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FIG. 075EEngineering

COMOS

by Siemens

Object-oriented plant engineering and lifecycle software from Siemens, built around a central database shared by process, P&ID, electrical and instrumentation work. It extends into operations with maintenance, mobile field work and brownfield digitalisation features.

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Specification

Vendor
Siemens
Categories
P&ID & Schematics, Electrical & Instrumentation, Engineering Information & Digital Twin
Phase
EEngineering
Status
Active
Deployment
Desktop
Licensing
Commercial licence
Standards
None documented
Official site
siemens.com

Capabilities

  1. aCentral object-oriented engineering database
  2. bSmart templates for P&IDs and modular engineering
  3. cDocument management and compliance workflows
  4. dMobile Worker for field updates
  5. eBrownfield digitalisation from scans and drone imagery

Assessment

The most integrated single-database approach from schematics to operations, especially attractive for owners and EPCs aligned with Siemens automation.

  1. Capability25%8/10

    One object-oriented database spans process, P&ID, electrical and instrumentation engineering and continues into operations.

  2. Interoperability20%8/10

    Strong connections to automation and the Siemens industrial software portfolio, plus document and compliance workflows.

  3. Scale15%8/10

    Used on large plant engineering and lifecycle programmes, particularly in chemicals and process industries.

  4. Usability15%6/10

    Highly configurable, which also means significant set-up and training.

  5. Deployment10%7/10

    Typically on-premises, with mobile field components and brownfield digitalisation tools.

  6. Ecosystem15%7/10

    Strong in Europe and among Siemens automation customers.

Strengths

  • Single database across disciplines
  • Lifecycle reach into operations
  • Siemens automation alignment

Considerations

  • Configuration-heavy implementations
  • Less common in North American EPCs
  • 3D design typically comes from other systems

Editorial assessment from public documentation, 23 October 2026. Not a hands-on benchmark. Methodology

In the same circuit · P&ID & Schematics

  1. 01
    Octave Facets P&IDOctave
    81
  2. 02
    AVEVA P&ID and DiagramsAVEVA
    78
  3. 03
    COMOSSiemens
    75
  4. 04
    OpenPlant PIDBentley Systems
    71
  5. 05
    AutoCAD Plant 3D toolsetAutodesk
    65
  6. 06
    Octave Facets P&IDWorxOctave
    62

Compare head to head

Sources

  1. COMOSSiemens · accessed 22 October 2026

Plate updated 22 October 2026 · revision 1