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Manufacturing · head to head

Aras Innovator vs Kepware Server

Aras Innovator logo

Aras Innovator

Manufacturing

Subscription PLM platform where every module is included in the seat price

From
Free
Rated
-
Full reviewWebsite
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

The short version

  • Only Aras Innovator has a free tier, so it costs nothing to try first.
  • Each has a real cost: Aras Innovator aras publishes no prices at all, so you cannot sanity-check a quote against a list price and every negotiation starts from the vendor knowing more than you do.; 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.
  • They diverge on capability: Aras Innovator covers Model-based configuration, Kepware Server covers 150-plus device drivers.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Aras Innovator and Kepware Server actually diverge.

Attributes where Aras Innovator and Kepware Server differ
AttributeAras InnovatorKepware Server
Starting priceFreeOn request
Free tierYesNo
PlatformsWeb, Windows, Cloud, Self-hostedWindows, Linux

Identical on both: pricing model (quote), 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 Aras Innovator

  • Model-based configuration
  • Upgrades included
  • All applications in one subscription
  • CAD data management
  • Effectivity and configuration management
  • Community Edition
  • Open REST and OData APIs

Only in Kepware Server

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

What people use each for

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

Aras Innovator

  • A manufacturer whose current PLM cannot be upgraded because past customisations would break, and who wants configuration that survives releasesnot Kepware Server
  • An engineering organisation that needs requirements, quality and change management under one data model without buying three modulesnot Kepware Server
  • A medical device or aerospace firm needing full traceability from requirement to as-built serial numbernot Kepware Server
  • A company piloting PLM on a real programme using the free 50-user Community Edition before committing budgetnot Kepware Server

Kepware Server

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

Where each one falls short

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

Aras Innovator

  • Aras publishes no prices at all, so you cannot sanity-check a quote against a list price and every negotiation starts from the vendor knowing more than you do.
  • The platform ships as a toolkit rather than a configured process, so a first implementation is typically a six to twelve month engagement with an integrator, and services frequently cost more than the first two years of subscription.
  • The Community Edition is capped at 50 named users, gets only annual releases and excludes Aras-performed upgrades, so it is a genuine free tier but a deliberately awkward place to stay.
  • Configuration flexibility invites over-customisation; organisations that model every local exception end up with a system only two internal people understand, which is the same trap they left their previous PLM to escape.
  • CAD connectors are not all equal in maturity, and some are excluded from the base subscription, so a shop standardised on a less common CAD tool should confirm connector scope in writing before signing.

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.

Pricing, plan by plan

Aras Innovator

Free
  • Community EditionFree
    • Up to 50 named users
    • Core product data platform
    • Yearly release cadence only
  • Subscription (Standard, self-hosted)$undefined/year
    • Named-user subscription
    • All applications included
    • Quarterly releases
  • Subscription (SaaS)$undefined/year
    • Aras-hosted and operated
    • All applications included
    • Quarterly releases

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

Which should you pick?

Choose Aras Innovator if

  • You need model-based configuration.
  • You want to start without paying.
  • You work on Web, Windows, Cloud, Self-hosted.
  • You also want upgrades included.
Aras Innovator review

Choose Kepware Server if

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

Questions people ask

Is Aras Innovator or Kepware Server better?
Neither clearly leads. Aras Innovator starts at Free and Kepware Server at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Aras Innovator or Kepware Server?
Aras Innovator has a free tier; the other does not. Paid plans start at Free for Aras Innovator and On request for Kepware Server.
Does Aras Innovator or Kepware Server run on more platforms?
Aras Innovator runs on Web, Windows, Cloud, Self-hosted. Kepware Server runs on Windows, Linux.
Can I use Aras Innovator for free?
Yes. Aras Innovator has a free tier, so you can try it without paying. Kepware Server starts at On request.
What is Aras Innovator best used for?
Aras Innovator is most often used for a manufacturer whose current plm cannot be upgraded because past customisations would break, and who wants configuration that survives releases, an engineering organisation that needs requirements, quality and change management under one data model without buying three modules, a medical device or aerospace firm needing full traceability from requirement to as-built serial number, a company piloting plm on a real programme using the free 50-user community edition before committing budget. Of those, a manufacturer whose current plm cannot be upgraded because past customisations would break, and who wants configuration that survives releases and an engineering organisation that needs requirements, quality and change management under one data model without buying three modules are not what Kepware Server is typically brought in for.
What can Aras Innovator do that Kepware Server cannot?
Aras Innovator covers Model-based configuration, Upgrades included, All applications in one subscription, CAD data management. Kepware Server covers 150-plus device drivers, OPC UA server, IoT Gateway, DataLogger.

Answered from the vendors’ own pages

Aras Innovator: Is Aras Innovator open source?

No. The source is not open. The Community Edition is free of licence fee for up to 50 named users under a revocable licence, which is not the same thing.

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.

Aras Innovator: Can I buy a perpetual licence?

No. Aras sells subscription only. If a perpetual PLM licence is a procurement requirement, Aras is out.

Kepware Server: Is a perpetual licence still available?

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

Aras Innovator: Do upgrades cost extra?

No, and that is the central commercial claim. Aras performs upgrades of subscriber environments, including customised ones, as part of the subscription.

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.

Aras Innovator: How many modules do I have to buy?

One subscription covers all applications. Some CAD connectors are the exception, so confirm yours is in scope.

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.

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