate them from a template. Shortcodes can be used as well as spam catching services.

17. WP Pineapple

WP Pineapple adds a fruity looking anti-spam, anti-bot to your comment form. its easy to install and easy for your vistors to use. A perfect plugin for combatting spam.