PerfLoad / k6 alternative
A k6 Alternative for Going From a Request to a Load Test Faster
k6 is a capable, developer-focused load testing tool, and if your team writes and reviews load tests as code, it is often the right choice. PerfLoad is aimed at a narrower job: reducing the setup needed for common API load tests, so you can go from an existing request to a result quickly. It also runs k6 underneath, so this is less “either/or” than it sounds.
Try PerfLoad →Runs in Docker — one command, and the Workbench is at http://localhost:3000/load-tester.html.
Two workflows, side by side
Traditional k6 workflow
- Write / configure test
- Execute
- Analyze
PerfLoad workflow
- Paste curl
- Configure
- Execute
- Analyze
- Save
- Rerun
The difference is where you start. With k6 you begin from a script; with PerfLoad you begin from a request and a form. Everything after “execute” is k6 in both cases.
How they compare
| k6 directly | PerfLoad | |
|---|---|---|
| Starting point | A JavaScript test script | A curl command, or the Dashboard form |
| Load configuration | options and scenarios in code | Users, duration, ramp-up, and pause in the UI |
| Custom logic | Full JavaScript: multi-step flows, custom checks, thresholds, extensions | Variables, auth, and response validation; no custom code |
| Live view | Terminal output, plus k6's web dashboard and outputs you configure | Live results and latency chart in the UI, and a link to k6's live dashboard |
| Keeping results | Whatever you set up: files, an output backend, CI logs | Run history that persists in a Docker volume, with side-by-side compare and PDF reports |
| Rerunning | Re-execute the script from version control | Load a saved run's config and run again, overriding users or duration if you want |
| Suited to | Engineers who write and review test code | Developers, QA/QE, and DevOps engineers who'd rather not maintain a script for a simple test |
When to choose k6 directly
- Your load tests need real logic: multi-step flows, conditional behavior, or custom metrics.
- You want tests reviewed and versioned like application code, with thresholds that fail a build.
- You need protocols or extensions beyond plain HTTP requests.
- You're already invested in a k6 setup, including how you collect and view results.
When PerfLoad is the quicker route
- The request already exists as curl — from a bug report, DevTools, or API docs — and you want to know how it behaves under concurrency today.
- Teammates who don't write JavaScript need to run and rerun load tests, and a GUI load testing workflow (the Workbench and Dashboard) fits how they work.
- You want run history, comparisons, and reports without assembling them yourself.
- You want a pipeline to replay a saved test with a few
curlandjqcommands — see CI/CD load testing.
Using both
These aren't exclusive. One reasonable split is PerfLoad for the fast, repeatable single-endpoint checks that anyone on the team can run, and hand-written k6 for the scenarios that need code. If you're curious about the bridge between them, curl to k6 explains how a request becomes a k6 test.
FAQ
Is PerfLoad a fork of k6?
No. PerfLoad runs the standard k6 binary for each test and reads its summary output. The value it adds is the workflow around it: request-to-test conversion, a UI, history, and an API.
Will I hit a wall with PerfLoad?
Possibly, if your tests need scripted logic. PerfLoad is built for HTTP request tests, and when you need more than that, k6 scripts are the natural next step.
Can a team's scripted k6 tests and PerfLoad coexist?
Yes. They answer different questions and don't depend on each other.
Related guides
See whether the shorter path fits
Take one request you'd normally script and run it through PerfLoad.
Try PerfLoad →