GNS3 vs NetSim by Tetcos

GGNS39.4Visit NetSim by Tetcos8.9Visit

Higher score G GNS3 #1 in Network Simulation Software 9.4/10 Free plan Free plan✓ 3 of 3 features Visit GNS3

vs

NetSim by Tetcos #4 in Network Simulation Software 8.9/10 Free plan · pricing on request Free plan✓ 3 of 3 features Visit NetSim

• GNS3 fits best

  Free, broad multivendor network labs

• NetSim by Tetcos fits best

  Research-grade protocol and wireless simulation

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Side by side

Feature	GGNS3 9.4/10 Visit ↗	NetSim by Tetcos 8.9/10 Visit ↗
At a glance
Editor score	9.4	8.9
Ranking	#1 in Network Simulation Software	#4 in Network Simulation Software
Best for	Free, broad multivendor network labs	Research-grade protocol and wireless simulation
Pricing model	Free	Free plan + paid
Starting price	Free plan	Free plan · pricing on request
Free plan	✓	✓
Free trial	—	—
Deployment	Desktop, Self-hosted, Cloud	Desktop, Self-hosted
Platforms	Web, Windows, macOS, Linux	Windows
Support	Docs, Community	Email, Phone, Tickets, Docs
Built for	Solo, Small business, Mid-market, Enterprise	Small business, Mid-market, Enterprise
Features GNS3 3/3 · NetSim by Tetcos 3/3
Real-time emulation	✓	✓
Hardware-in-the-loop	✓	✓
Automation API	✓	✓
Specs
Simulation model	Hybrid	Discrete-event
Deployment options	Desktop	Desktop
Documented node limit	Not checked yet	100 nodes
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	Models 5G/6G, satellite, NTN, MANET, Wi-Fi, IoT, VANET, and SDN Combines real-time emulation with hardware-in-the-loop integration Supports Python, MATLAB, C source access, traces, dashboards, and batch automation
Cons	Practical scale depends on available hardware Complex labs may require multiple deployment components Actual-device emulation depends on compatible device images	Windows-based deployment limits platform flexibility Paid editions use contact-sales pricing Protocol source access applies to supported editions rather than the whole product
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 →	NetSim by Tetcos is a Windows-based packet-level, discrete-event network simulator and emulator for research, teaching, commercial industry, and defence work. It is suited to teams studying wired and wireless communication networks,… Read the review →

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

• NetSim by Tetcos — where it wins

  • Models 5G/6G, satellite, NTN, MANET, Wi-Fi, IoT, VANET, and SDN
  • Combines real-time emulation with hardware-in-the-loop integration
  • Supports Python, MATLAB, C source access, traces, dashboards, and batch automation

  Where it doesn't

  • Windows-based deployment limits platform flexibility
  • Paid editions use contact-sales pricing
  • Protocol source access applies to supported editions rather than the whole product

• GGNS39.4/10 · Free plan

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

  Visit GNS3Full verdict →
• NetSim by Tetcos8.9/10 · Free plan · pricing on request

  A research-focused simulator for detailed wired, wireless, and emulated network studies.

  Visit NetSimFull verdict →