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SOS Captcha — Privacy-First Spam Protection Wordpress Plugin - Rating, Reviews, Demo & Download

SOS Captcha — Privacy-First Spam Protection Preview Wordpress Plugin - Rating, Reviews, Demo & Download
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Plugin Description

Stop spam without collecting visitor data.

SOS Captcha protects your WordPress forms with an interactive slider challenge. Visitors drag a handle along a track to prove they are human. The plugin runs entirely on your own server — no tracking, no cookies, no external services.

Privacy by design

  • No tracking pixels or analytics
  • No cookies stored
  • No data sent to external services
  • GDPR, CCPA, and ePrivacy friendly
  • All validation happens on your server

Visitor-friendly slider

  • Touch-friendly interaction works on mobile
  • Most visitors complete it in a few seconds
  • Smooth animation on success

How the protection works

  • Unique cryptographic tokens per session
  • Random checkpoint positions (up to 8 in Free, 15 in Premium)
  • Server-side timing validation
  • Rate limiting (configurable, 60s default)
  • Behavioral analysis (Premium)
  • Honeypot fields and browser fingerprinting (Premium)

Form integrations

  • Contact Form 7 (Free)
  • WordPress Comments (Free)
  • WPForms (Premium)
  • Gravity Forms (Premium)
  • Ninja Forms (Premium)
  • WooCommerce checkout, registration & reviews (Premium)

Authentication form protection (Premium)

  • WordPress login form (wp-login.php) — protect against brute-force attacks
  • User registration form — prevent bot-generated accounts
  • Lost-password form — block password-reset email spam

How it works

SOS presents a slider with randomly positioned checkpoints. Visitors slide a cursor along the track to activate each checkpoint in sequence. Each session generates unique cryptographic tokens with millions of possible combinations and server-side timing validation. Premium plans add behavioral analysis on top.

Free vs Premium

Free version includes:

  • Unlimited forms and submissions
  • Contact Form 7 integration
  • WordPress comments protection
  • Customizable appearance (colors, text)
  • Up to 8 checkpoints per challenge
  • Full GDPR compliance
  • Community support

Premium features:

  • WPForms, Gravity Forms, Ninja Forms integrations
  • WooCommerce protection (checkout, registration, reviews)
  • WordPress login, registration, and lost-password protection
  • Advanced behavioral detection
  • Browser fingerprinting
  • Honeypot fields
  • Local statistics dashboard (privacy-first, no data leaves your server)
  • Priority email support
  • White-label (remove badge)
  • Up to 15 checkpoints per challenge

Upgrade to Premium — from €4.99/month or €47/year.

Technical Highlights

  • Cryptographic security: Unique tokens per session with server-side validation
  • No database bloat: Uses WordPress transients (auto-cleanup)
  • Lightweight: Under 20KB total assets
  • Performance: Cached responses, minimal server load
  • Developer-friendly: Hooks and filters for customization
  • Translation-ready: 10 languages included (EN, FR, DE, ES, IT, PT-BR, AR, JA, ZH, HI)

Compliance

  • GDPR Article 25 (Privacy by Design)
  • CCPA compliant (no personal data collection)
  • ePrivacy Directive compliant (no cookies)

Support & Documentation

  • Documentation at https://sos-captcha.com
  • Community forum (Free)
  • Email support (Premium)
  • French and English support

Source Code

The plugin ZIP ships both the human-readable source (assets/challenge-slider.js, admin/js/sos-admin.js, assets/*.css, admin/css/*.css) and the minified production builds (.min.js, .min.css). WordPress loads the minified versions in production and the source versions when SCRIPT_DEBUG is enabled (define('SCRIPT_DEBUG', true) in wp-config.php).

Privacy Policy

SOS Captcha is designed with privacy at its core:

Data collection: None. We don’t collect, store, or transmit any personal data to external servers.

Cookies: None. The plugin sets no cookies.

External services: None. All processing happens on your WordPress server.

IP addresses: Not stored. Rate limiting uses transient hashes that auto-expire.

Statistics (Premium): Stored locally on your server only. Aggregated counters (blocked spam, form types) with no personally identifiable information.

Licensing (Premium only): When you activate a Premium license, your site URL and license key are sent to https://sos-captcha.com to validate the license. No user data is transmitted.

Hooks for Developers

  • sos_before_validation — Modify validation parameters
  • sos_challenge_created — React to new challenges
  • sos_spam_blocked — Trigger actions when spam is blocked
  • sos_should_show_badge — Control badge visibility

Screenshots

  1. Interactive slider challenge — login protection

    Interactive slider challenge — login protection

  2. Interactive slider challenge — account protection

    Interactive slider challenge — account protection

  3. Interactive slider challenge — comment protection

    Interactive slider challenge — comment protection

  4. Contact Form 7 integration example

    Contact Form 7 integration example

  5. Many Integrations available

    Many Integrations available

  6. Customizable colors to match your brand

    Customizable colors to match your brand

  7. avoid unnecessary challenges

    avoid unnecessary challenges

Similar Plugins:

Default ThumbnailContact Form 7 Image CAPTCHA, WPForms Image CAPTCHA, Contact Form 7 Spam Image CAPTCHA, WPForms Spam Image CAPTCHA, GDPR SOS Inventory Connector For Woocommerce Spam Captcha – Safeguard Your WordPress Website Effortlessly With Spam Captcha For WordPress

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