TL;DR
CreepJS and Benny look related, but they are built for different jobs. CreepJS is an open-source, MIT-licensed research and education project that collects an unusually deep set of signals to detect lying, spoofed user agents, anti-detect browsers, and tampered APIs, and presents a trust score and a detailed report. Its own README says it is not meant to be a fingerprinting library.
It ships as a hosted demo and source you clone, with no npm package, and it does not return a stable device ID you would build an app on.
Benny is a production library. It returns a per-browser fingerprint and a deterministic cross-browser hardwareFingerprint, ships a compareFingerprints API with six modes, and runs a free rule-based anti-spoof check on every result. If you want to audit your own entropy or study anti-detect browsers, use CreepJS. If you want a stable identity to ship, that is Benny.
Different jobs: library vs research tool
This is not a like-for-like comparison, and it would be dishonest to pretend it is. CreepJS is a research and education project. Its goal, stated plainly in its own README, is to study how identifiable browsers are and how anti-detect tooling lies, not to be a drop-in fingerprinting library.
Benny is a production library with one job: return a stable device identity you can build on, with a comparison API and anti-spoof in the box. People often find CreepJS first, because it is the most impressive public demonstration of fingerprinting, then realize they cannot actually install it as their identity layer.
So read this page as follows: if CreepJS is what sent you down this path, here is what you were probably looking for, and where CreepJS is still the better tool.
Distribution: install it vs host it
CreepJS has no npm package. The supported way to use it is the hosted demo, or cloning the source and standing it up yourself. That is entirely reasonable for a research tool you run to inspect a browser, and awkward for a dependency you want in production.
Benny is an npm install and a function call. No account, no API key, no cookies, no server to host. The identity comes back client-side in one call.
If your plan was to install CreepJS and call it, that path does not exist. Benny is the library-shaped option.
What you get: a stable ID vs a trust report
CreepJS produces a trust score and a detailed, per-signal breakdown built to expose inconsistencies. It is excellent for understanding entropy and catching browsers that lie. It is not built to hand you the same identifier reliably on the next visit, which is the one thing an identity layer has to do.
Benny returns two hashes designed to be stable: a per-browser fingerprint, and a hardwareFingerprint that stays identical across Chrome, Safari, Firefox, and Brave on the same device. Plus compareFingerprints to score how similar two of them are.
Trust report versus stable ID is the core split. They are complementary outputs, not interchangeable ones.
Anti-spoof: both do it, different shapes
Spoof detection is where the two genuinely overlap. CreepJS is arguably the deepest public exploration of lie detection: cross-property consistency, anti-detect browser signatures, and headless and tampered-API checks. As a research surface for studying evasion, it is hard to beat.
Benny ships a narrower, rule-based consistency check inside a production library. Every fingerprint result carries a score, a list of flags, and a spoofLikelihood rating of low, medium, or high, in the free tier. It is built to run on every request in production, not to be read by a human auditor.
If your goal is to study spoofing, CreepJS goes deeper. If your goal is a spoof signal attached to a usable identity, that is Benny.
Where CreepJS is ahead
Honesty time. For its actual purpose, CreepJS is excellent, and Benny does not try to replace it.
It is fully open and MIT-licensed. You can read every check, fork it, and learn from it. Benny is closed-source. If you want to study exactly how lie detection is implemented, CreepJS is the better teacher.
It is the canonical entropy-audit tool. For inspecting how identifiable a specific browser is, or testing an anti-detect setup, CreepJS's depth and its live demo are the standard. Use it for auditing and research; that is what it is built for.
