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Pow Captcha is a WordPress plugin that adds Proof of Work (PoW) captcha verification to your forms. This provides an effective way to prevent spam and bot submissions without requiring users to solve visual puzzles or complete complex challenges.
The plugin integrates seamlessly with popular form plugins including:
<ul>
<li>Contact Form 7</li>
<li>Gravity Forms</li>
<li>And more coming soon</li>
</ul>
Features:
<ul>
<li>Lightweight and fast</li>
<li>No visual puzzles for users</li>
<li>Effective spam protection</li>
<li>Easy integration with existing forms</li>
<li>Customizable difficulty levels</li>
<li>Developer-friendly with hooks and filters</li>
</ul>
<h3>WP-CLI commands</h3>
<h3>Configure the plugin</h3>
wp pow-captcha set_api_key “your-secret-api-key” 
wp pow-captcha set_api_url “https://your-captcha-service.com” 
wp pow-captcha set_enable_on_login_form true
<h3>Check configuration</h3>
wp pow-captcha status
<h3>Clear cache when needed</h3>
wp pow-captcha clear_cache

Pow Captcha

Adds Pow Captcha verification to forms to prevent spam and bot submissions.

Costel Tudose

Protect your Contact Form 7 forms with Google CAPTCHA V2, hCAPTCHA or Cloudflare Turnstile CAPTCHA
Easy integration and supports multiple forms on a single page.
<h3>Google reCAPTCHA V2</h3>
Use <a href="https://www.google.com/recaptcha/admin" rel="nofollow ugc">https://www.google.com/recaptcha/admin</a> to generate Site key and Secret key.
When generating keys, choose Challenge (v2) -> “I’m not a robot” Checkbox
Update Site key and Secret key from Settings => Contact Form 7 Captcha => Google reCAPTCHA
To add reCAPTCHA V2 protection, insert [cf7sr-recaptcha] shortcode above the submit button in your Contact Form 7 form.
Default size of reCaptcha is normal, for compact size use shortcode: [cf7sr-recaptcha size=”compact”] 
Default color theme of reCaptcha is light, for dark theme use shortcode: [cf7sr-recaptcha theme=”dark”] 
Default type of reCaptcha is image, for audio type use shortcode: [cf7sr-recaptcha type=”audio”] 
You can combine multiple attributes, sample shortcode: [cf7sr-recaptcha size=”compact” theme=”dark”] 
You can also force reCaptcha to render in a specific language.
<h3>hCAPTCHA</h3>
Use <a href="https://dashboard.hcaptcha.com/signup" rel="nofollow ugc">https://dashboard.hcaptcha.com/signup</a> to generate Site key and Secret key.
Update Site key and Secret key from Settings => Contact Form 7 Captcha => hCAPTCHA
To add hCAPTCHA protection, insert [cf7sr-hcaptcha] shortcode above the submit button in your Contact Form 7 form.
Default size of hCAPTCHA is normal, for compact size use shortcode: [cf7sr-hcaptcha size=”compact”] 
Default color theme of hCAPTCHA is light, for dark theme use shortcode: [cf7sr-hcaptcha theme=”dark”] 
You can combine multiple attributes, sample shortcode: [cf7sr-hcaptcha size=”compact” theme=”dark”] 
You can also force hCAPTCHA to render in a specific language.
<h3>Cloudflare Turnstile CAPTCHA</h3>
Use <a href="https://www.cloudflare.com/en-gb/products/turnstile/" rel="nofollow ugc">https://www.cloudflare.com/en-gb/products/turnstile/</a> to generate Site key and Secret key.
Update Site key and Secret key from Settings => Contact Form 7 Captcha => Cloudflare Turnstile Captcha
To add Cloudflare Turnstile CAPTCHA protection, insert [cf7sr-turnstile] shortcode above the submit button in your Contact Form 7 form.
Default size of CAPTCHA is normal, for compact size use shortcode: [cf7sr-turnstile size=”compact”] 
Default color theme of CAPTCHA is auto, for light or dark theme use shortcode: [cf7sr-turnstile theme=”light”] or [cf7sr-turnstile theme=”dark”] 
You can combine multiple attributes, sample shortcode: [cf7sr-turnstile size=”compact” theme=”dark”] 
You can also force CAPTCHA to render in a specific language.

Contact Form 7 Captcha

Add reCAPTCHA V2, hCAPTCHA or Cloudflare Turnstile CAPTCHA to Contact Form 7

Pow Captcha vs Contact Form 7 Captcha