Welcome to CaptchaLa

CaptchaLa provides smart CAPTCHA and content moderation API services. With simple SDK integration, you can add security protection to your apps in minutes.

See it work in 30 seconds

demo-v1.captcha.la — pure HTML + PHP, MIT-licensed, view-source on every page.

• popup.html — popup mode
• float.html — floating widget
• bind.html — bind to button
• inline.html — inline embed
• server-token.html — server-issued token (anti-replay)

Quick Links

• 5-Minute Quickstart — This guide will help you integrate CaptchaLa CAPTCHA in 5 minutes.
• Web SDK Guide — Web SDK supports all modern browsers with multiple integration methods.
• API Reference — CaptchaLa provides RESTful API for all server-side integrations.

SDK Docs

• Web SDK
• Android SDK
• iOS / macOS SDK
• Flutter SDK
• Electron SDK

Security Modes

• Server-issued Token — Quick Start — Architecture and code samples for the backend-first token flow used in production.
• Server-issued Token — API Reference — POST /v1/server/challenge/issue — parameters, response schema, and error codes.