cassowary ☆

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Description:
Modern cross-platform HTTP load-testing tool written in Go

Type: Formula | Latest Version: 0.19.0@0 | Tracked Since: Dec 17, 2025

Links: Homepage | formulae.brew.sh

Category: Developer tools

Tags: http load-testing benchmarking go devops performance

Install: brew install cassowary

About:
Cassowary is a modern HTTP load testing tool written in Go, designed to be a simple yet powerful alternative to Apache Bench. It provides detailed performance metrics and supports modern HTTP features like HTTP/2 and custom headers, making it ideal for benchmarking web services and APIs.

Key Features:

Supports HTTP/2 and custom headers
Detailed latency and throughput metrics
Cross-platform binary distribution
Simple command-line interface
CSV export for results analysis

Use Cases:

Benchmarking API endpoints under concurrent load
Comparing performance of web servers or application versions
Load testing during development and CI/CD pipelines

Alternatives:

wrk – wrk is highly optimized but requires Lua scripting for complex scenarios, whereas Cassowary offers a simpler CLI.
ab (Apache Bench) – ab is a classic tool but lacks HTTP/2 support and modern features that Cassowary provides.

License: MIT

Bottles available for: arm64_tahoe, arm64_sequoia, arm64_sonoma, arm64_ventura, sonoma, ventura, arm64_linux, x86_64_linux

Version History

Detected	Version	Rev	Change	Commit
Oct 10, 2025 3:00am		0	VERSION_BUMP	7e59e287
Sep 13, 2025 4:27am		0	VERSION_BUMP	b247d607