WPSignal

A WebSocket relay service that enables real-time event delivery for WordPress sites, eliminating the need for HTTP polling. It solves the problem of inefficient data synchronization by allowing developers to dispatch events from PHP code to all connected browsers. The service targets WordPress developers and engineering teams at companies of various sizes, from startups to enterprises. It is positioned as a developer-focused infrastructure tool with a fluent trigger API, HMAC-signed publishes, and optional AES-256-GCM encryption, delivered as a SaaS with a free tier and enterprise options.

Key features

• Persistent WebSocket connections with SSE fallback
• Keepalive pings every 20 seconds
• HMAC-signed publishes with SHA-256
• Timestamp replay protection and rate limiting
• Fluent trigger API for any action hook
• AES-256-GCM blind relay encryption
• Multi-site support with tenant isolation
• Built-in admin page with live event log
• WebSocket-based Yjs sync provider for collaboration