Multilogin Detection

How to detect Multilogin in 2026

Multilogin pioneered the commercial antidetect category in 2015 and remains the reference implementation. Ships with two engines — Mimic (Chromium-based) and Stealthfox (Firefox-based). Used heavily by enterprise fraud operations because of its team-collaboration features and audit logs.

Detection signals that fire on Multilogin

Sentinel runs a consistency check across 40+ low-entropy fingerprint signals on every evaluation. The signals below are the ones that, in our internal testing, fire most reliably on fresh Multilogin profiles paired with residential proxies. None alone is diagnostic — the combination is.

Stealthfox vs UA Firefox version

When using the Stealthfox engine, the underlying Firefox build doesn't always match the claimed Firefox version in the UA string.

Mimic Chromium-fork signature

Mimic's Chromium fork has small but consistent deviations in how it handles the WebGL extension list under load.

Audio context fingerprint

Audio fingerprint hash falls in a narrow range across Multilogin profiles even when other signals appear varied.

Font fallback chain

Custom font-loading order in Multilogin engines doesn't match the OS-native fallback chain.

DOM property enumeration order

Order of properties returned by Object.getOwnPropertyNames(window) deviates very slightly but consistently.

Cookie partition behaviour

Multilogin's storage partitioning leaves traces in how third-party cookies are scoped per profile.

Multilogin pricing starts at $99/month — the customer base skews professional. Detection focuses on the engine-level fingerprint rather than the user-controllable spoofs.

How to integrate

Embed the Sentinel SDK on your signup, login, or checkout page. Server-side, call /v1/evaluate with the SDK token. The response includes device.antidetect (boolean) and device.tampering_score (0–1). Block, step-up, or score on the result.

See the API reference for the full request/response shape and the 2026 antidetect detection deep-dive for the underlying technique.

Block Multilogin sessions with one API call.
Free during open beta. 1,000 requests / hour. No card.

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