Ignition vs. Litmus
Ignition and Litmus both support MQTT, Sparkplug B, and UNS architectures — but they arrive at connectivity from opposite directions. Ignition is a full industrial application platform where connectivity is one layer of a broader SCADA, HMI, and MES stack. Litmus is purpose-built for the connectivity and edge compute problem, without the application platform overhead. The comparison comes down to whether you need the full Ignition platform or a focused edge-and-connectivity layer.
| Criteria | Ignition (Inductive Automation) | Litmus |
|---|---|---|
| Platform | ||
| Primary function | Full industrial application platform — SCADA, HMI, MES, connectivity, reporting | Protocol translation and containerized edge compute |
| Platform scope | Broad — operational platform with connectivity as one layer | Focused — connectivity and edge application hosting |
| Deployment model | On-premise server; Ignition Edge for field deployment; cloud-deployable | Purpose-built edge hardware or VM; cloud orchestration |
| Licensing | Flat-rate unlimited tags, clients, and users per server | Per-node subscription |
| Connectivity | ||
| Protocol coverage | Built-in OPC-UA for modern PLCs; legacy via third-party modules or Kepware as upstream source | 250+ native drivers including broad legacy coverage |
| Legacy PLC depth | Good for current hardware; deep legacy requires third-party modules or upstream Kepware | Strong native legacy coverage including older Rockwell and Siemens families |
| MQTT / Sparkplug B | Via Cirrus Link MQTT Transmission module; Custom Namespace for UNS alignment; industry-standard UNS backbone choice | Native MQTT and Sparkplug B; built-in topic mapping for UNS |
| UNS architecture | Widely deployed as UNS backbone — Cirrus Link modules are purpose-built for this | Built for UNS-first architectures; native Sparkplug B |
| Edge capabilities | ||
| Edge compute | Ignition Edge supports polling and store-and-forward; limited tag count at edge tier | Full containerized edge environment; deploy custom apps, ML inference, quality logic |
| Offline operation | Store-and-forward via Ignition Edge; full server required for application logic | Full offline-first operation; all edge apps run without WAN |
| Fleet management | Per-server management; scaling requires additional server instances | Centralized fleet management across distributed edge nodes |
| Container hosting | Not supported — Ignition is not a container orchestration platform | Native — run custom Docker containers on edge hardware alongside connectivity |
| Application capabilities | ||
| SCADA / HMI | Full SCADA and HMI development environment | None — connectivity and compute only |
| MES / OEE | Built-in OEE, production tracking, recipe management | None |
| Reporting | Built-in database-driven reporting engine | None |
| Procurement | ||
| Pricing | $$ | $$ |
| Integrator ecosystem | Large certified integrator network; Ignition Exchange marketplace | Growing partner network; less mature than Ignition's SI ecosystem |
Protocol coverage sourced from vendor documentation. Verify driver availability for your specific device models before purchase.
- You need SCADA, HMI, or MES capabilities alongside connectivity — Ignition handles all of them
- You are building a UNS architecture and want the most mature Sparkplug B ecosystem via Cirrus Link
- The flat-rate licensing model delivers better economics than per-node pricing at your scale
- You need reporting, OEE dashboards, or production tracking built into the same platform
- You want access to the large Ignition integrator network and Exchange marketplace
- You need to run containerized applications — ML models, quality logic, local analytics — at the edge alongside connectivity
- Your facilities have unreliable WAN and you need fully autonomous offline edge operation
- You are managing connectivity across many distributed sites and need centralized node fleet management
- You have deep legacy protocol requirements and want native driver coverage without upstream translation layers
- You want a focused tool without the overhead of a full application platform
If you are modernizing a SCADA or MES environment and want connectivity bundled into the same platform that handles visualization and reporting, Ignition is the stronger fit. If your architecture is cloud-native and analytics already live upstream, and your problem is specifically getting clean normalized data from the edge to the cloud — with the ability to run compute at the edge — Litmus is the more focused solution.
These platforms are often complementary rather than competitive. Litmus handles edge-to-MQTT; Ignition handles MQTT-to-application. Evaluate whether your architecture needs both layers or whether one platform can handle the scope you actually need before treating them as an either/or decision.
Related: Kepware vs. Ignition · Kepware vs. Litmus · Full connectivity vendor index