Open Source · Free Forever

API Stress Testing
Made Simple.

One CLI command. Beautiful HTML reports with charts. No complex YAML. No configuration headaches.

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terminal — bash

$ go run . --url http://localhost:8080 --formats html

✓ Running stress test...

✓ 1,234 requests completed

✓ report.html generated

✨ Open report.html in your browser

See It In Action

Dark-themed reports with interactive charts, latency percentiles, and diagnostic insights — generated from a single CLI command.

GoStress Dashboard — Dark-themed load test report with charts and metrics

Built for Developers,
by a Developer

Everything you need for stress testing, nothing you don't.

Beautiful HTML Reports

Interactive charts for latency, reliability, status codes, and transport errors. Visual insights, not just numbers.

One Simple Command

No complex YAML. No configuration files. Just intuitive flags that make sense from the first run.

Built-in Web Dashboard

Launch a protected web UI to view and share reports. Perfect for teams and CI/CD pipelines.

Global RPS Limiting

Cap your request rate across all workers. Control your load with precision and safety.

Custom Success Status

Define exactly which HTTP status codes count as success. Perfect for APIs with custom error codes.

Open Source & Free

Completely free to use, modify, and distribute. Built with Go, open for contributions.

⚡ Quick Start

Run your first stress test in under 30 seconds

                    # Basic test — 10 concurrent users, 10 seconds

                    go run . --url http://localhost:8080 --formats html

                    # Advanced — POST with payload, RPS cap, and custom success codes

                    go run . --url http://localhost:8080/api/orders --c 50 --d 30 --method POST --payload '{"customerId":123}' --headers 'Authorization: Bearer token' --success-status '200-299,409' --rps 200 --formats json,csv,html

                    # Launch the dashboard

                    go run . --serve-web --web-addr :8088 --dashboard-report report.json

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From the Blog

Updates, guides, and deep dives from the GoStress team.

Release

Introducing Concurrency Ramp-Up

GoStress now supports ramping from 1 to N workers over a configurable duration. Learn why gradual concurrency matters and how to use the new --ramp flag to uncover saturation points without overwhelming your target.

Aug 26, 2026 5 min read