Best Free SCADA Software 2026: Desktop vs Browser-Based Options

Not every SCADA project starts with a budget. Whether you're prototyping, running a small pilot, or just want to see live PLC data on a dashboard without a procurement process, there are real free options in 2026 — both open-source, self-hosted tools and free trials of commercial platforms. Here's an honest comparison of what each option actually gives you.

Free and Open-Source SCADA Options

ScadaBR

ScadaBR is a free, open-source SCADA/HMI platform with Modbus, OPC, and BACnet drivers. It runs as a Java web application you self-host, and includes basic tag configuration, graphic screens, and alarm handling. Setup requires comfort with Java application servers and manual configuration — there's no managed hosting option.

Node-RED with a Dashboard Plugin

Node-RED isn't a dedicated SCADA product, but combined with node-red-dashboard and a Modbus or MQTT input node, it can build a functional live dashboard with gauges, charts, and simple alarm logic. It's flexible and free, but every dashboard is hand-wired — there's no built-in historian, and alarm management is whatever you build yourself in flow logic.

ThingsBoard Community Edition

ThingsBoard's open-source Community Edition supports MQTT and has a device management and dashboarding layer that's more polished than most free tools. Native Modbus support is limited compared to the paid Professional Edition, and multi-user access control is restricted in the free tier.

Rapid SCADA

Rapid SCADA is a free, open-source SCADA package for Windows and Linux, built around separate Server, Communicator and Webstation modules with a Modbus driver included. It is genuinely full-featured for the price — tags, trends, alarms and a web interface — and there is no tag-count limit. The trade-off is the learning curve: the module-based architecture and its configuration tools are unlike most other SCADA products, so the first working project takes longer than you would expect.

Scada-LTS

Scada-LTS is an open-source, web-based SCADA built on the same lineage as ScadaBR, run as a Java web application. It covers Modbus, data point configuration, event handling and graphical views. Like ScadaBR, it assumes you are comfortable running and maintaining a Java application server, and documentation is thinner than commercial alternatives.

FUXA

FUXA is an open-source, browser-based SCADA/HMI built on Node.js, with a drag-and-drop editor and support for Modbus, S7, OPC UA and MQTT. It is the most approachable of the open-source options if you want a modern web HMI quickly. It is also the youngest and smallest project here, so expect a smaller community and fewer answers when something breaks.

What about OpenPLC?

OpenPLC comes up often in these discussions, but it is worth being precise: it is an open-source soft PLC and programming environment, not a SCADA/HMI system. It is a good way to run control logic without PLC hardware, and it pairs with any of the SCADA options above — but on its own it will not give you dashboards, alarms or a historian.

Free Trials of Commercial Platforms

If you want a more complete feature set — proper alarm management, a real historian, and vendor support — without paying upfront, free trials of commercial SCADA platforms are usually the faster path:

Option	Trial Length	Credit Card Required	Full Features?
SCADA Desktop	15 days	No	Yes
SCADA Cloud	60 days	No	Yes
Ignition	2 hours per session (unlimited restarts)	No	Yes

Two other commercial platforms come up regularly in the same searches and are worth knowing about. AVEVA Edge (formerly InduSoft Web Studio, and the lineage behind the Wonderware name) publishes limited development and educational editions alongside its paid tiers. FrameworX from Tatsoft, and its FactoryStudio product line, likewise offers a reduced free edition. Both change their tiering periodically, so check the vendor's current terms rather than trusting any comparison article — including this one — on the exact limits.

See our full Ignition SCADA alternative comparison if session-based trial limits are a dealbreaker for your evaluation timeline.

Side by Side

The honest summary, including where our own product loses:

Option	Licence	Runs as	Per-tag fees	Best at	Weakest at
Rapid SCADA	Open source	Windows / Linux	None	Full feature set at zero cost	Unusual architecture, steep first project
ScadaBR	Open source	Java web app	None	Mature driver set	Dated UI, Java server upkeep
Scada-LTS	Open source	Java web app	None	Web access, event handling	Thin documentation
FUXA	Open source	Node.js, browser	None	Quickest modern web HMI	Small project and community
ThingsBoard CE	Open source	Server, browser	None	IoT/MQTT device management	Limited native Modbus; IoT-first, not plant-floor
Ignition	Commercial	Server, browser	No per-tag; priced per module/server	Depth, ecosystem, scale	Entry cost is four figures
SCADA Desktop	Commercial, one-time	Windows desktop	None	Local HMI, historian and alarms with no subscription	Windows only; single machine, not a multi-site server

To be clear about our own entry: SCADA Desktop is Windows-only and built for one engineering station or plant-floor PC. If you need multi-site dashboards, Linux, or a browser-based server that many people log into, the open-source web options or a full platform like Ignition are the better fit, and we would rather you knew that before downloading.

What "Free" Actually Costs You

Open-source tools are free of licensing cost, but not free of time. Expect to spend real hours on server setup, driver configuration, and building alarm/historian functionality that a commercial platform ships with out of the box. For a quick pilot or a hobby project, that trade-off is often worth it. For a production plant floor rollout, the setup and ongoing maintenance time usually costs more than a modest license fee would.

Desktop or Browser-Based — Which Free Option Fits?

If every device you need to monitor sits on one local network and you want data to stay fully on-premise with no ongoing cloud dependency, a desktop tool (ScadaBR self-hosted, or the SCADA Desktop free trial) is the simpler choice. If you need dashboards visible from a browser across multiple sites, or from a phone without VPN access to a local server, a browser-based option (Node-RED dashboards, ThingsBoard, or SCADA Cloud) fits better.

Test Your Setup Before Committing to Any Platform

Whichever SCADA option you're evaluating, you don't need real hardware on hand to test it. A Modbus slave simulator lets you configure realistic holding registers and generate live-changing values, so you can build and test dashboards, alarms, and trend charts in any SCADA tool before your actual PLC or field devices arrive. For Ethernet-connected devices specifically, a Modbus TCP simulator confirms the network path works before you touch production equipment.

Frequently Asked Questions

Is there any SCADA software that is completely free forever?

Yes, several open-source options are free with no time limit: ScadaBR, Node-RED with a dashboard plugin, and ThingsBoard Community Edition. Each requires you to self-host and configure the software yourself, and none include commercial support.

Which SCADA software has no per-tag licensing?

All the open-source options here — Rapid SCADA, ScadaBR, Scada-LTS, FUXA and ThingsBoard Community Edition — are free of tag-count licensing, because they are free of licensing altogether. Among commercial products, Ignition does not charge per tag either (it prices per module and server), and SCADA Desktop is a one-time licence with no tag limit. Per-tag pricing is more common in the traditional HMI/SCADA vendors, which is why it is worth asking the question explicitly before you shortlist anything.

What is the best free SCADA software for a small plant?

For a small plant on a Windows machine with Modbus devices, Rapid SCADA is usually the strongest genuinely free choice, with ScadaBR a reasonable alternative if you prefer a web interface and are comfortable with Java. If the setup and maintenance time matters more than the licence cost — which is often true when one engineer is running everything — a one-time commercial licence such as SCADA Desktop, or a free trial of a larger platform, will usually get you to a working system sooner.

What's the catch with free SCADA software?

Free and open-source SCADA tools typically require more setup time, lack polished alarm management and historian features, offer no vendor support, and may need ongoing maintenance as you self-host the server. They're a good fit for hobbyists, small pilots, or engineers comfortable maintaining their own stack.

Can I try a paid SCADA platform for free before buying?

Yes. SCADA Desktop offers a 15-day free trial with the full feature set, and SCADA Cloud offers a 60-day free trial with no credit card required. Both let you connect real Modbus, MQTT, or OPC UA devices during the trial to evaluate the platform properly before committing.

Should I choose desktop or browser-based free SCADA software?

Choose a desktop tool if your devices are all on one local network and you want data to stay fully on-premise. Choose a browser-based option if you need to view dashboards remotely or across multiple sites without VPN access to a local server.