invisible_playwright vs playwright-stealth: page vs engine

This is the widest gap between any two tools on this site’s comparison pages, and the honest way to frame it is by layer rather than by which one “wins.” Three ways to make Playwright undetected puts playwright-stealth at level 1, patching the page. This project sits at level 3, patching the engine and rebuilding the browser. They are not really competing for the same job, and the tool’s own maintainer says as much.

What playwright-stealth actually does

playwright-stealth traces back to puppeteer-extra-plugin-stealth on the Node side, ported to Python. Mechanically it is init scripts: JavaScript injected into the page before the site’s own code runs, redefining the properties a detector is likely to check. navigator.webdriver, the plugins array, navigator.languages, and similar.

The appeal is real and worth stating plainly. It is a few lines added to an existing Playwright script, no browser fork, no binary to maintain, and it works immediately against anything checking those properties directly.

The structural limit is not a bug, it is what the approach is. Every override playwright-stealth installs is a JavaScript value living in the same page realm as the code trying to detect it. A property you redefine becomes an own property where a native one is inherited. A replacement getter is a function, and every function carries its source, so printing it shows the override rather than [native code]. Patch Function.prototype.toString to hide that, and the patched toString becomes the new anomaly, checkable the same way. We cover the general version of this race here: you are altering values inside the exact runtime the opponent’s code is also running in, and the opponent always gets to look at what you changed.

What it never touches, by construction

An init script cannot change what the font subsystem enumerates, what the GPU driver reports through WebGL, how the audio pipeline rounds a signal, or what the TLS stack sends in a ClientHello. Those answers come from native code below the page, and a script running inside the page has no path to them. This project’s case for patching the engine instead is built entirely on that gap: fonts, WebGL parameters, the audio stack, and the TLS handshake are four surfaces a page-level tool cannot reach on any browser, by construction, not by an oversight anyone could patch around.

The tool is honest about this, more than most of its category

Worth stating because it is unusually direct for this space. The maintainer of the actively developed Python fork describes it as a proof-of-concept starting point and says plainly not to expect it to get past anything but the simplest detection methods. That is not marketing copy undercutting itself, it is an accurate scope statement, and taking a tool’s own stated limits at face value is the same approach this page took with Camoufox’s, Patchright’s, and nodriver’s documentation.

When playwright-stealth is actually the right call

Not a rhetorical question. If the thing flagging you is a naive check, navigator.webdriver being true, an empty plugins array, a User-Agent string with HeadlessChrome in it, four lines of playwright-stealth fixes exactly that, today, with no browser to build or maintain. Reaching for an engine-level rebuild before confirming the block is not that simple is solving a problem you may not have. How to actually test which layer you’re failing at covers how to tell the difference before picking a tool.

How to actually choose

Blocked by an obvious property check, need a fix today? playwright-stealth, in about four lines.
The block survives that, and the site inspects your GPU, fonts, audio, or TLS? No page-level tool reaches those; you need driver-level or engine-level work.
Need the fix to also survive a toString or own-property check? Level 1 cannot do this by construction; move up a level.
Not sure which layer is actually blocking you? Test it directly rather than guessing, with a method that checks the signal fired, not just that the run came back green.

Conclusion

playwright-stealth is honest about what it is: a fast, low-cost fix for the obvious checks, built by its own maintainer’s account as a starting point rather than a destination. It is often the right first thing to try, and the wrong thing to expect more from than it claims. This project exists for the surfaces that approach cannot reach at all, at the cost of a browser fork instead of four lines.

Short answers to the questions that lead here

Is playwright-stealth still worth using? Yes, for the layer it targets: obvious property checks. It is not intended to fix machine-level signals like fonts or GPU.

Does playwright-stealth fix navigator.webdriver detection? Yes, that is exactly its target. Whether that is enough depends on what else the site checks.

Why doesn’t playwright-stealth fix canvas or WebGL fingerprinting reliably? Because an init script runs inside the page, and those values come from native code the page cannot reach or fully rewrite convincingly.

Is playwright-stealth a Firefox tool? No, it works against whatever browser Playwright launches; it is not engine-specific the way this project or Camoufox are.

Can I use playwright-stealth and a driver patch like Patchright together? Yes, they address different layers; combining them is a normal pattern on Chromium.

See also: three ways to make Playwright undetected, for the full map this page sits inside; why every override carries its source, for the race any page-level fix eventually loses; and how to test which layer is actually blocking you, before picking a tool at any level.

Sources

The actively maintained Python fork’s own GitHub documentation, read 2026-07-28, for its stated scope (“a proof-of-concept starting point,” not expected to bypass anything but the simplest detection) and its init-script mechanism.
This project’s own patch catalogue for the engine-level surfaces an init script cannot reach.

From the notes of invisible_playwright, a Firefox patched at the C++ level. playwright-stealth solves the layer it says it solves, and does not claim the one this project exists for.