What is Antidetect Browser?
An antidetect browser is a browser built to run many separate identities on one machine. Each profile keeps its own cookies, storage and cache, its own proxy, and its own fingerprint - user agent, screen metrics, timezone, canvas and WebGL values - so sites see distinct devices instead of one browser switching between accounts.
Most are Chromium forks, with a few built on Firefox. The patches sit in the engine rather than in injected JavaScript, which is what separates a working product from a browser extension. An override written in page JavaScript leaves traces in Function.prototype.toString and in error stack traces, while a value changed in the C++ backing navigator or the canvas API reads as genuine. A profile holds a cookie jar, localStorage, IndexedDB and cache, stored locally and optionally synced to the vendor's cloud for team access.
A profile is bound to one proxy, and the rest of the identity should follow from that IP. Timezone, locale, Accept-Language and the geolocation API belong to the exit node, not to the host machine, and the better products set them automatically from an IP lookup. WebRTC is the other setting to check. Left in its default mode it can expose the machine's real public address through a STUN request that never passes through an HTTP proxy, so profiles route or replace it.
Automation is why most teams buy one. The product runs a local HTTP API: you ask it to start a profile, it returns a debugging endpoint, and Puppeteer, Playwright or Selenium attach to the already-running browser over the DevTools protocol instead of launching their own. The browser keeps its patched fingerprint and its bound proxy while the script only drives it. Pricing is per profile or per seat, with shared profiles and role permissions on higher plans.
Consistency beats randomization. A profile with a plausible, unchanging fingerprint that always arrives from the same mobile IP outlives one that regenerates noise on every launch, because the drift becomes the pattern. None of it addresses behaviour. A fresh profile that opens an account, posts, and follows fifty people inside a minute gets caught on timing regardless of how clean its canvas hash is. Age profiles slowly and keep each one on a sticky session.
Where you meet it
You reach an antidetect browser when the account count outgrows separate browser profiles and spare laptops. Every profile forces the same decisions - which proxy, which country, which fingerprint seed, and whether it is disposable or a long-lived asset. Budget for the proxy alongside the seat, because an aged account that suddenly jumps IP range is easier to catch than one that never moves. PROXIES.SX charges nothing per port, so a dedicated endpoint per profile costs only the traffic it uses.
Common questions
Do I still need proxies if I use an antidetect browser?
Yes. The browser changes what the page can read about your device; it does nothing to the IP address, which is still your own unless a proxy is bound to the profile. Ten unique fingerprints arriving from one home connection reads as one household running ten accounts, which is the pattern platforms look for.
Is using an antidetect browser legal?
The software itself is ordinary browser software and is not illegal to run. Using it to hold multiple accounts usually breaks a platform's terms of service, where the penalty is account termination rather than a legal one. Using it to commit fraud or bypass sanctions is illegal on its own terms, whatever browser is involved.
Can I drive an antidetect browser with Puppeteer or Playwright?
Yes, on most products. You call the local API to start a profile, receive a WebSocket debugging endpoint in the response, and connect to it rather than launching a browser yourself. The profile keeps its fingerprint patches and proxy binding, so your script inherits the identity instead of overriding it.
Related terms
Real 4G/5G mobile and residential IPs
PROXIES.SX runs carrier IPs in 100+ countries with HTTP and SOCKS5 on every endpoint. $4/GB down to $2.40/GB at volume, free endpoints and rotation, and your GB never expire.