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Head-to-head · Network Simulation Software

GNS3 vs ns-3

  • Updated Oct 2026
  • Both researched from official sources
  • 4 checks side by side
Higher score GNS3 #1 in Network Simulation Software 9.4/10 Free plan Free plan✓ 3 of 3 features Visit GNS3
ns-3 #6 in Network Simulation Software 8.7/10 Free plan Free plan✓ 2 of 3 features Visit ns-3

GNS3 leads on 0 checks, ns-3 on 0, and 4 are even. Who comes out ahead on the 4 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreGNS3 · 9.4/10
  • Free planboth
  • Most featuresGNS3 · 3 of 3

GNS3 scores higher on our rubric for network simulation software: 9.4 against 8.7 out of 10; our editors rank them #1 and #6.

On simulation model, GNS3 gives you Hybrid where ns-3 offers Discrete-event.

GNS3 is the better fit for free, broad multivendor network labs. ns-3 is the better fit for open-source discrete-event research.

  • GNS3 fits best

    Free, broad multivendor network labs

  • ns-3 fits best

    Open-source discrete-event research

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Side by side

Feature GNS3 9.4/10 Visit ↗ ns-3 8.7/10 Visit ↗
At a glance
Editor score 9.4 8.7
Ranking #1 in Network Simulation Software #6 in Network Simulation Software
Best for Free, broad multivendor network labs Open-source discrete-event research
Pricing model Free Free
Starting price Free plan Free plan
Free plan ✓ ✓
Free trial — —
Deployment Desktop, Self-hosted, Cloud Desktop
Platforms Web, Windows, macOS, Linux Windows, macOS, Linux
Support Docs, Community Community, Docs
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features GNS3 3/3 · ns-3 2/3
Real-time emulation ✓ ✓
Hardware-in-the-loop ✓ (best) Not checked yet
Automation API ✓ ✓
Specs
Simulation model Hybrid Discrete-event
Deployment options Desktop Desktop
Documented node limit Not checked yet Not checked yet
Our review
Pros
  • Combines built-in simulation with actual-device emulation
  • Supports local, remote, cloud, and physical-network connections
  • Includes packet capture, Wireshark integration, and a REST API
  • Free and open source for research and education
  • Broad wireless, IP, routing, mobility, and device models
  • Real-time, tracing, visualization, and MPI support
Cons
  • Practical scale depends on available hardware
  • Complex labs may require multiple deployment components
  • Actual-device emulation depends on compatible device images
  • Desktop deployment without a web interface
  • Scenario development uses C++ or Python programs
  • Integrations are limited to a focused set of tools
Our verdict

GNS3 is open-source software for building, configuring, testing, and troubleshooting virtual and real networks. It is designed for network engineers, students, educators, and organizations that need multivendor topologies, certification…

Read the review →

ns-3 is a free, open-source discrete-event network simulator for Internet systems. It is aimed primarily at networking research and education, supporting models for IP and non-IP networks, wireless technologies, routing, applications,…

Read the review →
  1. GNS3Network Simulation Software 9.4Free plan
  2. ns-3Network Simulation Software 8.7Free plan

Strengths and trade-offs

  • GNS3 — where it wins

    • Combines built-in simulation with actual-device emulation
    • Supports local, remote, cloud, and physical-network connections
    • Includes packet capture, Wireshark integration, and a REST API

    Where it doesn't

    • Practical scale depends on available hardware
    • Complex labs may require multiple deployment components
    • Actual-device emulation depends on compatible device images

  • ns-3 — where it wins

    • Free and open source for research and education
    • Broad wireless, IP, routing, mobility, and device models
    • Real-time, tracing, visualization, and MPI support

    Where it doesn't

    • Desktop deployment without a web interface
    • Scenario development uses C++ or Python programs
    • Integrations are limited to a focused set of tools
  • GNS39.4/10 · Free plan

    A free, broad multivendor lab for simulating, emulating, and connecting real networks.

    Visit GNS3Full verdict →
  • ns-38.7/10 · Free plan

    A free, research-focused simulator with broad network models and desktop-based workflows.

    Visit ns-3Full verdict →

More comparisons

All network simulation software comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update