LibreSpeed

LibreSpeed is a lightweight, open-source internet speed test implemented in JavaScript for modern browsers. It provides an embeddable, self-hosted HTML frontend that performs download, upload, ping and jitter measurements and can optionally store results and telemetry on a backend server.

Key Features

• Browser-based speed tests using XMLHttpRequest and Web Workers for parallel transfers and measurement accuracy.
• Measures download throughput, upload throughput, ping and jitter; can optionally show ISP and approximate location.
• Multiple backend options (PHP is the primary backend; additional backends and implementations exist) and optional database storage for results (MariaDB/MySQL, PostgreSQL, SQLite supported).
• Official Docker image and Dockerfile for easy deployment and regular updates.

Use Cases

• Deploy a private speed-test endpoint for internal network monitoring and SLA validation.
• Provide a public community speed-test instance for an ISP, campus, or hosting provider to show real-world throughput and latency.
• Integrate periodic speed checks into infrastructure monitoring workflows (store results in a database and ingest into dashboards).

Limitations and Considerations

• Node.js backend: a partial Node.js implementation exists but is marked "not recommended" in the repository; PHP remains the primary backend.
• High-throughput tests can be limited by server/hosting TLS termination or proxy configuration; community reports indicate HTTPS/proxy setups may reduce measured throughput compared to direct HTTP in some environments. Evaluate TLS offloading and proxy performance if you need gigabit-level results.

LibreSpeed is a pragmatic, minimal dependency speed-test you can run on your own infrastructure to measure throughput and latency without third-party telemetry. It is actively maintained with releases and a Docker image for straightforward deployment, and supports multiple storage backends for result retention and analysis.