HSArticle Math CAPTCHA for Forms

HSArticle Math CAPTCHA for Forms adds a math CAPTCHA to any WordPress form. No API keys. No third-party services. No configuration needed to get started.

Features:

• Math CAPTCHA — addition, subtraction, multiplication with sensible number ranges
• Two display modes: distorted canvas image (bot-resistant) or plain text (accessible)
• Server-side validation — answer stored in PHP session with HMAC signature, never exposed to the client
• Honeypot field — silent bot trap alongside the math challenge
• Rate limiting — blocks IPs after 10 failed attempts per 10 minutes
• Refresh button — generate a new question without reloading
• WPForms auto inject — protect any WPForms (free or pro) without adding a shortcode
• Registered as a CF7 form tag — no unknown tag warnings in the CF7 editor
• Session only starts on pages that actually contain a form — no impact on page caching elsewhere
• Clean admin page under its own menu — not buried under Settings

Supported form plugins:

• Contact Form 7
• WPForms (Free and Pro)
• Any HTML form via the [hs_mcf_captcha] shortcode