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MQTT CLI vs mqttui: catalog facts
MQTT CLI	mqttui
Free Free and open source under the Apache 2.0 licence, backed by HiveMQ.	Free Free and open source under GPL-3.0.
Windows, Command line	Windows, macOS, Linux, Command line
Full MQTT 5.0 and 3.1.1 feature support Interactive shell with syntax highlighting and command history	Interactive topic subscription and message publishing Can print a single topic payload for scripts
Command line only, with no graphical interface Some commands only apply to HiveMQ brokers	Requires access to an MQTT broker
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License: GPL-3.0-or-later
No account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 8, 2026

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