Open-source tool for testing internet speed and connection quality.
Best iperf3 Alternatives ranked by AI · updated Aug 2026
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iperf3 is an open-source command-line tool for measuring network throughput between client and server endpoints. It is widely used by network administrators and developers for testing TCP, UDP, and SCTP performance.
Top 6 iperf3 alternatives
LAN Speed Test measures file-transfer performance across local networks and storage locations using a graphical interface. It is intended for Windows and...
Pros
- More user-friendly than NetStress for file-transfer checks
- Tests practical read and write performance to network shares
- Supports Windows and macOS
Cons
- File-transfer results are affected by disk and share performance
- Less precise for isolated network-layer testing than iPerf3
- The free version has fewer features than the paid edition
Free Lite; paid from $10
TamoSoft Throughput Test is a graphical network performance utility that measures TCP and UDP throughput, packet loss, and related connection statistics. It...
Pros
- Provides a graphical alternative to command-line tools
- Measures TCP and UDP traffic with packet-loss information
- Useful for testing wireless and VPN connections
Cons
- Less widely used and documented than iPerf3
- Platform support is narrower than iPerf3
- Interface and workflow are less modern than newer tools
NetIO-GUI is a graphical front end for the NetIO network throughput benchmark, aimed primarily at Windows users testing LAN and network performance....
Pros
- Provides a simpler Windows interface than command-line NetIO
- Useful for basic client-server LAN throughput tests
- Lightweight and free to use
Cons
- Fewer protocol and measurement options than iPerf3
- Less actively maintained than modern network benchmark tools
- Primarily suited to Windows rather than cross-platform workflows
5
Flent
Toke Høiland-Jørgensen and contributors
Flent is an open-source network benchmarking front end for running repeatable tests and visualizing their results. It is aimed at network engineers...
Pros
- Combines multiple network test tools into repeatable benchmark scenarios
- Produces clear plots for latency, throughput, and bufferbloat analysis
- Supports batch testing and automated result comparison
Cons
- Requires command-line networking tools and configuration knowledge
- Less convenient for one-off connectivity checks than Speedtest
- Has a steeper setup and learning curve than iperf3
Free, open source
Netperf is a benchmark that can be used to measure the performance of many different types of networking. It provides a number...
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