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MQTT CLI vs Eclipse Mosquitto: catalog facts
MQTT CLI	Eclipse Mosquitto
Free Free and open source under the Apache 2.0 licence, backed by HiveMQ.	Free Free and open source under the EPL/EDL licences.
Windows, Command line	Windows, Linux, Self-hosted, Command line
Full MQTT 5.0 and 3.1.1 feature support Interactive shell with syntax highlighting and command history	Supports MQTT 5.0, 3.1.1 and 3.1 Light enough for single-board computers
Command line only, with no graphical interface Some commands only apply to HiveMQ brokers	A broker only, with no graphical interface for managing messages Requires familiarity with MQTT and broker configuration
Downloadable app	Downloadable app, Self-hosted
Open source	Open source
License: Apache-2.0	License: EPL/EDL
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.