
Loadster
Loader.io
LoadForge
k6 Cloud
LoadUIWeb
LoadFocus
Loadium
LoadStorm
Testmunk
RainforestQA
TestMu AI (Formerly LambdaTest)
BrowserStack
Sauce Labs
Appium
Testkit
Testim
Loadster is a cloud-based load testing and synthetic monitoring platform for engineers who want to know how their applications behave under real traffic.
Tests run with three types of bots: Protocol Bots for HTTP testing, headless Browser Bots that render full pages and execute JavaScript in real Chrome browsers, and Playwright bots for when you want to use Playwright JS directly.
Loadster scripts can be recorded from Chrome or Firefox with the Loadster Recorder extension, edited in a built-in editor with variables, datasets, and shared includes, and then replayed from multiple cloud regions.
Each test run returns detailed page timings (TTFB, FCP, LCP, CLS, etc) alongside resource waterfalls, screenshots, and full traces you can step through in a self-hosted trace viewer. Tests scale from a handful of virtual users (bots) to hundreds of thousands across distributed cloud engines without you provisioning anything.
The same scripts can be set up as monitors that run on a schedule from chosen regions. Notification policies route incidents to email, SMS, voice, or integrations like Slack and PagerDuty. Projects, roles, and shared test history keep teams aligned on what passed, what failed, and what changed.
Pricing is usage-based via Loadster Fuel, with 50 free units on sign-up and no credit card to start.
Loadster
TestmunkLoader.io - Loader.io is a simple cloud-based load testing service
RainforestQA - Insanely simple testing. Create tests for your website in plain English, then run them across all major browsers with a single click. Powered by human intelligence
LoadForge - Better, cheaper load testing for websites, APIs and servers
TestMu AI (Formerly LambdaTest) - Worldโs first full-stack Agentic AI Quality Engineering platform.
k6 Cloud - Managed load testing service built on top of the popular open-source project k6.
BrowserStack - BrowserStack is a software testing platform for developers to comprehensively test websites and mobile applications for quality.