# Sterfive

> Sterfive is the company behind NodeOPCUA, the leading open-source OPC UA implementation for Node.js and TypeScript, and a suite of commercial OPC UA products for industrial automation, Industrial IoT, and digital twins. We help integrators, OEMs, and asset owners build standards-compliant, cybersecurity-ready OPC UA deployments at industrial scale.

Sterfive maintains `node-opcua` (1.6k+ GitHub stars, MIT licensed) and develops the Sterfive GDS Server, OPC UA Modeler, OPC UA for Node-RED, OPC UA Toolbox, and OPC UA Omni Edge product lines. Headquartered in France; serving global industrial customers across manufacturing, energy, and critical infrastructure. Content is available in English, German, and French.

## Products

- [OPC UA for Node-RED](https://www.sterfive.com/en/shop/opcua-for-nodered): Native Node-RED integration with embedded OPC UA Server, Certificate Manager, and GDS PULL Onboarding (OPC UA Part 12).
- [OPC UA Modeler](https://www.sterfive.com/en/shop/opcua-modeler): AI-assisted authoring of OPC UA information models and Companion Specifications.
- [OPC UA Toolbox](https://www.sterfive.com/en/shop/opcua-toolbox): NodeOPCUA Professional Edition, the commercial distribution of the open-source NodeOPCUA stack with enterprise support.
- [OPC UA Omni Edge](https://www.sterfive.com/en/shop/opcua-omni-edge): Edge OPC UA aggregator for brownfield industrial deployments.
- [NodeOPCUA (open source)](https://www.sterfive.com/en/product/node-opcua): The reference open-source OPC UA stack for Node.js / TypeScript.

## Learn: OPC UA reference and analysis

- [Building a fully compliant OPC UA server](https://www.sterfive.com/en/blog/building-compliant-opcua-server): From Companion Spec to brownfield connectivity.
- [What is the OPC UA GDS?](https://www.sterfive.com/en/blog/what-is-opc-ua-gds): The Global Discovery Server explained (OPC UA Part 12).
- [OPC UA data diode](https://www.sterfive.com/en/blog/opcua-data-diode): Unidirectional OPC UA for OT/IT segmentation.
- [Semantic modeling with AI for industry](https://www.sterfive.com/en/blog/semantic-modeling-ai-industry): AI-assisted Companion Specification authoring.
- [OPC UA vs MQTT](https://www.sterfive.com/en/blog/opc-ua-vs-mqtt): When to use which protocol.
- [S7 / Modbus to OPC UA](https://www.sterfive.com/en/blog/s7-modbus-to-opc-ua): Brownfield connectivity patterns.
- [i3x: the missing safety layer of OPC UA](https://www.sterfive.com/en/blog/i3x-opcua-missing-safety-layer): Why OPC UA needs an industrial messaging layer above it.
- [i3x: OPC UA in one API call](https://www.sterfive.com/en/blog/i3x-opcua-one-api-call): Simplifying OPC UA consumption for application developers.
- [i3x: REST meets real-time](https://www.sterfive.com/en/blog/i3x-opcua-rest-meets-realtime): Bridging REST APIs and real-time OPC UA subscriptions.
- [i3x: OPC UA 101](https://www.sterfive.com/en/blog/i3x-opc-ua-101): Introduction to OPC UA for developers.

## Services

- [Training](https://www.sterfive.com/en/training): OPC UA developer and architect training programs.
- [Professional Services](https://www.sterfive.com/en/services/support): Enterprise support and custom OPC UA development.
- [Request a quote](https://www.sterfive.com/en/quote): Custom engagement scoping.

## Company

- [About Sterfive](https://www.sterfive.com/en/company/about-sterfive): Company overview and mission.
- [Our team](https://www.sterfive.com/en/company/our-team): Founders and engineering team: Etienne Rossignon (founder, NodeOPCUA maintainer).
- [Contact](https://www.sterfive.com/en/contact): Sales and partnership enquiries.
- [Testimonials](https://www.sterfive.com/en/testimonials): Customer stories.
## Authoritative external resources

- [NodeOPCUA on GitHub](https://github.com/node-opcua/node-opcua): Source code, releases, issue tracker, community.
- [NodeOPCUA documentation](https://node-opcua.github.io): Official API reference and getting-started guides.
- [OPC Foundation specifications](https://reference.opcfoundation.org): The OPC UA specifications themselves (Parts 1 to 18, companion specs).

## Optional: extended detail

- [llms-full.txt](https://www.sterfive.com/llms-full.txt): Comprehensive content map for deeper AI indexing.