bot-defense

Open-source, frictionless CAPTCHA and bot defense. A privacy-focused alternative to reCAPTCHA and hCaptcha.

hCaptcha — independent third-party profile of a public API surface, by API Evangelist. hCaptcha, operated by Intuition Machines, is a privacy-focused CAPTCHA and bot-defense platform used as a drop-in replacement for Google reCAPTCHA. The free Publisher and Pro tiers offer a JavaScript widget and a server-side /siteverify endpoint that issue and ve

Behavior-first bot defense with explainable, privacy-limited decisions.

Cloudflare Turnstile — independent third-party profile of a public API surface, by API Evangelist. Cloudflare Turnstile is Cloudflare's free, smart CAPTCHA alternative that verifies real users without sending traffic through Cloudflare's network. It runs non-interactive client-side challenges (proof-of-work, proof-of-space, web API probing, browser

Public threat-model and defense design notes for coordinated machine-scale abuse.

F5 Distributed Cloud Services — independent third-party profile of a public API surface, by API Evangelist. F5 Distributed Cloud Services (F5 XC) is a SaaS-based platform providing distributed multi-cloud application security, networking, and edge infrastructure including web application and API protection (WAAP), DDoS mitigation, bot defense, mult

Friendly Captcha — independent third-party profile of a public API surface, by API Evangelist. Friendly Captcha is a privacy-first, GDPR-compliant bot protection service from Germany that uses proof-of-work cryptographic puzzles instead of image-labeling challenges. The widget solves a puzzle in the background while a user fills out a form, then su