Your site has a breaking point.

Let's find it before your users do.

Don't crash under peak traffic! Load test your web application with thousands of synthetic users to optimize performance, control costs, and prevent downtime.

Start testing for free

A universal load testing platform

for all things HTTP

  • Unbreakable APIs

    Use Loadster's datasets, validators, and capturers to load test your API with dynamic requests.

    Test any kind of HTTP API, including REST, GraphQL, JSON-RPC, & XML-RPC.

    If you use OpenAPI/Swagger, Loadster's scripting interface can create steps directly from the API specification.

  • Bulletproof Web Apps

    Loadster handles cookies automatically, and you can submit dynamic data with each request by binding to a CSV dataset.

    Add advanced validation rules to detect errors or anomalies, and capture values from responses to reuse later.

    For looping and conditional logic, write your own JavaScript code blocks.

  • Indestructible Static Sites

    Record scripts with the free Loadster Recorder browser extension.

    Play them back with thousands of concurrent users from any of 24 cloud regions across the globe.

    With Loadster's cloud testing platform, you’ll save time and money by spinning up fully managed instances with zero setup.


the performance feedback loop

  • Rapidly create your test scripts

    Record load test scripts right 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 to perfection with Loadster's interactive script editor.

    It's simple to add custom validation and capture server responses to reuse later in the script. Not powerful enough for you? Try JavaScript Code Blocks for advanced control flow, looping, and conditionals.

  • Launch distributed cloud tests in seconds

    Configure your test scenario with groups of v-users 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 v-users across hundreds of cloud instances in regions of your choosing.

  • Analyze results with rapid reporting

    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.

Load testing for web apps

built to move fast

  • Speedy script recording

    Speedy script recording

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

  • Browser based editing

    Browser based editing

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

  • Rapid script feedback

    Rapid script feedback

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

  • Detailed diagnostics

    Detailed diagnostics

    After your script runs, view the full HTTP request and response from every step, both headers and body.

  • Fully managed cloud

    Fully managed cloud

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

  • Live stream test results

    Live stream test results

    As a test runs, watch 10+ charts in real time. Monitor response times, throughput, errors, and more.

  • Automatic test reports

    Automatic test reports

    Loadster generates a full test report with charts and tables after every test. No more manual reporting!

  • Team collaboration

    Team collaboration

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

Test from 24 cloud regions,

or your own self-hosted engines

In about 90 seconds, Loadster can launch fully managed load engines in 24 data centers all over the world.

Need to test on premises? No problem! Self-hosted load engines are included at no extra charge.

Loadster world coverage

Flexible pricing

to fit your testing frequency

  • Loadster Fuel

    Pay as you go, from $119 per 1000 v-user hours

    Buy fuel and run load tests, from any cloud region or your self-hosted engines. No commitment. Simply purchase more fuel when you run out!

    View Loadster Fuel Pricing
  • Unlimited Plans

    All the tests you want, from $299 a month

    Run unlimited load tests each month, from the public cloud or your own self-hosted engines! Easy budgeting, generous usage limits, and no billing surprises. Great for teams.

    View Unlimited Plan Pricing

Move fast
don’t crash

Ready to reduce the risk of site crashes?
Load testing gives you the confidence your site can handle it.

Start testing for free

Loadster is proud to be of service

to some pretty awesome people

  • Our customer Harvard University
  • Our customer Wells Fargo
  • Our customer Infusion Soft
  • Our customer Queensland Government
  • Our customer Jet.
  • Our customer Meltmedia
  • Our customer State of Georgia
  • Our customer Carus
  • Our customer Yale University
  • Our customer Pearson
  • Our customer Score Big
  • Our customer Perficient
  • Our customer Craigs Investment customers
  • Our customer Accruent
  • Our customer The University Of Queensland
  • Our customer APT a Mastercard Company
  • Our customer Jazzercise.
  • Our customer NGINX