OpenSpeedTest

OpenSpeedTest is a free HTML5 tool for measuring internet and local-network performance in a browser. It best suits people checking home or office connections and teams measuring infrastructure they control. Its appeal is the combination of configurable tests, an embeddable widget and self-hosting; Firefox is a poor fit for longer stress tests and speeds above 2.5 Gbps.

Overview

OpenSpeedTest measures sustained download and upload speeds, latency, jitter and connection stability. The test runs without an app, plugin, Flash or Java installation, making it practical when people need to run a check on their own devices. The maker says its adaptive test supports connections from 1 Mbps to 10 Gbps and beyond.

A responsive widget can be embedded in a website or app, and a URL parameter can start it automatically. That suits a support page or internal tool offering a quick connection check. Teams can instead deploy the test themselves using Docker images or source code, for environments ranging from home networks to enterprise infrastructure.

Key features

Configurable tests: URL parameters can launch tests, run continuous stress tests, select download, upload or ping, and set ping samples or parallel connections. This is useful for repeatable checks, though Firefox is not recommended for stress tests longer than 10 minutes or speeds above 2.5 Gbps.

Embedding: The widget is free for personal and commercial use. Automatic starts via URL parameters make it easier to incorporate a test into an existing site or app without requiring a separate app installation.

Self-hosting: Docker deployment and source code allow teams to run the test on infrastructure they control. The setup guide calls for a public IPv4 or IPv6 address, a domain resolving to the server, and an email address for its Let's Encrypt setup. The Docker application is described as static HTML, CSS and JavaScript files, with instructions for enabling SSL.

Protocols: OpenSpeedTest supports HTTP/1.1, HTTP/2 and HTTP/3. The maker documents an embeddable iframe and Docker deployment, rather than named third-party integrations.

Pricing

OpenSpeedTest costs nothing. The free and open-source plan includes the HTML5 network speed test, a widget available for personal and commercial use, and self-hosted deployment. There is no paid tier described, so readers choosing it do not have a paid upgrade path to weigh against the free option.

Platforms

OpenSpeedTest supports Android, iOS, Linux, macOS, Windows and the web, with self-hosting also available. Browser access avoids installing a dedicated test app, while self-hosting requires the network address, domain and email prerequisites noted above.

Who it's for

It is a sensible choice for home users, small offices and teams that need to measure their own network or infrastructure. The embed and URL controls also suit organizations that want to offer a connection test through a website or app. Look elsewhere if your main need is extended Firefox stress testing beyond the stated limits, or if you need a different kind of network analysis.

Pros and cons

Pro: Measures speed, latency, jitter and stability in a browser, so users do not need a test app or plugin.

Pro: Free commercial embedding and self-hosting make it practical for organizations that want to offer or operate their own test.

Pro: URL parameters provide control over test type, stress runs and connection settings for repeatable checks.

Con: Firefox is not recommended for stress tests over 10 minutes or above 2.5 Gbps, which limits those use cases.

Con: Self-hosting entails domain and public-address requirements, so it is less turnkey than simply using the browser test.

Con: The privacy policy says the service may collect names, email addresses, cookies and browser or device information including IP address; it dates from June 1, 2018.

Alternatives

For more options, browse Network Testing Software.

PingPlotter is worth considering if its free plan's one-connection limit, lack of remote collection and 10-minute monitoring history suit your needs, or if you want to compare its paid Professional Edition at $29 a month.

LibreSpeed is another free, open-source self-hosted speed-test option for readers comparing alternatives in this category.

TRex is a free open-source Linux application for readers with the required hardware and NIC setup.

Tessabyte is an alternative with a 1-user license at $39 as a one-time purchase for Windows and macOS, permitting installation on up to three personal machines.

EVE-NG may suit readers comparing a network lab platform, with its free tier capped at 7 nodes per instance and 63 per lab, and restricted to the Admin role.

iPerf2 is a free alternative for readers comparing its Professional and Community editions.

GNS3 is an open-source option users can download and use for free.

Mininet is a permissively licensed open-source option for Linux-kernel environments, limited by one server's CPU and bandwidth.

Verdict

Choose OpenSpeedTest if you want a free browser-based connection check that you can embed or host on your own infrastructure. Its range of core measurements and configurable tests make it useful for home networks and teams managing their own setup. Look elsewhere for extended Firefox stress tests or a different form of network analysis.