Evolution API is an open-source REST API for WhatsApp and multi-channel messaging integration.
The tool addresses the need to programmatically send and receive WhatsApp messages and manage multi-channel conversations through a unified interface. It supports two distinct connection approaches: a free Baileys-based API that leverages WhatsApp Web, suitable for service bots and integrated systems, and the official WhatsApp Cloud API from Meta for higher-volume business use cases. The project integrates natively with platforms including Typebot, Chatwoot, Dify, OpenAI, RabbitMQ, Apache Kafka, Amazon SQS, Socket.io, and S3-compatible storage, allowing developers to build chatbots, automation workflows, and customer service systems without building WhatsApp connectivity from scratch.
Teams should choose this tool if they need WhatsApp messaging capabilities within a larger application ecosystem. The Baileys-based connection suits smaller-scale deployments, service bots, and scenarios where official API costs are prohibitive, though it relies on WhatsApp Web and may face limitations. The Cloud API option serves businesses requiring higher reliability, advanced analytics, end-to-end encryption, and compliance with Meta's policies, accepting per-message costs in exchange. The tool's native integrations with workflow platforms like n8n and Dify, combined with support for message queuing systems and CRM platforms, make it particularly valuable for teams building conversational AI systems or customer engagement workflows that span multiple channels.
The project maintains active development with regular updates and a documented community. The codebase is written in TypeScript and distributed via Docker, supporting deployment flexibility. The tool is part of the Evolution Foundation ecosystem and serves as a messaging engine for related projects including the Evo CRM Community.
