Spectre is a lightweight PHP library designed to detect AI browsers and automated bots using a hybrid detection approach.

The library combines server-side User-Agent analysis with client-side JavaScript fingerprinting to identify supported AI browsers and bots. It is designed to integrate with PHP projects such as CMS platforms, analytics systems, content protection tools and API gateways.

Spectre supports detection for AI browsers and bots including Comet, Arc, Brave, SearchGPT, Microsoft Copilot, ClaudeBot and GPTBot, according to the product documentation.

The package uses a modular driver-based architecture and modern PHP features such as enums, readonly properties and strict typing. It is designed to work without external dependencies and can be extended for additional detection requirements.

For improved detection accuracy, the documentation recommends using the hybrid detection method and caching detection results where appropriate.

• Hybrid browser and bot detection

• Server-side PHP detection

• Client-side JavaScript fingerprinting

• AI browser detection

• Comet detection

• Arc detection

• Brave detection

• SearchGPT detection

• Microsoft Copilot detection

• ClaudeBot detection

• GPTBot detection

• Zero external dependencies

• Modular driver-based architecture

• Modern PHP 8.2+ features

• Enum-based browser types

• Readonly properties

• Strict typing

• Custom User-Agent testing

• Conditional content delivery support

• Lightweight library architecture

• Privacy-focused detection approach

• PHP 8.2 or higher

• No external dependencies required