# Face Authentication Check

### About service

The Face Authentication Check is a **facial biometric authentication** service.

It uses our **face match** and **liveness** engine to authenticate your customer's facial attributes against their **enrolled face**.

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This type of check requires a customer's face to be **enrolled** first.
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We recommend running this type of check through our [Hosted Solution](https://app.gitbook.com/s/lv7UhJvTbxeq4s3KwQpn/web-integrations/hosted-solution-quick-guide), [Web SDK](https://app.gitbook.com/s/lv7UhJvTbxeq4s3KwQpn/web-integrations/web-sdk-quick-guide), or native [Mobile SDKs](https://app.gitbook.com/s/sw26JqCBnT6AEIbxAYyk/quick-guides/mobile-sdk-guide).
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[Learn about the Face Authentication Checks API.](https://app.gitbook.com/s/kAhgmUKSf8CFUFVL3GEe/check-types/face-authentication-check)
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### Common use cases

Use Face Authentication when you need fast **biometric customer authentication**:

* **Passwordless login**: Replace passwords with selfie-based face authentication.
* **Account recovery**: Re-authenticate users for **account reactivation** and **unlock** flows.
* **Step-up authentication**: Add a biometric challenge for high-risk actions.
* **Periodic KYC re-verification**: Confirm the same user returns over time.

### Analysis performed

The Face Authentication Check confirms whether a customer’s **live face** matches their previously **enrolled face**.

The diagram below outlines the key analysis categories.

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![Face Authentication Overview: Selfie-based Biometric Matching and Liveness Scoring](https://1615271746-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FKyFKMqftsmT6qln9zo5y%2Fuploads%2FnIV4PPTGjo7O7YojqaiM%2Fface_authentication_check_service_v2.png?alt=media\&token=52a3bad4-4ba9-406d-8107-61774ec8206e)

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**Detailed verification checks**

<table><thead><tr><th width="208.7734375">Analysis</th><th>Verifications Performed</th></tr></thead><tbody><tr><td><strong>Face authentication</strong></td><td>Determines whether the live selfie matches the enrolled face.</td></tr><tr><td><strong>Liveness scoring</strong></td><td>Returns a confidence score between 0–100%. 100% indicates a highly reliable live presence. 0% indicates a likely spoof attempt.</td></tr></tbody></table>

### Check duration

A Face Authentication Check takes an average of **2 seconds** to complete.

### Related checks

You’ll typically run Face Authentication Check alongside:

* [Identity Check](https://docs.complycube.com/documentation/product-guides/biometric-and-liveness-verification/identity-check) runs selfie liveness and face match against an ID photo. It can also enrol the face.
* [Enhanced Identity Check](https://docs.complycube.com/documentation/product-guides/biometric-and-liveness-verification/enhanced-identity-check) when you need video challenges for higher assurance.
* [Device Intelligence](https://docs.complycube.com/documentation/product-guides/digital-fraud-intelligence/device-intelligence-check) to add device-level fraud signals to authentication flows.

### Related topics

Use these docs when designing end-to-end onboarding and authentication journeys:

* [Workflows](https://docs.complycube.com/documentation/product-guides/compliance-studio/workflows) to orchestrate step-up authentication and follow-up decisions.
* [Hosted Solution](https://app.gitbook.com/s/lv7UhJvTbxeq4s3KwQpn/web-integrations/hosted-solution-quick-guide), [Web SDK](https://app.gitbook.com/s/lv7UhJvTbxeq4s3KwQpn/web-integrations/web-sdk-quick-guide), and [Mobile SDKs](https://app.gitbook.com/s/sw26JqCBnT6AEIbxAYyk/quick-guides/mobile-sdk-guide) for guided selfie capture.