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Head-to-head · Network Simulation Software

GNS3 vs Containerlab

  • 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
Containerlab #7 in Network Simulation Software 8.6/10 Open source ✓ 0 of 3 features Visit Containerlab

GNS3 leads on 0 checks, Containerlab 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 planonly GNS3
  • Most featuresGNS3 · 3 of 3

GNS3 scores higher on our rubric for network simulation software: 9.4 against 8.6 out of 10; our editors rank them #1 and #7.

GNS3 is the better fit for free, broad multivendor network labs. Containerlab is the better fit for automated containerized network labs.

  • GNS3 fits best

    Free, broad multivendor network labs

  • Containerlab fits best

    Automated containerized network labs

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature GNS3 9.4/10 Visit ↗ Containerlab 8.6/10 Visit ↗
At a glance
Editor score 9.4 8.6
Ranking #1 in Network Simulation Software #7 in Network Simulation Software
Best for Free, broad multivendor network labs Automated containerized network labs
Pricing model Free Free
Starting price Free plan Open source
Free plan ✓ (best) Not checked yet
Free trial — —
Deployment Desktop, Self-hosted, Cloud Self-hosted, Desktop
Platforms Web, Windows, macOS, Linux Web, 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 · Containerlab 0/3
Real-time emulation ✓ (best) Not checked yet
Hardware-in-the-loop ✓ (best) Not checked yet
Automation API ✓ (best) Not checked yet
Specs
Simulation model Hybrid Not checked yet
Deployment options Desktop Not checked yet
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
  • YAML topology definitions cover nodes, links, and lab settings.
  • Supports container and virtual-machine network operating systems.
  • Includes lifecycle controls, HTTP automation, CI workflows, and Kubernetes deployment.
Cons
  • Practical scale depends on available hardware
  • Complex labs may require multiple deployment components
  • Actual-device emulation depends on compatible device images
  • Self-hosted deployment places infrastructure responsibility on the team.
  • Some network OS images may require separate vendor access or licensing.
  • AI-assisted features are not included.
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 →

Containerlab is a self-hosted command-line tool for building, deploying, wiring, and managing container-based network labs. It is designed for network engineers, developers, educators, and infrastructure teams that need repeatable…

Read the review →
  1. GNS3Network Simulation Software 9.4Free plan
  2. ContainerlabNetwork Simulation Software 8.6Open source

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

  • Containerlab — where it wins

    • YAML topology definitions cover nodes, links, and lab settings.
    • Supports container and virtual-machine network operating systems.
    • Includes lifecycle controls, HTTP automation, CI workflows, and Kubernetes deployment.

    Where it doesn't

    • Self-hosted deployment places infrastructure responsibility on the team.
    • Some network OS images may require separate vendor access or licensing.
    • AI-assisted features are not included.

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