Flent

7.0easy start · #8 of 31
in Network Testing Software

Runs on Linux, Mac.

Flent is ranked #8 of 31 in network testing software on The Geeks Club. It runs on Linux, macOS. There is a free plan.

Flent plans and pricing

Flent Free No paid plans or usage limits stated on the opened pages flent.org · 4 Oct 2026

PingPlotter 0 of 4 in the starter kit Lesson 18.0 OpenSpeedTest 0 of 4 in the starter kit Lesson 27.5 TRex 0 of 4 in the starter kit Lesson 37.5 LibreSpeed 0 of 4 in the starter kit Lesson 47.4 EVE-NG 0 of 4 in the starter kit Lesson 57.3 Cisco pyATS 0 of 4 in the starter kit Lesson 67.1

Purpose: Flent wraps netperf and similar tools to run predefined network tests, aggregate results, and plot them, primarily to test for bufferbloat.
Repeatable tests: It combines benchmarking tools into aggregate, repeatable test runs.
Data capture: It can capture metadata from local and remote hosts and store it with plot data.
Additional measurements: It can collect CPU usage, WiFi, qdisc, and TCP socket statistics as secondary data series.
Automation: Batch experiment runs can automate testing regimes.
Outputs: Aggregated results can be saved as gzipped JSON or output as CSV, Org tables, and plots.
Plot formats: Plots can be saved in formats supported by matplotlib, including PNG, PS, PDF, and SVG.
Tools and dependencies: Most tests use netperf 2.6 or later, while some use iperf; both tools must be available in PATH for the tests that use them.
UDP measurements: The documentation recommends irtt for UDP measurements and says its server must run on target hosts.
Desktop GUI: An interactive plot viewer is available, and the macOS installation instructions list PyQt5 and qtpy as optional GUI dependencies.
Supported installs: The site lists installation options for Linux distributions, FreeBSD, and macOS.
Intended users: The project describes Flent as a tool for making network experiments more reliable and easier to perform.
Price from: Free

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