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Head-to-head · Physics Simulation Software

Ansys Fluent vs ngspice

  • Updated Oct 2026
  • Both researched from official sources
  • 3 checks side by side
Higher score Ansys Fluent #2 in Physics Simulation Software 9.3/10 Pricing on request · 30-day trial Free trial✓ 2 of 6 features Visit Ansys Fluent
ngspice #6 in Physics Simulation Software 8.3/10 Free plan Free plan✓ 0 of 6 features Visit ngspice

Ansys Fluent leads on 0 checks, ngspice on 0, and 3 are even. Who comes out ahead on the 3 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreAnsys Fluent · 9.3/10
  • Free planonly ngspice
  • Free trialonly Ansys Fluent
  • Most featuresAnsys Fluent · 2 of 6

Ansys Fluent scores higher on our rubric for physics simulation software: 9.3 against 8.3 out of 10; our editors rank them #2 and #6.

Ansys Fluent is the better fit for enterprise CFD and HPC teams. ngspice is the better fit for open-source circuit simulation developers.

  • Ansys Fluent fits best

    Enterprise CFD and HPC teams

  • ngspice fits best

    Open-source circuit simulation developers

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Side by side

Feature Ansys Fluent 9.3/10 Visit ↗ ngspice 8.3/10 Visit ↗
At a glance
Editor score 9.3 8.3
Ranking #2 in Physics Simulation Software #6 in Physics Simulation Software
Best for Enterprise CFD and HPC teams Open-source circuit simulation developers
Pricing model Paid Free
Starting price Pricing on request · 30-day trial Free plan
Free plan Not checked yet ✓ (best)
Free trial 30 days —
Deployment Cloud, Desktop Self-hosted, Desktop
Platforms Web, Windows, Linux Windows, macOS, Linux
Support Community, Docs Community, Docs, Tickets
Integrations 4 integrations 4 integrations
Built for Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features Ansys Fluent 2/6 · ngspice 0/6
Lesson library Not checked yet Not checked yet
Authoring tools Not checked yet Not checked yet
Assessment tools Not checked yet Not checked yet
3D visuals ✓ (best) Not checked yet
Offline access Not checked yet Not checked yet
Data export ✓ (best) Not checked yet
Specs
Delivery mode Hybrid Not checked yet
Our review
Pros
  • Advanced turbulence, reactive, multiphase and combustion models
  • Native GPU, multi-GPU and HPC computation support
  • Web access, customization and broad Ansys integrations
  • Advanced DC, AC, transient, noise, distortion, and sensitivity analyses
  • Mixed-signal, Monte Carlo, Verilog-A, Verilog, and VHDL capabilities
  • SPICE model compatibility plus KiCad, Verilator, GHDL, and OpenVAF integrations
Cons
  • Commercial pricing requires a sales conversation
  • Not open source
  • Its depth may exceed the needs of simpler simulation projects
  • No built-in schematic entry
  • Requires netlists or command files for simulation input
  • Focused on electrical simulation rather than general physics
Our verdict

Ansys Fluent is commercial computational fluid dynamics software for engineers and researchers modeling complex fluid behavior. Its scope includes fluid flow, heat and mass transfer, chemical reactions, turbulence, combustion, multiphase…

Read the review →

ngspice is a free, open-source SPICE-compatible simulator for analog, digital, and mixed-signal electrical circuits. It is aimed at developers and engineers who need detailed circuit analysis on Windows, macOS, or Linux, along with…

Read the review →
  1. Ansys FluentPhysics Simulation Software 9.3Pricing on request · 30-day trial
  2. ngspicePhysics Simulation Software 8.3Free plan

Strengths and trade-offs

  • Ansys Fluent — where it wins

    • Advanced turbulence, reactive, multiphase and combustion models
    • Native GPU, multi-GPU and HPC computation support
    • Web access, customization and broad Ansys integrations

    Where it doesn't

    • Commercial pricing requires a sales conversation
    • Not open source
    • Its depth may exceed the needs of simpler simulation projects

  • ngspice — where it wins

    • Advanced DC, AC, transient, noise, distortion, and sensitivity analyses
    • Mixed-signal, Monte Carlo, Verilog-A, Verilog, and VHDL capabilities
    • SPICE model compatibility plus KiCad, Verilator, GHDL, and OpenVAF integrations

    Where it doesn't

    • No built-in schematic entry
    • Requires netlists or command files for simulation input
    • Focused on electrical simulation rather than general physics
  • Ansys Fluent9.3/10 · Pricing on request · 30-day trial

    A deep CFD and HPC environment for demanding industrial simulation work.

    Visit Ansys FluentFull verdict →
  • ngspice8.3/10 · Free plan

    A free, open-source simulator for advanced circuit analysis across desktop platforms and APIs.

    Visit ngspiceFull verdict →

More comparisons

All physics simulation software comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update