Reycob Form Firewallv1.3.9
Protects public WordPress forms, login, registration, comments, and WooCommerce product reviews with a local CAPTCHA and rate limits.
Alternatives to Hashcash
Plugins below are selected for functional relevance and current directory signals. Active-install counts do not affect this ranking.
Relevant replacements
WordPress plugins with similar use cases
Compatibility and update metadata provide context, not a quality guarantee. Review each plugin’s details for your site.
Self-hosted image CAPTCHA and silent honeypot for Login, Registration, Lost Password, and Comments forms. No API keys, no external services.
Kaya Login Captchav1.1.0
Protects the WordPress login, registration and lost-password forms with a simple captcha. No third-party APIs, services or dependencies required.
SecureGate Captcha Litev1.1.1
Complete site security with Cloudflare Turnstile, Math & Character CAPTCHA. High-performance protection for Login, Registration, and Comment forms.
Block comment and form spam without CAPTCHAs. Lightweight honeypot protection works automatically and keeps real visitors moving.
Redeyed Sentinelv1.0.7
Free CAPTCHA and IP-reputation for WordPress login, registration, lost-password and comments, with a block log. Inert until your keys are set.
Privacy-friendly Cloudflare Turnstile CAPTCHA for WordPress login, registration, comments & WPForms. Stops bots and spam.
Completely free VAPTCHA human verification for WordPress login, registration, password reset, and comments.
A lightweight math CAPTCHA and spam protection plugin for WordPress login, WooCommerce, and Contact Form 7 forms.
The most complete free WordPress anti-spam plugin. Protects Contact Form 7, comments, login, registration, REST API, and XML-RPC — all in one shield.