# Loadster

> Loadster is a commercial, self-hosted or vendor-hosted browser and real-user monitoring tool from Loadster, scripted in JavaScript.

- Canonical: https://perf.jmeter.ai/tools/loadster/
- Official: https://loadster.app/

- Vendor: Loadster
- Category: Browser/RUM
- License: Commercial — Free trial and paid plans.
- Deployment: Hybrid
- Status: Active
- Scripting: JavaScript
- Protocols: HTTP, HTTPS, WebSocket
- OS support: Windows, macOS, Linux
- First released: Not recorded

- Last verified: 2026-08-11

## What it is
Loadster provides a desktop and cloud workflow for creating traffic scenarios and running load tests. It targets web applications and API performance testing.

## Choose it when
- Browser/RUM scenarios across typical web and service stacks
- Organizations budgeting for commercial licenses or subscriptions
- Groups comfortable scripting in JavaScript

## Look elsewhere when
- Projects that require a fully free open-source stack only

## Architecture
Loadster is commonly operated as hybrid software with scenario authoring in JavaScript. Concurrency and distribution depend on how you size workers or injectors.

## Pricing
Loadster uses a usage-based 'Fuel' system. Options include monthly fuel plans (starting at $77/month) and pay-as-you-go fuel that does not expire. Custom and enterprise plans are available upon request.

## Compare

## FAQ
### Who is Loadster for?
Loadster is best for teams validating real-browser or end-user experience under load. It is commercial software, typically licensed for larger or governed programs. Vendor: Loadster. Deployment model: hybrid. Free trial and paid plans. Confirm details against the official site and a short proof-of-concept in your environment.

### How does Loadster differ from BrowserUp?
Compared with BrowserUp, scripting centers on JavaScript rather than Java, JavaScript. Loadster lists protocols HTTP, HTTPS, WebSocket; BrowserUp lists HTTP, HTTPS. Status is active versus active. Use the Test Rig to compare full specs side by side before a proof-of-concept.

### What scripting language and concurrency model does Loadster use?
Loadster uses JavaScript for scripting or scenario definition. Runtime model: code-first scenarios where virtual users execute scripted behavior under load. OS support: Windows, macOS, Linux. Protocols: HTTP, HTTPS, WebSocket. Match these to how your team already authors tests and which systems you must drive under load.

### What is the cloud or enterprise path for Loadster?
Loadster supports a hybrid path that can combine self-hosted controllers or agents with cloud or distributed load as the product allows. Teams often keep sensitive assets private while bursting generators into the cloud. Pricing model: Free trial and paid plans.

### What are known limitations of Loadster?
Loadster limitations to weigh: commercial licensing and quotes can gate large-scale or enterprise use. Status: active. Always validate against your target protocols and scale with a proof-of-concept. Confirm details against the official site and a short proof-of-concept in your environment.

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Curated by NaveenKumar Namachivayam (QAInsights) · methodology: https://perf.jmeter.ai/about/#methodology · corrections: https://github.com/QAInsights/Performance-Testing-Tools/issues/new?title=Tool%20submission%3A%20&body=Tool%20name%3A%20%0AOfficial%20URL%3A%20%0AWhat%20should%20be%20added%20or%20corrected%3F%20%0A