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Fortio

fortio.org

Free plan WebWindowsmacOSLinuxAPISelf-hosted
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Spec score 8.2 #12 of 38 in Performance Testing Software

What it is

Fortio is a free, open-source Go project for HTTP and gRPC load testing. It combines a load-testing library, command-line tool, echo server, and web interface, with API, Linux, macOS, self-hosted, web, and Windows platforms. A run can target a specified queries-per-second rate or maximum speed, and can stop after a duration, a fixed call count, or interruption. Fortio records latency histograms and percentiles such as p99. Its server offers a web UI and REST API for starting tests and viewing latency and comparison graphs. Additional server functions include request echo, probabilistic latency or error injection, TCP echo and proxy, HTTP fan-out proxy, and gRPC echo and health. Go applications can embed Fortio or use its log, stats, and fhttp components separately. Fortiotel adds OpenTelemetry hooks. Fortio Proxy can provide HTTPS with automatic certificates and multiplex gRPC and HTTP behind one port. Installation options include Docker, Go, binaries, Homebrew, and a Windows ZIP.

Spec sheet

Purpose
Fortio is an HTTP and gRPC load-testing library, command-line tool, echo server and web UI written in Go.Read 4 Oct 2026 · fortio.org
Architectures
The published Docker image supports linux/amd64, linux/arm64, linux/ppc64le and linux/s390x.Read 4 Oct 2026 · github.com
Install options
The project documents installation through Docker, Go install, platform binaries, Homebrew on macOS, and a Windows ZIP.Read 4 Oct 2026 · github.com
Libraries
Fortio is reusable and embeddable as a Go library, and components such as log, stats and fhttp can be used independently.Read 4 Oct 2026 · fortio.org
Load measurement
It runs at a specified queries-per-second rate and records latency histograms and percentiles such as p99.Read 4 Oct 2026 · fortio.org
Notable requirement
Installing from source requires Go 1.18 or later.Read 4 Oct 2026 · github.com
Open source
The maker describes Fortio as an open-source project and links to its source repository and releases.Read 4 Oct 2026 · fortio.org
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.Read 4 Oct 2026 · fortio.org
Related integration
Fortio Proxy can provide HTTPS with automatic TLS certificates and multiplex gRPC and regular HTTP services behind one port.Read 4 Oct 2026 · fortio.org
Results UI and API
The server includes a web UI and REST API for starting runs and viewing latency and comparative result graphs.Read 4 Oct 2026 · fortio.org
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.Read 4 Oct 2026 · fortio.org
Security reporting
The repository security policy asks users to open an issue or contact the main author to report a vulnerability.Read 4 Oct 2026 · github.com
Support and contributions
The maker directs users to the GitHub project to see examples, download releases, file issues, or contribute.Read 4 Oct 2026 · fortio.org
Tracing
Fortiotel is a Fortio variant with OpenTelemetry hooks and default options.Read 4 Oct 2026 · fortio.org

Plans and prices

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

Every Fortio plan and price →

Strong points and limits

Strong points

  • Free open-source project with downloadable binaries
  • Measures latency histograms and p99 percentiles
  • Web UI and REST API for test runs
  • Supports HTTP, gRPC, TCP, and proxy features
  • Docker image supports four listed architectures

Limits

  • Source installation requires Go 1.18 or later
  • No free trial because the project is already free

Who it suits

Fortio suits developers and operators who need self-hosted HTTP or gRPC load and API testing. It also fits Go teams wanting embeddable libraries or independently reusable components.

Verdict

Fortio combines load generation, measurement, protocol helpers, and a results interface in a self-hosted package. Its broad installation options and Go components suit teams that want configurable tooling without licensing fees.

Where Specifiction places it

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