AI Load Testing
Load test faster with help from your AI assistant. Connect Claude, ChatGPT, or Cursor to your Loadster account. Your trusted agent writes the scripts, builds the test scenario, and interprets the results.
Accelerate your load testing with a little help from AI. Scripting and test setup is now just a quick chat session.
I'll build this as a Browser Bot script so it drives real Chrome the way a shopper would. Let me read Loadster's browser scripting docs first, then create the script and play it once before handing it over.
The first play got through search and add-to-cart but failed at checkout: the "Continue as guest" button never became clickable. The screenshot shows a cookie banner sitting on top of it, so I'll add a step to dismiss the banner and play it again.
That fixed it. All 7 steps pass in about 9 seconds, and the confirmation page renders with an order number. The script is saved in your Staging project: Guest Checkout ↗. Want me to add a dataset of shipping addresses so each bot checks out with different details?
Done. I created a dataset with 250 shipping addresses, wired it into the checkout step, and re-played the script to confirm it still passes.
The scenario is built:
- 500 Browser Bots from N. America - Virginia, 500 from Europe - United Kingdom
- Ramp to 1,000 in 60 seconds, hold for 5 minutes, then ramp down over 30 seconds
Launching it is your call, since a test this size runs unattended and burns fuel. It's ready here: Guest checkout 1000 browsers ↗. Press Launch whenever you're ready, and I'll pull the report and tell you where it strained once it finishes.
Loadster MCP makes your AI agent almost as powerful as you are. Enlist your agent to write and play scripts, build datasets, configure load tests, and analyze results.
Loadster's MCP server gives your agent access to scripts, datasets, scenarios, reports, and monitors. Agents can't launch or stop full load tests, enable monitors, manage notification policies or maintenance windows, or administer your team, billing, or Fuel. MCP changes affect the same project data your teammates see, so review proposed changes just as you would in the dashboard.
| Capability | Your AI agent | You |
|---|---|---|
| Scripting | ||
| Write and edit Protocol Bot, Browser Bot, and Playwright scripts | ✓ | ✓ |
| Import an existing JMeter, k6, or Locust test | ✓ | ✓ |
| Record a script with the browser extension | – | ✓ |
| Validate a script and play it as a single bot | ✓ | ✓ |
| Inspect step results, response bodies, and screenshots | ✓ | ✓ |
| Roll back to an earlier script revision | ✓ | ✓ |
| Datasets and scenarios | ||
| Create and fill datasets | ✓ | ✓ |
| Build scenarios with populations, ramps, and regions | ✓ | ✓ |
| Load tests | ||
| Launch a load test | – | ✓ |
| Stop a running load test | – | ✓ |
| Read the test report and explain what happened | ✓ | ✓ |
| Add notes to a test report | ✓ | ✓ |
| Monitoring | ||
| Create and configure monitors | ✓ | ✓ |
| Enable a monitor | – | ✓ |
| Disable a monitor | ✓ | ✓ |
| Investigate incidents and monitor cycles | ✓ | ✓ |
| Notification policies and maintenance windows | – | ✓ |
| Account | ||
| Team members, billing, and fuel | – | ✓ |
Automate real headless Chrome browsers or lightweight HTTP clients. AI-assisted scripting with your choice of Playwright, Browser Bots, or Protocol Bots.
Browser Bots
Record scripts in your browser with Loadster's free extension and edit them visually. Add JavaScript if necessary. Browser Bots automate real headless Chrome browsers for realistic web application testing with a minimal learning curve.
4X
Protocol Bots
Protocol Bots execute scripted HTTP/S requests against your API or static website. Testing at the protocol layer is cost-effective and easily scales to hundreds of thousands of concurrent bots, and is ideal for testing HTTP APIs at scale.
1X
Playwright
Run your Playwright Test scripts at scale through Loadster's cloud. Ideal for teams already using Playwright or who want programmatic control with an open source testing framework, combined with Loadster's cloud scaling and reporting.
4X
Bring your own trusted agent. Loadster MCP unlocks load testing with Claude, ChatGPT, Cursor, and more.
Loadster uses MCP (Model Context Protocol), an open standard for connecting AI assistants to external tools. Clients with OAuth support can send you to Loadster to approve the connection in your browser, with no token to copy. Clients without OAuth, along with CI jobs and scripted agents, can use a static token you generate in the dashboard instead.
Once connected, your AI assistant acts on your behalf in Loadster, and you can see and revoke its access anytime on the AI Agents page in your Loadster settings. The AI Agents manual page has steps for setting up ChatGPT web, Codex desktop and CLI, Claude Code, Cursor, VS Code, Claude Desktop, and other MCP clients.
Load testing results without the endless configuration. Loadster's cloud testing platform helps you move faster: browser-based script recording, live test metrics, automatic reports.
Record test scripts
Record load test scripts right in your browser with the Loadster Recorder extension for Chrome or Firefox. Just navigate your site like a real user, while Loadster automatically records every action into a reusable test script.
Edit and replay scripts
Play scripts as often as you like in Loadster's script editor. Bots execute your script and give you immediate real-time feedback. In the editor you can add, edit, and replace steps from the recording, or you can even build a script from scratch.
Configure test scenarios
A scenario is a reusable configuration for a load test. You'll specify the number of bots in each group, the AWS or GCP regions bots will run from, which of your scripts to execute, and the schedule for ramping the load up and down.
Launch your load test
When you launch a load test from a scenario, Loadster quickly spins up cloud resources to power your bots. Tests usually start in about 2-3 minutes, using fully managed infrastructure through Loadster's AWS and GCP cloud providers.
Observe real-time results
While a load test runs, your bots report real-time metrics to Loadster, and Loadster surfaces the latest details and diagnostics within seconds. Keep tabs on response times, throughput, errors, and detailed traces so you can see how your site is performing under load.
Generate test reports
After a load test finishes, Loadster automatically creates a detailed report so you can review your site's performance and scalability. This includes detailed graphs showing response times, errors, network and transaction throughput, and more. The report also includes detailed traces with request and response bodies or screenshots to help with troubleshooting.
Repeat and iterate
Load testing is an iterative process, and it's rare that everything goes perfectly on the very first try. After all, the point of the test is to discover scalability bottlenecks so you can fix them instead of crashing in production. With Loadster you can quickly re-test a previous scenario, or make changes to your scripts or scenarios and run again at any time.
Run load tests on demand from 32 AWS and GCP cloud regions. Monitor continuously from 8 locations across 5 continents.
Loadster scales with your testing and your budget. Choose between flexible pay-as-you-go and predictable subscription pricing.
Monthly Fuel Plans
Starting at $77 a month
Subscribe to a monthly plan to automatically add fuel every month at a discount. Unused fuel rolls over as long as you keep the plan.
Check Plan PricingPay As You Go
Starting at $97 for 1000 units
Purchase as much Loadster Fuel as you need for your load testing and monitoring. No commitment, just buy it when you need it.
Check Fuel PricingFrequently Asked Questions
Can I load test with an AI assistant like Claude, ChatGPT, or Cursor?
What is the Loadster MCP server?
Which AI assistants can connect to Loadster?
Can the AI actually launch a load test?
Do I need to know scripting to load test with AI?
Loadster has optimized the performance, scalability, and uptime of thousands of sites. We're proud to be a testing platform of choice to elite teams.
Move fast
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Ready to cut your risk of downtime? Load test to prevent crashes. Monitor to react quickly.