Selenium

Judgement

What it is

Developer tool

What it does

The browser automation project behind the W3C WebDriver standard, with client libraries for Java, Python, C#, Ruby and JavaScript and Selenium Grid for running browsers in parallel.

Adopt it when

You need to drive real browsers through the WebDriver standard, use languages beyond Playwright's, or run a large existing Selenium suite or Grid.

Watch out

Tests are more prone to timing flakiness than with Playwright, and you manage more of the waiting and setup yourself.

Ready for

Production-ready

Runs as

Library and self-hosted server

Built with

Java, C#, Python, JavaScript and Ruby

How established

Established: started 14 years ago, latest release selenium-4.52.0.

What the license allows

You can build it into a product you sell, as long as you keep its copyright notice.

Judged on 2026-11-06 from the project's README and GitHub data. The license and age lines are worked out directly.

Built from

Follow it down: Selenium → JDK → LLVM project → runs on a microchip

How compilers were built, back to punched paper tape

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