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Manufacturing · head to head

Flow Software vs Siemens WinCC Unified

Flow Software logo

Flow Software

Manufacturing

Manufacturing KPI and OEE calculation engine with published list prices, licensed by measure count

From
$11390/one-time
Rated
-
Full reviewWebsite
Siemens WinCC Unified logo

Siemens WinCC Unified

Manufacturing

Siemens web-based HMI and SCADA platform, licensed by PowerTag count inside TIA Portal

From
On request
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Flow Software the 11,390 dollar Starter licence caps at 250 measures and events, which a multi-line plant exhausts quickly once each line contributes a dozen calculations, forcing a jump to the 62,230 dollar tier.; Siemens WinCC Unified licensing counts PowerTags, and archived tags are licensed separately from displayed tags, so a project that adds historian logging late can breach a tier and trigger an unbudgeted step-up purchase.
  • They diverge on capability: Flow Software covers Calculation engine, Siemens WinCC Unified covers TIA Portal engineering.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Flow Software and Siemens WinCC Unified actually diverge.

Attributes where Flow Software and Siemens WinCC Unified differ
AttributeFlow SoftwareSiemens WinCC Unified
Starting price$11390/one-timeOn request
Pricing modelOne-time purchasequote
PlatformsWindows, WebWindows, Web, 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 Flow Software

  • Calculation engine
  • Measure model
  • Historian connectors
  • Manual data entry
  • Event framing
  • Excel and Power BI output
  • Flow dashboards
  • AI Gateway

Only in Siemens WinCC Unified

  • TIA Portal engineering
  • HTML5 runtime
  • PowerTag licensing tiers
  • Unified Comfort Panels
  • Parameter Control
  • Performance Insight
  • JavaScript scripting
  • OPC UA server and client

What people use each for

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

Flow Software

  • A brewery replacing a fragile network of OEE spreadsheets with governed calculations from the same historian datanot Siemens WinCC Unified
  • Reporting specific energy consumption per tonne against an ISO 50001 audit where the calculation method must be documentednot Siemens WinCC Unified
  • Feeding Power BI plant dashboards from a historian without giving analysts direct tag-level accessnot Siemens WinCC Unified
  • A site that needs lab results typed in and combined with automated tag data in the same yield calculationnot Siemens WinCC Unified

Siemens WinCC Unified

  • A machine builder standardising on S7-1500 who wants HMI screens engineered in the same project as the PLC codenot Flow Software
  • Replacing a WinCC V7 plant SCADA before the 2027 support cut-off without changing controller vendornot Flow Software
  • A line supervisory system where operators and supervisors need browser access from tablets with no client software rolloutnot Flow Software
  • A plant already committed to the TIA Portal toolchain, where the cost of a rival SCADA is the second engineering environment and the second set of skills rather than the licencenot Flow Software

Where each one falls short

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

Flow Software

  • The 11,390 dollar Starter licence caps at 250 measures and events, which a multi-line plant exhausts quickly once each line contributes a dozen calculations, forcing a jump to the 62,230 dollar tier.
  • The Unlimited licence requires every engine on a single server or VM, so any multi-server or multi-site topology goes straight to Distributed at roughly double the price with no intermediate option.
  • Maintenance renews at about fifteen percent of the installed base annually, so a large perpetual estate carries a five-figure recurring cost that the headline perpetual price hides.
  • It is a Windows product with a Microsoft data stack, so Linux or container-native deployment strategies do not apply and the server has to be managed on the plant Windows estate.
  • It calculates and reports but does not collect from equipment itself, so an existing historian or OPC layer is a prerequisite and Flow adds cost on top of that rather than replacing it.

Siemens WinCC Unified

  • Licensing counts PowerTags, and archived tags are licensed separately from displayed tags, so a project that adds historian logging late can breach a tier and trigger an unbudgeted step-up purchase.
  • There is no migration tool that converts a WinCC V7 project to Unified, so leaving the classic line before its 2027 support end means rebuilding screens, scripts and alarm configuration by hand.
  • Scripting moved from VBScript to JavaScript, which invalidates the script libraries in-house engineers accumulated over a decade on classic WinCC.
  • It is effectively bound to the Siemens controller stack; connecting Rockwell or Mitsubishi PLCs works through OPC UA but loses the shared tag database that is the main reason to buy it.
  • Three unrelated products share the WinCC name, and buyers who specify WinCC without saying Unified, V7 or OA regularly receive quotes for the wrong platform with different licensing and a different contractor pool.

Pricing, plan by plan

Flow Software

$11390/one-time
  • Starter$11390/one-time
    • 250 KPI measures and events
    • Single server deployment
    • First year of software maintenance included
  • Unlimited$62230/one-time
    • Unlimited KPI measures and events
    • All engines must run on one server or dedicated VM
    • First year of maintenance included
  • Distributed$128450/one-time
    • Unlimited measures with engines distributed across multiple servers
    • Required for multi-server and multi-site deployments
    • Available as an annual subscription at 34,250 USD instead

Siemens WinCC Unified

On request
  • WinCC Unified$undefined/year
    • Engineering licence per seat within TIA Portal
    • Runtime licensed in PowerTag tiers, from 100 tags to unlimited
    • Archived tags licensed separately from displayed process tags

Which should you pick?

Choose Flow Software if

  • You need calculation engine.
  • You work on Windows, Web.
  • You also want measure model.
Flow Software review

Choose Siemens WinCC Unified if

  • You need tia portal engineering.
  • You work on Windows, Web, Linux.
  • You also want html5 runtime.
Siemens WinCC Unified review

Questions people ask

Is Flow Software or Siemens WinCC Unified better?
Neither clearly leads. Flow Software starts at $11390/one-time and Siemens WinCC Unified at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Flow Software or Siemens WinCC Unified?
Flow Software starts at $11390/one-time and Siemens WinCC Unified at On request.
Does Flow Software or Siemens WinCC Unified run on more platforms?
Flow Software runs on Windows, Web. Siemens WinCC Unified runs on Windows, Web, Linux.
What is Flow Software best used for?
Flow Software is most often used for a brewery replacing a fragile network of oee spreadsheets with governed calculations from the same historian data, reporting specific energy consumption per tonne against an iso 50001 audit where the calculation method must be documented, feeding power bi plant dashboards from a historian without giving analysts direct tag-level access, a site that needs lab results typed in and combined with automated tag data in the same yield calculation. Of those, a brewery replacing a fragile network of oee spreadsheets with governed calculations from the same historian data and reporting specific energy consumption per tonne against an iso 50001 audit where the calculation method must be documented are not what Siemens WinCC Unified is typically brought in for.
What can Flow Software do that Siemens WinCC Unified cannot?
Flow Software covers Calculation engine, Measure model, Historian connectors, Manual data entry. Siemens WinCC Unified covers TIA Portal engineering, HTML5 runtime, PowerTag licensing tiers, Unified Comfort Panels.

Answered from the vendors’ own pages

Flow Software: Does Flow publish real prices?

Yes. Starter is 11,390 USD perpetual for 250 measures, Unlimited is 62,230 USD perpetual or 16,595 USD a year, and Distributed is 128,450 USD perpetual or 34,250 USD a year.

Siemens WinCC Unified: Should I buy WinCC Unified or WinCC V7?

Unified, for any new project. V7 and V8 receive no new features and support ends in 2027.

Flow Software: Is perpetual licensing still offered?

Yes, at every tier, with the first year of maintenance included and renewal at roughly fifteen percent per year. Subscription is available on Unlimited and Distributed only.

Siemens WinCC Unified: Is WinCC OA the same product?

No. WinCC OA came from ETM, has its own engineering environment and licensing, and is aimed at very large distributed systems. It shares only the brand.

Flow Software: Do I need a historian as well?

Effectively yes. Flow reads from historians, databases and OPC sources; it is a calculation layer, not a data collector.

Siemens WinCC Unified: What is a PowerTag?

An externally connected process variable in the runtime. Internal tags do not count, but archived tags are licensed separately from displayed ones.

Flow Software: What counts as a measure?

Each configured KPI or event definition. A single line typically consumes ten to thirty, which is what makes the 250 Starter cap tighter than it looks.

Siemens WinCC Unified: Can operators use it from a browser without installing anything?

Yes, the runtime is HTML5, but concurrent browser clients need WebUX or Unified client licences.

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