AI-Powered Load Testing for web apps

Create, execute, and validate browser and API load tests with AI agents. Built for SDETs and performance teams.

Start in minutes with JMeter, k6, Selenium, and Playwright scripts, no rewrites needed.

Trusted by more than 50,000 customers globally

Why Choose Load Testing on BrowserStack?

BrowserStack Load Testing cuts setup and maintenance overheads, generates real-world load at scale, and delivers unified frontend–backend performance insights for faster debugging.

Unified performance insights

• Correlate frontend and backend metrics in one view to pinpoint where performance breaks under load
• Overlay APM data to trace service and infrastructure issues
• Share trend, failure, and bottleneck reports to align teams

Real-user accuracy at massive scale

• Run browser load testing with thousands of browser VUs, far beyond what other tools allow
• Test with millions of API VUs to stay ready for your busiest day
• Run from a fully managed global cloud, no setup or upkeep

Framework-agnostic load testing

• Repurpose Selenium, Playwright, Nightwatch and WebdriverIO scripts for browser load testing without rewriting tests
• Reuse k6, JMeter, Gatling, and Locust scripts to start API load testing without framework changes
• Create load tests using a low-code recorder without scripting

AI agents across the workflow

• Turn natural language prompts into scripts, no scripting needed
• Run tests from your IDE via MCP, no context switching
• AI scans logs, flags anomalies, pinpoints root cause
• Migrate legacy load tests in minutes via AI migration agent

150+ seamless integrations and easy SDK setup

We work with the tools and frameworks you use. Seamlessly connect BrowserStack with your existing tools or get testing-ready in minutes with our SDK, no code changes required.

FAQs

What is load testing?

Load testing ensures your application can handle real-world traffic surges without crashing or slowing down. By simulating high volumes of concurrent virtual users, teams can catch performance bottlenecks, resource limits, and server stability issues before they affect production users.

Why do I need load testing if I’m already doing functional testing?

Functional testing only verifies that your application features work correctly for a single user. It does not test how the system behaves under pressure. Load testing ensures your backend endpoints, databases, and server infrastructure remain responsive and error-free when thousands of users access them simultaneously.

What is different about this load testing platform?

Our platform is an automated load testing solution that runs both protocol-level API tests and real-browser UI simulations at massive scale. It provisions fully managed cloud infrastructure across global locations, runs your test scripts, and consolidates performance logs into a single real-time dashboard.

How to get started with the load testing tool?

Getting started is straightforward. You can import existing API collections (Postman, Requestly, Bruno), repurpose standard open-source performance scripts (JMeter, K6, Locust, Gatling), or capture visual user journeys directly with our low-code recorder. Once loaded, you can scale up your traffic parameters from the UI or terminal.

Does the platform support testing across both APIs and real browsers?

Yes. You can execute high-concurrency backend stress tests using lightweight protocol engines to validate system throughput. Simultaneously, you can spin up real cloud browsers to measure actual user experience metrics, page layout rendering, and Core Web Vitals while your backend is under load.

What are the pricing options and plan limits?

We offer two main tiers: The Essentials plan provides foundational load generation for up to 100 browser users and 10,000 API users with a 2-hour maximum runtime. The Pro plan is designed for enterprise-level scaling, unlocking up to 1,000 browser users, 1 million API users, 8-hour continuous test durations, and advanced APM data integrations.