> For the complete documentation index, see [llms.txt](https://stephen-tsoi.gitbook.io/stephen-tsoi-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://stephen-tsoi.gitbook.io/stephen-tsoi-docs/messaging-technology/messaging-bus-comparison-series/comparision-19-message-acknowledge.md).

# Comparision #19: Message Acknowledge

<table data-header-hidden><thead><tr><th valign="top"></th><th valign="top"></th><th valign="top"></th><th valign="top"></th><th valign="top"></th></tr></thead><tbody><tr><td valign="top">Product</td><td valign="top">Consumer Acknowledge</td><td valign="top">Acknowledge Type</td><td valign="top">Negative Acknowledge</td><td valign="top">Maximum Unack message</td></tr><tr><td valign="top">ActiveMQ</td><td valign="top">Yes for persistent and non-persistent message</td><td valign="top"><p>Auto Ack</p><p>Client Ack</p><p>Individual Ack</p><p>Transacted</p></td><td valign="top"> </td><td valign="top"> </td></tr><tr><td valign="top">AWS SQS Queue</td><td valign="top">Yes</td><td valign="top"> </td><td valign="top"> </td><td valign="top">120,000 (Standard) / 20,000 (FIFO)</td></tr><tr><td valign="top">Azure Queue Storage</td><td valign="top">Yes</td><td valign="top"> </td><td valign="top"> </td><td valign="top">Depending on the resouce</td></tr><tr><td valign="top">Azure Service Bus</td><td valign="top">Yes</td><td valign="top"><p>Peek-Lock Mode</p><p>Receive-and-Delete Mode</p></td><td valign="top"> </td><td valign="top"> </td></tr><tr><td valign="top">EMQX</td><td valign="top">Yes</td><td valign="top"> </td><td valign="top"> </td><td valign="top"> </td></tr><tr><td valign="top">IBM MQ</td><td valign="top">Yes</td><td valign="top"> </td><td valign="top"> </td><td valign="top"> </td></tr><tr><td valign="top">Kafka</td><td valign="top">Yes</td><td valign="top"> </td><td valign="top"> </td><td valign="top"> </td></tr><tr><td valign="top">RabbitMQ</td><td valign="top">Yes</td><td valign="top"><p>Manual Ack</p><p>Auto Ack</p></td><td valign="top">Yes</td><td valign="top"> </td></tr><tr><td valign="top">Solace PubSub+</td><td valign="top">Yes, for persistent message only</td><td valign="top"><p>Manual Ack</p><p>Auto Ack</p></td><td valign="top">Yes</td><td valign="top"> </td></tr><tr><td valign="top">Tibco EMS</td><td valign="top">Yes</td><td valign="top"> </td><td valign="top"> </td><td valign="top"> </td></tr></tbody></table>

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