Your site has a breaking point. Load test to find it before your users do.

Don't crash in a traffic spike! Load test your site with thousands of bots to detect bottlenecks, improve performance, and prevent downtime.

Launch thousands of headless Chrome browsers or multithreaded HTTP clients in minutes.

Browser Bots control real headless Chrome browsers, for the most realistic load testing possible. Automating thousands of real browsers is the ideal way to stress test your web apps and modern websites.

Best For

Web Applications, Modern Websites

Fuel Consumption

Protocol Bots execute scripted HTTP/S requests against your API or static website. Testing at the protocol layer is cost-effective and scales to hundreds of thousands of bots.

Best For

APIs, Simple Websites

Fuel Consumption

Prevent crashes and downtime by testing peak traffic conditions.

Every website, web application, and API has its breaking point. Yours might be fast and stable most of the time, only to crash under heavy traffic.

A flood of traffic to your site is a welcome opportunity if the site can handle it. But if it crashes or gets unusably slow, you'll waste the extra traffic and damage your reputation.

Load testing (or stress testing) is the technique of realistically simulating heavy traffic conditions ahead of time, to prepare for heavy traffic and reduce your risk of site failure.

Start testing for free

With Loadster, you'll be running your first load test and getting actionable results in minutes (in most cases).

Ready to give it a try? Create a free account or read our short Introduction to Load Testing for a little more background.

Realistic scripting, distributed load testing, and actionable results in minutes.

Create realistic test scripts in your browser.

Record load test scripts in your browser with the Loadster Recorder extension for Chrome or Firefox. Just step through your site like a real user would while Loadster records every step into a script. After recording, play your script back in real time, and edit it as necessary.

Launch geo-distributed load tests on demand.

Configure your test scenario with groups of bots in regions of your choosing, running your scripts, ramping the load up and down, to simulate the geographically distributed traffic you see in the real world.

Loadster's got what you need to run globally distributed cloud tests with minimal setup. No need to deploy your own instances to run test infrastructure! In about 90 seconds, Loadster can launch tens of thousands of bots across hundreds of cloud instances in regions of your choosing.

Analyze load test results with detailed reports.

While a load test runs, Loadster gives you realtime metrics on response times (average and percentile), network and transaction throughput, errors, and more.

After it finishes, the same data is instantly available in a test report you can hold on to or share with your team.

The metrics and report data inform you how your site handled the traffic, what kind of performance your real users can expect when the site's under a similar amount of load, and where the hot spots and bottlenecks might be.

Loadster has the tools you need to move faster with your load testing.

Speedy script recording

Record scripts right in your browser with the free Chrome or Firefox extension. Or add steps manually.
Browser-based editing

Add steps, edit them, and tweak your script to perfection. All in your web browser.
Rapid script feedback

Play scripts from your web browser, and watch in real time as each step runs. Repeat as necessary!
Detailed diagnostics

After your script runs, you'll see requests, responses, screenshots, and errors from every step.
Fully managed cloud

No need install any infrastructure! Loadster spins up fully managed cloud instances in about 90sec.
Live test results

As a test runs, watch the charts in real time. Monitor response times, throughput, errors, and more.
Automatic test reports

Loadster generates a full test report with charts and tables after every test. No tedious manual reporting.
Team collaboration

Anyone on your team can create scripts, run tests, and share results. Make scalability a team effort!