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Manufacturing · head to head

Kepware Server vs Propel

Kepware Server logo

Kepware Server

Manufacturing

Industrial connectivity server translating 150-plus PLC protocols into OPC UA, formerly KEPServerEX

From
On request
Rated
-
Full reviewWebsite
Propel logo

Propel

Manufacturing

PLM, quality and product information management built on the Salesforce platform

From
On request
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Kepware Server the base server is the small part of the bill; driver suites are priced by protocol family, and a mixed-vendor plant buys several, which is how a connectivity layer alone reaches tens of thousands of dollars.; Propel your product data lives in a Salesforce org, so a future decision to leave Salesforce becomes a PLM migration as well as a CRM one, and the extraction is not trivial.
  • They diverge on capability: Kepware Server covers 150-plus device drivers, Propel covers Item and BOM management.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Kepware Server and Propel actually diverge.

Attributes where Kepware Server and Propel differ
AttributeKepware ServerPropel
PlatformsWindows, LinuxWeb, iOS, Android, Cloud, API

Identical on both: starting price (On request), pricing model (quote), free tier (No), user rating (Not yet rated), category (Manufacturing).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Kepware Server

  • 150-plus device drivers
  • OPC UA server
  • IoT Gateway
  • DataLogger
  • Redundancy Master
  • Security Policies
  • Configuration API
  • Kepware Edge

Only in Propel

  • Item and BOM management
  • Change management
  • Quality management
  • Product information management
  • Supplier collaboration
  • Native Salesforce
  • Licence types

What people use each for

The jobs each tool is most often brought in to do.

Kepware Server

  • Feeding a historian from a mixed plant of Allen-Bradley and Siemens PLCs without writing per-protocol driversnot Propel
  • Publishing CNC machine state from FANUC and Haas controls to an OEE system over MQTTnot Propel
  • Bridging legacy serial Modbus devices into an OPC UA architecture during a phased controller replacementnot Propel
  • Running redundant collection servers so a cloud analytics pipeline does not lose data during Windows patchingnot Propel

Propel

  • A medical device company needing linked design control and CAPA records for an ISO 13485 audit without an on-premise PLM programmenot Kepware Server
  • A consumer products firm publishing the same product record to engineering, packaging and e-commerce teamsnot Kepware Server
  • A company already standardised on Salesforce that wants product data governed with the same admin skills as the CRMnot Kepware Server
  • A hardware manufacturer routing customer complaints straight to the part revision and supplier that caused themnot Kepware Server

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Kepware Server

  • The base server is the small part of the bill; driver suites are priced by protocol family, and a mixed-vendor plant buys several, which is how a connectivity layer alone reaches tens of thousands of dollars.
  • KEPServerEX to Kepware Server 7 is a migration rather than an in-place upgrade, and driver entitlements do not always transfer cleanly, so budget for revalidating every channel.
  • The full driver portfolio is Windows-only; the Linux product, Kepware Edge, supports a subset of drivers and is subscription-licensed by tag count, so an edge-first architecture cannot simply reuse the Windows configuration.
  • Three names have been in circulation for the same lineage, and quotes, forum answers and integrator experience still mix KEPServerEX, ThingWorx Kepware Server and Kepware Server, which produces mismatched proposals.
  • It is a translation layer with no storage, contextualisation or visualisation of its own, so it is always an addition to a historian or platform purchase rather than a substitute for one.

Propel

  • Your product data lives in a Salesforce org, so a future decision to leave Salesforce becomes a PLM migration as well as a CRM one, and the extraction is not trivial.
  • CAD data management is handled through connectors rather than natively; Propel manages metadata and files well but is not a substitute for a CAD vault on large assemblies.
  • The published cost bands are extremely wide, from 10,000 to 500,000 US dollars a year, and setup can approach the annual licence, so early budgeting without a scoped quote is close to meaningless.
  • Licence roles are split across Performance, Quality, Enrichment, Collaboration and Partner types, and buyers frequently discover mid-project that a user needs a more expensive role than budgeted.
  • Salesforce platform limits such as governor limits, API call ceilings and storage allowances apply, and organisations with very large BOMs or heavy integration traffic hit them in ways a purpose-built PLM would not surface.

Pricing, plan by plan

Kepware Server

On request
  • Kepware Server$undefined/year
    • Base server as a perpetual licence with annual maintenance, or subscription
    • Driver suites priced by protocol family and bought separately from the server
    • Advanced plug-ins such as IoT Gateway, DataLogger and Redundancy Master licensed individually

Propel

On request
  • Propel$undefined/year
    • Annual user-based licensing in role types
    • Salesforce platform access included in each licence
    • Indicative small deployment band of 10,000 to 150,000 USD a year plus 10,000 to 25,000 setup

Which should you pick?

Choose Kepware Server if

  • You need 150-plus device drivers.
  • You work on Windows, Linux.
  • You also want opc ua server.
Kepware Server review

Choose Propel if

  • You need item and bom management.
  • You work on Web, iOS, Android, Cloud, API.
  • You also want change management.
Propel review

Questions people ask

Is Kepware Server or Propel better?
Neither clearly leads. Kepware Server starts at On request and Propel at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Kepware Server or Propel?
Kepware Server starts at On request and Propel at On request.
Does Kepware Server or Propel run on more platforms?
Kepware Server runs on Windows, Linux. Propel runs on Web, iOS, Android, Cloud, API.
What is Kepware Server best used for?
Kepware Server is most often used for feeding a historian from a mixed plant of allen-bradley and siemens plcs without writing per-protocol drivers, publishing cnc machine state from fanuc and haas controls to an oee system over mqtt, bridging legacy serial modbus devices into an opc ua architecture during a phased controller replacement, running redundant collection servers so a cloud analytics pipeline does not lose data during windows patching. Of those, feeding a historian from a mixed plant of allen-bradley and siemens plcs without writing per-protocol drivers and publishing cnc machine state from fanuc and haas controls to an oee system over mqtt are not what Propel is typically brought in for.
What can Kepware Server do that Propel cannot?
Kepware Server covers 150-plus device drivers, OPC UA server, IoT Gateway, DataLogger. Propel covers Item and BOM management, Change management, Quality management, Product information management.

Answered from the vendors’ own pages

Kepware Server: Is KEPServerEX discontinued?

The name is. KEPServerEX and ThingWorx Kepware Server have been unified into Kepware Server, currently version 7, and the older names are being retired.

Propel: Do I need to buy Salesforce separately?

No. Each Propel licence includes Salesforce platform access, and end users do not need their own Salesforce licences or Salesforce expertise.

Kepware Server: Is a perpetual licence still available?

Yes for the Windows server, with annual maintenance. Kepware Edge on Linux is subscription-only.

Propel: Does being on Salesforce lock me in?

Practically, yes. The application, its configuration and your product data all sit in a Salesforce org, which is a real consideration at renewal.

Kepware Server: What drives the price?

The number and type of driver suites, not the number of tags on the Windows product. Kepware Edge is priced by tag count.

Propel: What does it cost?

Propel publishes indicative bands rather than list prices: roughly 10,000 to 150,000 US dollars a year for a small deployment and 250,000 to 500,000 for a large one, plus setup.

Kepware Server: Can I evaluate it before buying?

Yes. The runtime works for two hours at a time without a licence, indefinitely, which is enough to prove connectivity but not to run production.

Propel: Is it suitable for regulated medical devices?

Yes, that is a core segment; the quality module covers CAPA, non-conformance, audits and training records with electronic signatures.

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