Best GNS3 Alternatives in 2026
Updated
20 apps from network testing software ranked against GNS3 on the same published basis.
- 1GNS3 vs LibreSpeed
- 2GNS3 vs PingPlotter
- 3GNS3 vs TRex
- 4GNS3 vs EVE-NG
- 6GNS3 vs Netperf
- 7GNS3 vs Netpicker
- 8GNS3 vs Cisco pyATS
- 9GNS3 vs Flent
- 10GNS3 vs iperf3
- 11GNS3 vs perfSONAR
- 12GNS3 vs OpenSpeedTest
- 13GNS3 vs iPerf2
- 14GNS3 vs M-Lab NDT
- 15GNS3 vs PacketForge
- 16GNS3 vs Batfish
- 17GNS3 vs Invariant
- 18GNS3 vs Mininet
- 19GNS3 vs MoonGen
- 20GNS3 vs Ostinato
- 21GNS3 vs PacketCheck
GNS3 alternatives compared
| # | App | Score | Free plan | From | Runs on |
|---|---|---|---|---|---|
| 1 | LibreSpeed | 6.7 | Free plan | Free | Android, Linux, Mac, self-hosted, Web, Windows |
| 2 | PingPlotter | 6.7 | Free plan | $29/mo | iOS, Linux, Mac, Web, Windows |
| 3 | TRex | 6.7 | Free plan | Free | API, Linux, Mac, self-hosted, Web, Windows |
| 4 | EVE-NG | 6.6 | Free plan | Free | Linux, Mac, self-hosted, Web, Windows |
| 6 | Netperf | 6.5 | Free plan | Free | Linux, Mac, Windows |
| 7 | Netpicker | 6.5 | Free plan | $625/mo | API, Linux, self-hosted, Web |
| 8 | Cisco pyATS | 6.4 | Free plan | Free | Linux, Mac, self-hosted |
| 9 | Flent | 6.4 | Free plan | Free | Linux, Mac |
| 10 | iperf3 | 6.4 | Free plan | Free | API, Linux, Mac, self-hosted |
| 11 | perfSONAR | 6.3 | Free plan | Free | API, Linux, self-hosted |
| 12 | OpenSpeedTest | 5.6 | Free plan | Free | Android, iOS, Linux, Mac, self-hosted, Web, Windows |
| 13 | iPerf2 | 5.4 | No | — | Windows, Mac, Linux, Android |
| 14 | M-Lab NDT | 5.3 | No | — | Web, Android |
| 15 | PacketForge | 5.3 | No | — | Web, Windows |
| 16 | Batfish | 5.2 | No | — | API, Linux, Mac, self-hosted, Windows |
| 17 | Invariant | 5.2 | Free plan | Free | API, Web |
| 18 | Mininet | 5.2 | No | — | API, Linux, Mac, self-hosted, Windows |
| 19 | MoonGen | 5.2 | No | — | Linux |
| 20 | Ostinato | 5.2 | No | $12/mo | API, Linux, Mac, self-hosted, Windows |
| 21 | PacketCheck | 5.2 | No | — | Windows |
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Questions about GNS3 alternatives
What is the best alternative to GNS3?
LibreSpeed, number 1 in network testing software with a score of 6.7 out of 10. The others here: PingPlotter, TRex, EVE-NG and 16 more.
What is the best free alternative to GNS3?
LibreSpeed is the best-ranked alternative with a free plan. 12 of the 20 alternatives here publish a free plan on their own pricing pages.
How are these alternatives ranked?
Ranked free-and-open first: a usable free tier and open-source code, then the platforms it runs on and its documentation.