vs patchright

Playwright stealth vs Patchright: driver vs engine

Patchright and invisible_playwright do not compete: Patchright patches the Playwright driver and runs only on Chromium, while this project patches the Firefox engine itself in C++. They fix different tells at different layers, so the useful question is not which is better but which engine your job needs and which tells you are chasing.

Three ways to make Playwright undetected puts the two on different rungs: same automation problem, two layers apart. That is why "which is better" is the wrong question. The useful one is which tells live at which layer, and what each tool leaves for you to solve elsewhere.

What Patchright actually changes

Patchright is a drop-in fork of Playwright itself, not a browser. It patches the automation framework's own code so the Chromium DevTools Protocol stops leaking the things that give it away: it avoids Runtime.enable, which is one of the most commonly checked CDP artifacts, by executing JavaScript through isolated execution contexts instead; it disables Console.enable outright, at the cost of console functionality not working under Patchright at all; and it changes the default launch flags, adding --disable-blink-features=AutomationControlled and dropping --enable-automation, so navigator.webdriver is never set to begin with rather than being set and then patched back to false.

That last distinction is the entire case for driver-level patching, and it is worth stating precisely because the levels page makes the same point about our own layer choice: a value that was never set is not the same as a value that was set and then hidden. There is nothing for a detector to find, versus something a detector has to be persuaded is normal.

Why these do not compete: engine and layer are both different

Patchright is Chromium-only. Its own documentation says so directly: Firefox and WebKit are not supported. So if your job needs Firefox, this is not a decision between two options, it is already decided.

The layer is different too. Patchright's target is the CDP session between the driver and the browser. This project's target is the browser's own C++, which is a different protocol entirely: Firefox does not speak CDP in the way Chromium does; Playwright drives it through Juggler, an internal Firefox protocol we patch directly and whose own compatibility contract with the Playwright client breaks in its own specific way, unrelated to anything CDP does. Every tell Patchright fixes is specific to the CDP session, which means it is not a tell our project has, and not one this project's patches address either, because it does not arise on this engine.

What Patchright fixes that we never had to

Every tell Patchright fixes is a CDP-session artifact that Firefox cannot have, which shows how CDP-specific the whole category is. Runtime.enable and Console.enable are CDP domain calls; Firefox has no CDP domains to enable. The automation-controlled blink feature flag is a Chromium build flag; Firefox has nothing named after it. None of these three fixes has a Firefox equivalent to patch, because the surface they patch does not exist here.

That does not mean Firefox has no automation-layer tells of its own. It has different ones, and we found four in the driver layer of our own stack rather than the engine: JIT-disabling timing, driver frames appearing in stack traces, evaluated code labelled as a debugger evaluation, and a helper script that ran in the page's realm before the page's own code did. Those four are documented here. The lesson generalises past either tool: every automation layer has its own protocol, and every protocol leaks its own way.

What Patchright does not touch, by its own account

Patchright is explicit that it patches the driver, not the machine. The GPU Chromium reports, the fonts it enumerates, the audio stack, the canvas output: all of that is still whatever the underlying Chromium build actually has, because nothing in Patchright changes it. Pairing driver-level stealth with page-level or engine-level fingerprint work is normal, and Patchright's own documentation does not claim otherwise.

Patchright is also candid about two of its own remaining gaps: init scripts injected for page setup "can be detected by timing attacks," and running the full Playwright test suite against Patchright, it "passes most, but not all" of it. That second point has a practical cost worth flagging if you are choosing this route: a patched driver is a fork you now depend on tracking Playwright's own releases, and "most, but not all" means some API surface may behave differently than documented Playwright behaviour.

The Chromium-is-not-Chrome question, restated for a fork

Because Patchright is a Playwright fork, it launches the same Chromium build Playwright ships by default - Chrome for Testing as of Playwright 1.57, which closed the codec gap but not the Widevine one - unless you also set channel="chrome" yourself. That remaining gap is not a driver-level problem and patching the driver does not close it. It is worth keeping the two concerns separate when evaluating any Chromium-based stealth tool: driver-level patches fix automation tells, they do not fix DRM tells, and nothing in Patchright's README claims they do. The channel="chrome" launch option is Playwright's own documented setting for opting into a branded browser, unrelated to anything a driver fork patches.

How to actually choose

• Need Firefox specifically? This project or Camoufox; Patchright does not run on either engine.
• Committed to Chromium, and the tells you are chasing are CDP-specific? Patchright fixes exactly that category, and does it without a browser fork to maintain.
• Committed to Chromium, but the tells are about the machine (fonts, GPU, canvas, audio)? A driver patch does not reach that surface on any engine. You need something at the engine layer, and today that means Firefox.
• Need proprietary codecs on Chromium regardless of driver? Set channel="chrome" yourself; no driver-level fork changes that Playwright default.
• Undecided? Test against your actual target with both approaches and read what each one still gets flagged for, using a method that checks the signal fired, not just that a verdict came back clean.

Conclusion

Patchright and this project solve adjacent problems on different engines. Patchright closes the CDP-session gap on Chromium at essentially no engineering cost to you: it is a drop-in fork. This project closes the surfaces no driver patch can reach, at the cost of a browser you now depend on us to keep building. Neither replaces the other's layer, and on Chromium specifically, driver-level and page-level stealth are commonly used together for exactly that reason.

Short answers to the questions that lead here

Is Patchright better than invisible_playwright? They are not comparable directly. Patchright patches the Chromium driver; this project patches Firefox's engine. Pick by engine first, then by which tells matter for your target.

Does Patchright work with Firefox? No. Its own documentation states only Chromium-based browsers are supported.

Does Patchright fix fingerprinting? No, by its own scope. It fixes CDP-session automation tells, not fonts, GPU, canvas, or audio, which is a different layer.

Can I use Patchright and a fingerprint tool together? Yes, and that is the normal pattern on Chromium: driver-level stealth for the automation tells, something else for the machine-level ones.

Does Patchright fix the Chromium-is-not-Chrome codec problem? No. That is a Playwright launch setting (channel="chrome"), unrelated to what the driver patch changes.

See also: three ways to make Playwright undetected, for the full map this comparison sits inside; Firefox or Chromium for anti-detect, for the engine question Patchright's Chromium-only scope decides for you; four leaks from our own driver layer, for what the equivalent problem looks like on Firefox; and invisible_playwright vs rebrowser-patches, an unrelated project that independently converged on close to the same Runtime.enable fix.

Sources

• Patchright's own GitHub documentation, read 2026-07-28, for its stated scope (Chromium-only), its Runtime.enable / Console.enable / launch-flag fixes, and its own admitted gaps (init-script timing attacks, "passes most, but not all" of the Playwright test suite).
• This project's own patch catalogue and debugger-timing-detection.md for the equivalent Firefox-side automation-layer fixes.
• MDN, navigator.webdriver, read 2026-08-06, for what the property indicates and when a browser sets it.
• Playwright's own BrowserType.launch() docs, channel option, read 2026-08-06, for the channel="chrome" launch setting.
• Where a claim about Patchright's internals could not be checked beyond its own documentation, this page does not assert one.

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From the notes of invisible_playwright, a Firefox patched at the C++ level. Patchright solves a real problem on Chromium that this project does not have on Firefox, and does not try to solve a problem it never claimed to.