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Loadster

Loadster

Browser/RUM Commercial Hybrid

MAINTAINED BY · Loadster, Inc., based in Phoenix, Arizona, United States.

Official site ↗
Pricing model
Free trial and paid plans.
First released
Not verified
Last verified
Answer

Loadster is a cloud-based SaaS platform used for load testing, stress testing, and site/API monitoring of websites and web applications. It enables users to detect performance bottlenecks and site outages by simulating traffic from global cloud regions or self-hosted engines.

About

Loadster is a cloud-based SaaS platform used for load testing, stress testing, and site/API monitoring of websites and web applications. It enables users to detect performance bottlenecks and site outages by simulating traffic from global cloud regions or self-hosted engines.

Best for

  • Browser/RUM scenarios across typical web and service stacks
  • Organizations budgeting for commercial licenses or subscriptions
  • Groups comfortable scripting in JavaScript

Not the best fit when

  • Projects that require a fully free open-source stack only

Architecture and concurrency

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

Features

  • Cloud-hybrid load testing (global cloud regions or self-hosted engines)
  • Site and API monitoring with active bots
  • Visual scripting for user flows
  • JavaScript-based Code Blocks for advanced logic and custom programming
  • Headless Chrome browser automation for user interaction simulations

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.

Specs

Scripting
JavaScript
Protocols
HTTPHTTPSWebSocket
Operating systems
WindowsmacOSLinux
Tags
browserapidesktop

Sources

SHOW SOURCES

LAST VERIFIED · 2026-08-11 · GROUNDED VIA EXA · CURATED BY NAVEENKUMAR NAMACHIVAYAM

Frequently asked

ANSWER-SHAPED
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.