Best network lab software in 2026: an honest comparison
Every few months someone asks the same question in a forum, a Discord or a job interview: what should I actually use to build a network lab? The honest answer shifted in June 2026, when EVE-NG ended its Community edition and moved its free build to Freemium, which allows 7 nodes per server and admin accounts only. Some advice written before that date is out of date.
We build one of the tools on this list, so read the rest with that in mind. Everything here is checkable against the vendors' own documentation, and where another tool is better than ours for a particular job, this post says so and explains why.
The short answer
If you want the one-line version: GNS3 if you want free, open source and no node limit. EVE-NG Pro if you are running a training lab on one server and will pay for it. Containerlab if your labs live in CI and you never want to see a GUI. Cisco CML if you are Cisco-only and your employer already pays. Packet Tracer if you are studying for a Cisco exam and have no images. And netplex. if you want real vendor firmware in a browser tab with nothing installed on the machine in front of you (it still needs its own x86-64 Linux server).
What actually separates these tools
Simulation or emulation. This is the biggest split and the one most buying guides skip. A simulator - such as Packet Tracer - reimplements device behaviour in its own code. It starts instantly and needs no vendor images, and it only knows the commands its authors wrote. An emulator - EVE-NG, GNS3, CML, Containerlab, netplex. - boots the vendor's real firmware on virtual hardware. It is slower and you must supply images, but the device behaves like the device. For exam drills, simulation is fine. For design work, it is not.
Where the images come from. Nobody legally redistributes Cisco IOS. Every emulator on this list expects you to bring your own, which is the real barrier to entry - not the software. If you cannot get images, a simulator or the free multi-vendor images (Arista cEOS, Nokia SR Linux, FRRouting, VyOS) are your realistic options.
What has to be installed on the machine you sit at. This one decides whether a lab spreads past the person who built it. GNS3 2.2 needs its desktop application, though GNS3 3.0 now has a browser UI too. EVE-NG has an HTML5 interface and HTML5 consoles, with an optional client pack for native telnet, VNC and Wireshark. Containerlab has a web GUI as well, which talks to a Linux lab host. If your laptop is locked down, how much you must install matters more than any feature list.
The tools, honestly
EVE-NG
A big template and image library, and a multi-user lab server: one Linux box, everyone connects to it, labs live centrally. Version 7.2 has an HTML5 UI and HTML5 consoles. The 2026 problem is the free tier: Community ended in June 2026, and Freemium allows 7 nodes per server for admin accounts only. Pro is 150 EUR per licence, up to 1,024 nodes per lab, and the licence is tied to one VM or computer. Mature and proven, and tighter for free than before. Full comparison.
GNS3
Free, open source, no node cap, a real API and one of the largest communities here. GNS3 3.0 is a stable release with a built-in browser UI, and 2.2 is still maintained. The classic setup is a desktop application talking to a separate GNS3 server or VM, which means more to install and keep in step. For a single engineer who wants maximum capability for zero pounds, it is still the strongest free option. Full comparison, or EVE-NG vs GNS3 head to head.
Containerlab
Excellent, and aimed squarely at automation engineers. Topologies are YAML, deployment is one command, and it fits CI pipelines better than anything else on this list. It also has a graphical editor (TopoViewer) in VS Code, as a desktop app and as a web GUI. It is open source. Real vendor VMs mean building vrnetlab images first, which is more work than a point-and-click import. Full comparison.
Cisco CML
Cisco's own product, with Cisco's own images included and legitimately licensed, which removes the single hardest problem in this whole category. There is a Free tier (5 nodes), Personal at $199 a year (20 nodes) and Plus at $349 a year (40 nodes). If you work in a Cisco shop, use it. It ships mostly Cisco images; third-party devices need your own node definition. Full comparison.
Cisco Packet Tracer
The right tool for CCNA fundamentals and nothing beyond them. Free with a Netacad account, instant, and it teaches the concepts properly. It simulates, so it stops keeping up the moment you type something outside the syllabus. Full comparison.
netplex.
Ours, so weigh it accordingly. Real vendor firmware under QEMU like EVE-NG and GNS3, but everything runs in the browser tab - canvas, consoles, packet capture - so the machine in front of you needs nothing installed (netplex itself needs an x86-64 Linux host or the appliance). No node cap on the free tier, though the free tier runs one lab at a time. It has a REST API, a CLI, a Python SDK and an MCP server (beta, 80+ tools, read-only below Architect). All comparisons.
How to choose in about a minute
Do you have vendor images? No, and you need Cisco specifically: Packet Tracer. No, but any vendor will do: any emulator, using free images like Arista cEOS, Nokia SR Linux, FRRouting or VyOS.
Is anyone else going to open this lab? No: GNS3, free and uncapped. Yes: something server-based - EVE-NG Pro, or netplex. if you want them to open it without installing anything.
Does the lab need to run unattended in CI? Containerlab, or anything with a real API.
Are you on a Mac, a Chromebook or a locked-down work laptop? Run the emulator on a Linux host and reach it through a browser. That rules out anything requiring desktop client software.
What changed this year
Three things worth knowing. EVE-NG ended its Community edition in June 2026 and now offers Freemium (7 nodes per server, admin accounts only). GNS3 3.0 became a stable release with a browser UI. EVE-NG Community is now end of life. And container-native network operating systems - SR Linux, cEOS, FRR - have improved enough that you can now build a credible multi-vendor routing lab without a single licensed image, which was not really true a few years ago.
If anything here is out of date or wrong, tell us and we will correct it. This page is reviewed as the products change, not written once and abandoned.