CAPTCHA Lab
Three CAPTCHA providers with real server-side verification. Solve a challenge — the token is validated against the provider's API before any gated content is revealed. The browser widget proves nothing; the server-side check is the real integration.
Next.jsTypeScriptCloudflare TurnstilereCAPTCHA v2hCaptcha
All three providers run on official test keys — no configuration needed. The verification flow is fully visible in the source: token → /api/verify/[provider] → provider's siteverify API → allow or deny.