Fortio vs Speedscale

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.

Speedscale is a hybrid API and load-testing product that uses captured production traffic to test changes in Kubernetes. It can replay requests, create service virtualizations that mimic flaky or third-party dependencies, and generate load tests from captured traffic. Load tests track latency and throughput against budgets; the product supports stress testing and distributed load. Listed pipeline integrations include GitHub, GitLab, Jenkins, Azure DevOps, Google Cloud Deploy, AWS CodeBuild, Bitbucket Pipelines, TeamCity, and CircleCI. Other listed integrations include GitHub Actions, k6, and Postman. The full stack can run inside a customer’s AWS, GCP, or Azure account, keeping traffic within that VPC. Speedscale offers tools to redact sensitive data and says leaked sensitive data can be deleted retroactively. The company says it completed an AICPA SOC 2 Type I audit. Its free proxymock tool provides unlimited local mocking, basic traffic recording, and a desktop CLI for local development. Proxymock has native command-line options for macOS, Linux, and Windows.