Foil

What is Foil?

Foil is a device intelligence platform that tells you exactly who and what is visiting your site or mobile app. We offer a set of cutting-edge SDKs for Web, iOS, and Android that help you live stream hundreds of facts, behaviors, and tests collected from your user's mobile devices to power better fraud scores and rules.

This data helps reduce fraud — everything from detecting malicious AI agents, to finding users tampering with their device, network, or browser to circumvent detection and your defenses.

Features

1. See if it's a person, a bot, or an AI agentHundreds of known AI agents, crawlers and bot types - classified and named.
2. Tell when a device is lying about itselfHardware, network, and TLS signals that can't be spoofed from JavaScript.
3. Allow good bots and block bad onesAgent taxonomy with Web Bot Auth verification for legitimate crawlers and AI.
4. Replay what happened without seeing what was typedMouse, touch, scroll, orientation, form interactions. Privacy by design.
5. Show your auditors exactly why a session was flaggedEvery signal, category, and confidence level. Exportable.
6. Trust that the SDK can't be reverse-engineeredWASM, chain hashing, sealed scoring. Hardened and red-teamed.
7. Ship on web, mobile, or bothNative SDKs for Web, iOS, and Android. 350+ signals each.

Use cases

• Safe AI agent onboardingLet your users safely sign up for your business using their AI agents by separating malicious AI agents from good ones.
• Unofficial integration defenseStop AI agents from turning your product into their backend through browser automation and synthetic user traffic.
• AI agent access controlAllow, throttle, or block AI agents based on identity and risk characteristics.
• Account takeover, fake accounts & free tier abuseDurable device identity links users across resets, incognito, and new signups.
• Scraping detectionIdentify headless browsers, stealth automation, and anti-detect browsers harvesting your content.
• Payment fraudDetect spoofed devices and tampered browsers at checkout with unforgeable signals.
• Personalized returning user experienceRecognize returning visitors and reduce login friction and serve them personalized content, or reduce MFA challenges.