f13dev

Add Google reCaptcha to the comments section on blog posts. Requires Google reCaptcha v2 Checkbox API key.
Simple configuration via the admin settings page: 
* reCaptcha public key 
* reCaptcha private key 
* enable reCaptcha for (Everyone | Visitors | Nobody [disabled])
Additional hooks for programmers: 
$v = apply_filters(‘f13_recaptcha_add’); 
Will place a reCaptcha checkbox in the desired place.
$validate = apply_filters(‘f13_recaptcha_validate’); 
if (!empty($validate)) { 
 $v = $validate 
 // reCaptcha failed 
} else { 
 // reCaptcah passed 
}

F13 reCaptcha

Add Google reCaptcha to the comments section on blog posts. Additional hooks for adding reCaptcha to custom forms.

sightfactory

Increase security and protect against bots, spammers and hackers. Cloudflare Turnstile is a friendly, free CAPTCHA replacement that delivers a frustration-free experience to website visitors.
<h4>USE OF 3RD PARTY SERVICES</h4>
VisualWP Cloudflare Turnstile relies on <a href="https://www.cloudflare.com/products/turnstile/" rel="nofollow ugc">Cloudflare Turnstile</a>, a 3rd party API that connects to Cloudflare servers to generate the anti-spam field that appears on the WordPress login form, register form, comment form and any Ninja Form that the field is manually added to. The anti-spam check will not work if website traffic to Cloudflare servers is blocked or impeded. Cloudflare has to look at some session data (like headers, user agent, and browser characteristics) to validate users without challenging them. Learn more by visiting Cloudflare <a href="https://www.cloudflare.com/website-terms/" rel="nofollow ugc">Terms of Service</a> and <a href="https://www.cloudflare.com/privacypolicy/" rel="nofollow ugc">Privacy Policy</a>
<a href="https://www.cloudflare.com/products/turnstile/" rel="nofollow ugc">Login or Register on Cloudflare</a> to generate your site key, secret key and setup approved domains. Customers are limited to 1 million siteverify calls per month during the open beta or can upgrade to <a href="https://developers.cloudflare.com/bots/get-started/bm-subscription/" rel="nofollow ugc">Enterprise Bot Management</a> via Cloudflare website for cases exceeding the free tier.
<h4>CLOUDFLARE TERMS OF USE AND PRIVACY POLICY</h4>
Terms of Service: <a href="https://www.cloudflare.com/website-terms/" rel="nofollow ugc">https://www.cloudflare.com/website-terms/</a> 
Privacy Policy: <a href="https://www.cloudflare.com/privacypolicy/" rel="nofollow ugc">https://www.cloudflare.com/privacypolicy/</a>

VisualWP Cloudflare Turnstile – Easy Anti-Spam alternative to CAPTCHA

Increase security and protect against bots, spammers and hackers with Cloudflare Turnstile, a friendly, free CAPTCHA replacement

F13 reCaptcha vs VisualWP Cloudflare Turnstile – Easy Anti-Spam alternative to CAPTCHA