No. 2 of 34 ·Performance Testing Software

Fortio

Web · Windows · Mac · Linux · Self-hosted · API

Freedom report

Three barsScore 6.6

Free tierA free tier is on its own pricing page
Open codeNo open-source code on record
Runs widely4 of 6 device platforms
DocumentedPlans, terms and facts published

Fortio is ranked #2 of 34 in performance testing software on Freedom251. It runs on API, Linux, macOS, Self-hosted, Web, Windows. There is a free plan.

Fortio plans and pricing

All plans

Fortio Free open-source project · downloadable binaries · Docker image · self-hosted CLI, server and web UI fortio.org · 4 Oct 2026

Compared on performance testing software

Load testing: Yes
API testing: Yes
Deployment model: on-premise

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The record

Purpose: Fortio is an HTTP and gRPC load-testing library, command-line tool, echo server and web UI written in Go.
Load measurement: It runs at a specified queries-per-second rate and records latency histograms and percentiles such as p99.
Run modes: A load run can last for a set duration, a fixed number of calls, or until interrupted, at target QPS or maximum speed.
Results UI and API: The server includes a web UI and REST API for starting runs and viewing latency and comparative result graphs.
Protocol and debug features: Server features include request echo, probabilistic latency or error injection, TCP echo and proxy, HTTP fan-out proxy, and gRPC echo and health.
Libraries: Fortio is reusable and embeddable as a Go library, and components such as log, stats and fhttp can be used independently.
Tracing: Fortiotel is a Fortio variant with OpenTelemetry hooks and default options.
Related integration: Fortio Proxy can provide HTTPS with automatic TLS certificates and multiplex gRPC and regular HTTP services behind one port.
Install options: The project documents installation through Docker, Go install, platform binaries, Homebrew on macOS, and a Windows ZIP.
Architectures: The published Docker image supports linux/amd64, linux/arm64, linux/ppc64le and linux/s390x.
Open source: The maker describes Fortio as an open-source project and links to its source repository and releases.
Security reporting: The repository security policy asks users to open an issue or contact the main author to report a vulnerability.
Support and contributions: The maker directs users to the GitHub project to see examples, download releases, file issues, or contribute.
Notable requirement: Installing from source requires Go 1.18 or later.
Price from: Free

Where it ranks on Freedom251

Best Performance Testing Software in 2026#2 of 34

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Sources

fortio.org· checked 4 Oct 2026
fortio.org/fortiotel.html· checked 4 Oct 2026
fortio.org/proxy.html· checked 4 Oct 2026
github.com/fortio/fortio· checked 4 Oct 2026
github.com/fortio/fortio/blob/master/SECURITY.md· checked 4 Oct 2026