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MQTTX vs MQTTy: catalog facts
MQTTX	MQTTy
Free Free to download and use.	Free Free and open source under the GPL-3.0 license.
Windows, macOS, Linux, Web, Self-hosted, Command line	Windows, Linux
Desktop, CLI and web versions share one workflow Supports MQTT 5.0, 3.1.1 and 3.1	Publishes messages and subscribes to MQTT topics Supports multiple connections in separate tabs
Focused on MQTT only, not general HTTP APIs Some features steer toward the EMQX ecosystem	Requires access to an MQTT broker
Downloadable app, Web application, Self-hosted	Downloadable app
Open source	Open source
License not stated	License: GPL-3.0
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 September 24, 2026	Official website Full listing and sources Checked October 8, 2026

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