There are lot of free plugins exists which can help you to add captcha in your wordpress forms. Among theme i sort out eight captcha plugin those are best. Here are they:
1. visualCaptcha
Features that make visualCaptcha your go-to captcha solution:
Demo Here Visit main site Download
2. Captcha
The Captcha plugin allows you to implement a super security captcha form into web forms. It protects your website from spam by means of math logic, easily understood by human beings. You will not have to spend your precious time on annoying attempts to understand hard-to-read words, combinations of letters or pictures that make your eyes pop up. All you need is to do one of the three basic maths actions – add, subtract and multiply. This captcha can be used for login, registration, password recovery, comments forms. There is also a premium version of the plugin, allowing compatibility with BuddyPress (Registration form, Comments form, “Create a Group” form) and Contact Form 7.
3. PlusCaptcha
An evolution of the protection from bots and people without good intentions. Simple to install, simple to use, secure and at the same time help with EcoPlus, the biggest ecology project.
4. 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.
Features:
5. sweet Captcha
sweet Captcha is a free image captcha service putting your users and your website at first priority. Our CAPTCHA protects your website from spam, using a fun and illustrated widget! No typing is required, our Captcha is fully interactive, sweet and easy to use! sweet Captcha is fully integrated as a contact form 7 captcha, comments captcha, log-in captcha, registration captcha, password recovery captcha, custom contact form and more. You can customize your captcha language translation and theme, to have your users interact with any captcha in a fun and playful manner.
6. Are You a Human
Stop spam and bots with PlayThru, the fun, free CAPTCHA alternative! CAPTCHAs infuriate users, increase drop-off, and ruin your site’s user experience. PlayThru is the simple game-based CAPTCHA replacement that people love. It’s easy to install and completely free.
This plugin works effortlessly on comment, registration, and lost password forms, and is compatible with BuddyPress, Gravity Forms, and Contact Form 7. CAPTCHA-related dropoff is five times higher on mobile than on desktop, and the PlayThru spam blocker is optimized for touch, so it works beautifully on mobile devices.
7. NuCaptcha
8. NO CAPTCHA Anti-Spam
Keypic is not a CAPTCHA provider, we completely remove the concept of CAPTCHA! Keypic checks your forms against the comprehensive Keypic Web Service to see if they look like spam or not and lets you review the spam it catches under your blog’s “Comments” admin screen. Keypic also protects your login form from focused hacking attempts, your registration form from unwanted spammers and most other forms that you insert into your website 🙂 If you want a complete antispam solution and you don’t want to install CAPTCHAs plugins or plugins similar to CAPTCHA, this is the right choice for you.
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