Choose Playwright if you want a modern, batteries-included test runner with auto-waiting, tracing and parallel runs across Chromium, Firefox and WebKit from one API. Choose Selenium if you need broader language and browser coverage, a W3C standard protocol and Selenium Grid for spreading tests across many machines. Both are free and open source. Playwright comes from Microsoft and supports TypeScript, Python, .NET and Java; Selenium is a long-running project under the Software Freedom Conservancy.
Testing teams often pick whatever the last person used, and that's rarely the right reason. I read the Selenium documentation for WebDriver and Grid and Playwright's home, browsers, languages and parallelism pages to set out the real differences.
Selenium and Playwright at a glance
| Selenium | Playwright | |
|---|---|---|
| Who's behind it | Software Freedom Conservancy project | Microsoft |
| How it drives browsers | WebDriver, a W3C Recommendation, plus WebDriver BiDi | Its own API over Chromium, Firefox and WebKit |
| Languages | Several official language bindings | TypeScript, Python, .NET and Java |
| Test runner | Bring your own framework | Playwright Test with auto-waiting and assertions |
| Scaling out | Selenium Grid across multiple machines | Built-in parallelism and sharding |
| Debugging | Logging and BiDi events | Trace Viewer, codegen and a VS Code extension |
| Safari coverage | Safari driver | WebKit builds, not branded Safari |
The standards story behind Selenium
Here's a detail many comparisons miss. Selenium's docs say Selenium WebDriver is a W3C Recommendation, and that WebDriver BiDi, the W3C bidirectional protocol that adds a WebSocket connection so scripts can stream and react to browser events, was created by the Selenium project together with the browser vendors. So the standard way browsers are automated owes a lot to Selenium, and its tests talk to browsers through that shared protocol.
Playwright's route is different. Its browsers page explains that each Playwright version needs specific browser binaries, installed through its own CLI, and that every time you update Playwright you may need to re-run the install. For Chromium-based browsers it uses open source Chromium builds by default, and its Safari coverage comes from WebKit rather than the branded Safari app.
Why teams like Playwright
The Playwright home page lists the features developers rave about: auto-waiting so actions only fire when elements are ready, web-first assertions that retry, codegen that records your clicks into test code, a Trace Viewer with DOM snapshots, network requests and screenshots at every step, and parallel runs across browsers. It'll also run branded Google Chrome and Microsoft Edge and emulated mobile devices, and Playwright MCP lets AI agents control a browser through accessibility snapshots.
Why teams stay with Selenium
The Selenium project describes itself as an umbrella project of tools and libraries for browser automation. WebDriver drives a browser natively, as a user would, either locally or on a remote machine, and Selenium Grid routes commands to remote machines so you can run tests in parallel across many of them. Its docs cover Chrome, Edge, Firefox, Internet Explorer and Safari, and there's Selenium Manager to handle drivers plus Selenium IDE for recording.
Quick decision guide
- Starting a new web test suite in TypeScript or Python? Try Playwright first.
- Need tests in a language Playwright doesn't list? Selenium's bindings cover more.
- Running hundreds of tests across a farm of machines? Selenium Grid was built for it.
- Fighting flaky tests? Playwright's auto-waiting and Trace Viewer target that problem.
- Must test real branded Safari? Check Selenium's Safari driver against Playwright's WebKit builds.
For the wider tooling picture, my guide on how API testing tools sharpen web development skills covers the layer below the browser, and this list of AI coding assistants can speed up writing the tests themselves.
My advice on Selenium or Playwright
For most small teams starting today, Playwright is the quicker path to stable end-to-end tests, thanks to its runner, auto-waiting and tracing in one install, and you'll spend less time chasing flaky failures. Selenium still makes sense when you already have a large Selenium suite, need broad language support or run tests across a Grid of machines. Don't rewrite a working Selenium suite just because Playwright is newer; add Playwright for new projects and compare flakiness over a few weeks.
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Frequently asked questions
Is Playwright free?
Yes. Playwright is open source and available for TypeScript, Python, .NET and Java.
Is Selenium free?
Yes. Selenium is an open source project, and its WebDriver, Grid and IDE tools are free to use.
Can Playwright test Safari?
Playwright runs tests on WebKit builds, the engine behind Safari, alongside Chromium and Firefox. It doesn't drive the branded Safari app.
What is Selenium Grid?
Selenium Grid runs WebDriver scripts on remote machines by routing commands to them, so you can run tests in parallel across multiple machines.
Who makes Playwright?
Playwright is made by Microsoft. Its site carries a Microsoft copyright and privacy statement.
