Siege
Siege: Open Source Load Testing and Benchmarking Utility
Test web applications stability and performance under heavy load with Siege, an open source tool for load testing and benchmarking.
What is Siege?
Siege is an open source load testing and benchmarking utility designed specifically to test web applications. It allows developers to simulate a large number of concurrent users accessing a web application to test its performance and stability under heavy load.
Some key features of Siege include:
- Ability to simulate hundreds or thousands of concurrent users from a single machine
- Flexible configuration of user scenarios and access patterns
- Text-based output for statistics like response times, transaction rates, concurrence levels, and response status
- Authentication support with GET, POST, Basic Auth, Cookies, etc.
- SSL/TLS support
- Customizable HTTP header values
- Docker support for easier cloud deployments
- Scriptable using command files for automated tests
Siege is often used for capacity planning, benchmarking against alternative solutions, analyzing application bottlenecks, and monitoring web application performance over time. It is free and open source, available for Linux, Solaris, and macOS platforms.
Siege Features
Features
- Load testing
- Stress testing
- Benchmarking
- HTTP/HTTPS protocol support
- Authentication support
- Concurrent virtual users
- Customizable test scenarios
- Command line interface
- Detailed performance metrics
Pricing
- Open Source
Pros
Cons
Official Links
Reviews & Ratings
Login to Review3 reviews
Rating Breakdown
Recent Reviews
Dakota White
Apr 30, 2026A Developer's Go-To for Simple, Effective Load Testing
Siege has been a fantastic tool for quickly stress-testing our web APIs during development. The command-line interface is straightforward, and being able to simulate hundreds of concurrent users with a single command has helped us catch performance bottlenecks early. The …
Olivia Chen
Apr 28, 2026Essential Tool for Stress Testing Web Apps
Siege has been a game-changer for our DevOps pipeline. Its command-line interface is straightforward, allowing us to quickly simulate hundreds of concurrent users and identify bottlenecks before deployment. The detailed performance reports it generates are incredibly useful for pinpointing issues. …
Olivia Harris
Mar 09, 2026Simple Yet Powerful Load Testing for Developers
Siege has become my go-to tool for quick performance checks on our web APIs. The command-line interface is straightforward once you learn the basic flags, and it gives me immediate insight into how our services handle concurrent requests. Being open …
Rating Distribution
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