Reference

OPC UA compared

Honest comparisons, written by people with nothing to sell on either side of them. OPC UA is not better than MQTT or Modbus; it does a different job, and the useful question is which job you actually have.

Published

OPC UA vs MQTTTwo different jobs: MQTT moves bytes cheaply, OPC UA moves typed, browsable, self-describing machine semantics.OPC UA vs ModbusRegisters with no meaning versus a self-describing information model.OPC UA vs OPC Classic (DA)Windows COM/DCOM versus a platform-independent, secure-by-design standard.

Planned

Comparison pages are written last, deliberately: the incumbents on these queries are strong and structurally biased, and the way to beat them is to be the balanced version rather than the fast one. Queued: OPC UA vs Sparkplug B, OPC UA vs Modbus TCP, OPC UA vs OPC Classic (DA/A&E/HDA), OPC UA client-server vs PubSub, OPC UA vs MTConnect, OPC UA vs PROFINET, OPC UA vs EtherCAT / ADS, OPC UA vs REST API, UaExpert vs opcua-commander vs Prosys Browser, asyncua vs node-opcua vs open62541, OPC UA over TSN vs standard Ethernet.

Last verified 7 September 2026 against OPC UA 1.05.07. OPC UA Connect is an educational resource and is not affiliated with the OPC Foundation.