A free, open-source MQTT.fx alternative
MQTT.fx is a commercial MQTT client with a long history. MQTT Viewer is a free, open-source alternative for macOS, Windows and Linux.
About MQTT.fx
The current MQTT.fx 5.x from Softblade is a commercial desktop client with a Topic Explorer, Sparkplug tooling and vendor support, under paid licences. The original MQTT.fx 1.x was free, which is what most people searching for a free MQTT.fx are after.
Why people choose MQTT Viewer
- Free and open source under GPL-3.0, with no licence to buy.
- A live topic tree with a message timeline and message comparison.
- Up to 10 broker connections at once.
- MQTT v3.1.1 and v5 over TCP, TLS, mutual TLS and WebSocket.
- Sparkplug B, Base64 and Hex decoding.
- Publish and re-publish from a searchable history.
- A native app for macOS, Windows and Linux.
Frequently asked questions
Is MQTT Viewer a free alternative to MQTT.fx?
MQTT Viewer is free and open source under the GPL-3.0 licence, with no licence to buy and no account to create.
What's the difference between the old and new MQTT.fx?
The original MQTT.fx 1.x was free. The current MQTT.fx 5.x from Softblade is a commercial product with paid licences.
Does MQTT Viewer support MQTT 5, TLS, and Sparkplug?
MQTT Viewer supports MQTT v3.1.1 and v5 over TCP, TLS, mutual TLS and WebSocket, and decodes Sparkplug B, Base64 and Hex payloads.
Which platforms does MQTT Viewer run on?
MQTT Viewer is a native desktop app for macOS (Apple Silicon and Intel), Windows, and Linux (x86_64 and ARM64).
See the best MQTT clients overview, or download MQTT Viewer.
MQTT Viewer is free and open source, and runs on macOS, Windows and Linux.
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