BrowserLeaks alternative: one check that explains what it finds

BrowserLeaks is one of the oldest and most complete collections of browser tests. If you want a verdict rather than raw data, SpoofLens does a different job: it collects the same kinds of signals in one pass, compares them with each other and with what our server sees, and tells you in plain words where they disagree.

	BrowserLeaks	SpoofLens
Format	A separate page for each test	One page, all signals at once
Overall verdict	No, raw values per test	Truth index 0-100 and a verdict
Cross-checks	Each test stands on its own	Signals compared with each other, with a Web Worker, an iframe and the HTTP headers
Privacy browsers	Shows the values they change	Brave, Firefox resistFingerprinting and Tor Browser marked as protection, no penalty
WebRTC leak	Yes	Yes, local address and mDNS
TLS, HTTP/2, TCP/IP fingerprints	Yes (including JA3 and JA4)	Not yet, planned
DNS leak test	Yes	Not yet
Stores fingerprints	No, according to its privacy policy	No, only a daily count of checks
Price	Free	Free; Pro and Business plans are coming

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What BrowserLeaks is good at

BrowserLeaks has been around for well over a decade and covers almost every browser feature that can leak information: the IP address and request headers, JavaScript properties, WebRTC, canvas, WebGL, fonts, the Geolocation API, supported features, and network-level fingerprints such as the TLS handshake (JA3 and JA4), HTTP/2 settings and TCP/IP parameters.

Each test lives on its own page and shows the raw values. That is exactly what you need when you debug one specific API or want to see your TLS fingerprint.

What SpoofLens does differently

Raw values rarely answer the question most people have: does my browser look real, or does something give it away? A spoofed browser is usually not caught by one strange value but by two values that cannot both be true. A Windows User-Agent with a graphics card that exists only in Macs. A time zone that does not fit the IP country. A Web Worker that reports a different browser than the page.

SpoofLens collects dozens of signals in one pass and runs more than thirty consistency rules on them. Part of the data comes from your browser (navigator, screen, canvas, audio, WebGL, WebGPU, fonts, speech voices, media devices, WebRTC), part from our server (the network your IP belongs to, the Tor exit list, proxy headers, the User-Agent and Client Hints your browser actually sent). You get a truth index from 0 to 100, a verdict and a list of findings, each with an explanation.

When BrowserLeaks is the better tool

You need your TLS, HTTP/2 or TCP/IP fingerprint. SpoofLens does not measure these yet: they need dedicated server-side capture, which is on our roadmap.
You need a DNS leak test.
You want the full raw output of one API, for example every WebGL parameter and extension.
You test legacy or experimental features from its extra tools.

When SpoofLens gives the faster answer

You want to know in one click whether a browser looks consistent.
You build or test anti-bot protection and want to see which signals disagree in a given browser.
You use a privacy browser and want to know whether it reads as protection or as spoofing.
You need a result you can explain to a non-technical colleague.

Privacy

BrowserLeaks says in its privacy policy that it does not store user fingerprints. SpoofLens works the same way: the signals are sent to our server once for the cross-check and then forgotten, and we only count how many checks ran per day. Neither service needs an account.

Frequently asked questions

Is SpoofLens free?: Yes. The full browser check, the IP and anonymity page and 16 website tools are free and need no account. Paid plans for profile comparison and a website API are in preparation.
Can I use both?: Yes, and it often makes sense: SpoofLens for a quick verdict, BrowserLeaks for the raw data of a specific API or for network-level fingerprints.
Is SpoofLens affiliated with BrowserLeaks?: No. BrowserLeaks is an independent project. This page compares the two services based on what each one publicly offers.