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Manufacturing · head to head

Kepware Server vs Simplify3D

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
Simplify3D logo

Simplify3D

Manufacturing

Paid 3D printing slicer sold as a one-time licence in a market where rivals are free

From
$199/one-time
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.; Simplify3D every serious competitor is free, so the $199 has to be justified against Cura, PrusaSlicer, OrcaSlicer and Bambu Studio on support and consistency alone, not on capability.
  • They diverge on capability: Kepware Server covers 150-plus device drivers, Simplify3D covers Process-based slicing.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Kepware Server and Simplify3D actually diverge.

Attributes where Kepware Server and Simplify3D differ
AttributeKepware ServerSimplify3D
Starting priceOn request$199/one-time
Pricing modelquoteOne-time purchase
PlatformsWindows, LinuxWindows, macOS, Linux

Identical on both: 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 Simplify3D

  • Process-based slicing
  • Support generation
  • Layer preview
  • Floating licences
  • Offline licensing
  • Wide printer profiles

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 Simplify3D
  • Publishing CNC machine state from FANUC and Haas controls to an OEE system over MQTTnot Simplify3D
  • Bridging legacy serial Modbus devices into an OPC UA architecture during a phased controller replacementnot Simplify3D
  • Running redundant collection servers so a cloud analytics pipeline does not lose data during Windows patchingnot Simplify3D

Simplify3D

  • A print farm running machines from four manufacturers that wants one slicer and one set of profiles rather than fournot Kepware Server
  • An engineering department on an air-gapped network that cannot use a slicer requiring online activationnot Kepware Server
  • A team standardising support and infill settings across operators so prints are reproducible between shiftsnot Kepware Server
  • A shop printing tall parts that need different settings at different heights in a single jobnot 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.

Simplify3D

  • Every serious competitor is free, so the $199 has to be justified against Cura, PrusaSlicer, OrcaSlicer and Bambu Studio on support and consistency alone, not on capability.
  • Major version upgrades are chargeable, so the perpetual licence covers a version rather than the product and the cost recurs every few years anyway.
  • Development cadence is slower than the open source slicers, and features such as newer tree support algorithms and multi-material handling appear there first.
  • Printer profiles for very new machines lag behind the manufacturer's own bundled slicer, so buyers of a brand new printer may get better results from the free tool that shipped with it.
  • Standard licences require an internet connection to activate, and the offline option is a separate purchase negotiated with sales rather than a checkbox at checkout.

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

Simplify3D

$199/one-time
  • Standard licence$199/one-time
    • One user, perpetual for that version
    • Internet activation required
    • Two week money-back guarantee
  • Floating licence$undefined/one-time
    • Shared activation pool for teams
    • Priced on request
    • Volume discounts available
  • Offline licence$undefined/one-time
    • Activation without internet access
    • For secure or air-gapped networks
    • Priced on request

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 Simplify3D if

  • You need process-based slicing.
  • You work on Windows, macOS, Linux.
  • You also want support generation.
Simplify3D review

Questions people ask

Is Kepware Server or Simplify3D better?
Neither clearly leads. Kepware Server starts at On request and Simplify3D at $199/one-time, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Kepware Server or Simplify3D?
Kepware Server starts at On request and Simplify3D at $199/one-time.
Does Kepware Server or Simplify3D run on more platforms?
Kepware Server runs on Windows, Linux. Simplify3D runs on Windows, macOS, Linux.
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 Simplify3D is typically brought in for.
What can Kepware Server do that Simplify3D cannot?
Kepware Server covers 150-plus device drivers, OPC UA server, IoT Gateway, DataLogger. Simplify3D covers Process-based slicing, Support generation, Layer preview, Floating licences.

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.

Simplify3D: Is Simplify3D a subscription?

No. It is a one-time purchase of $199 per user, but upgrades to future major versions cost extra.

Kepware Server: Is a perpetual licence still available?

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

Simplify3D: Why pay when PrusaSlicer and Cura are free?

For a mixed fleet you get one interface and one profile library across brands, plus a supplier to call. If you run one printer from one vendor, the free slicer is usually the better choice.

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.

Simplify3D: Can I install it on more than one computer?

A standard licence is per user with online activation. Teams needing shared or concurrent use buy floating licences, priced on request.

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.

Simplify3D: Can I try it first?

There is a two week money-back guarantee rather than a free trial download.

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