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Foil detects AI-controlled browsers, automation frameworks, and anti-detect tools. It scores more than 350 signals on the server, and detection adds no step for real users. Add Foil to your frontend with two lines of code, then verify each session on your backend with one of the five server SDKs.

Quickstart

5-minute integration guide

How it works

The detection pipeline

Server verification

Verify on your backend

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Common use cases

Signup

Block automated account creation at the source.

KYC fraud

Stack with your KYC vendor to catch identity farming.

Login

Stop credential stuffing without trapping real users.

Checkout

Add Foil signal to your payments fraud stack.

User-generated content

Catch LLM-written spam at the composer.

API abuse

Block LLM scrapers; keep legitimate crawlers.

Promo & trial abuse

Catch repeat claims across account rotations.