IronMQ vs RabbitMQ

IronMQ is a persistent message queue for communication between services and components in distributed applications. It supports push and pull queues, long polling, error queues, alerts, and triggers, as well as dead-letter queues and ordering within each queue. Delivery is described as best-effort and one-time, a behavior application teams should account for in message handling. Its HTTPS and REST-based APIs support HTTP/REST, Amazon SQS, and OpenStack Marconi protocols. During an outage, queues can automatically point to alternative availability zones without code changes. Deployment options include shared, dedicated, and on-premise environments. Documentation lists client libraries for Go, Ruby,.NET, Java, PHP, Python, Node, and Rust, plus community-supported Apache Camel and Clojure libraries. Iron.io says OAuth and SSL protect data in transit, and recommends client-side encryption for especially sensitive payloads at rest. The free Basic plan includes 100K API requests per month, limited queues, and a 64k message size limit. Entry costs $399 a month; a full-feature 14-day trial is offered for non-dedicated clusters.

RabbitMQ is an open source messaging and streaming broker for application communication, including distributed microservices, real-time data, and IoT. Publishers can route messages to one or more consumers using routing, filtering, streaming, and federation. Message acknowledgements and replication across a cluster support delivery reliability, and delivery guarantees are configurable. Supported protocols include AMQP 0-9-1, AMQP 1.0, MQTT, STOMP, RabbitMQ Streams, HTTP, and WebSocket, including browser communication over WebSocket. Client libraries are available for Java, .NET/C#, Erlang, and other languages; the project also offers a community Docker image and Kubernetes operators. RabbitMQ can run in cloud or on-premises environments, on local machines and physical or virtual hardware, and in containers. Linux, Windows, and macOS are supported; z/OS, most mainframes, and systems with less than 100 MB of RAM are not. The free, self-managed Open Source RabbitMQ Server is offered under the Mozilla Public License 2.0 with best-effort community support. VMware Tanzu RabbitMQ is a commercial offering with 24/7 support and enterprise features; pricing is by contact.