---
title: Liveness
description: Capability that verifies the user is real and alive at the moment of selfie capture. The biometric anchor of nearly every IDCloud flow.
canonical: https://developer.unico.io/capabilities/liveness
locale: en
generated_by: markdown-export
---

- [/](/)
- [Capabilities](/capabilities)
- Liveness

**On this page# Liveness

When the user is present in an identity journey, Liveness is the first capability to run.
### What it does​

Detects whether the captured selfie comes from a real person in front of the camera, and not from a photograph, video, mask, or any other injection attempt. It works alongside the SDK or Unico's Web Journey to guide the user until a biometrically valid frame is obtained.
### Inputs​

Capture is handled by the SDK or the Web Journey — you do not send an image manually to Liveness. The input is the session opened via [Create Process](/developers/api-reference/post-processes) with a flow that includes Liveness.
API integration requires the SDKTo use Liveness in headless API integration, the implementation of one of the Unico SDKs (Web, Android, iOS, or Flutter) is **required** — Liveness cannot be invoked via API alone with a base64 image.
### Possible responses​

ResponseMeaning`YES`User is alive.`NO`Liveness attempt failed.
API enum valuesIn the Web & Native contract response, these map to `LIVENESS_RESULT_LIVE` (`YES`) and `LIVENESS_RESULT_NOT_LIVE` (`NO`) in the `authenticationInfo.livenessResult` field. See Get Process for the full enum table.
### Availability​

Integration components requiredAPI Web or SDK
### Valid combinations​

Liveness is part of nearly every flow in the catalog:
`idlive`, `id`, `idlivetrust`, `idtrust`, `idcheck`, `idchecktrust`, `iddocs`, `idsign`, `iddocssign`, `idchecktrustdocs`, `idchecktrustsign`, `idchecktrustdocssign`, `idtrustdocs`, `idtrustsign`, `idtrustdocssign`, `idunicodocs`, `idunicosign`, `idunicodocssign`, `idunicoserprodocssign`, `idcheckserpro`, `idcheckserprodocs`, `idcheckserprodocssign`, `creditoconsignado`, `idtoken`, `idtokentrust`, `idtokensign`.
For the full matrix, see [Available flows](/developers/start/flows).
Only flow without Liveness`idsmart` (Smart Revalidation) — replaces active capture with metadata validation plus previously captured biometrics.
### Products that use this capability​

[Onboarding](/products/sign-up/onboarding/index)
[Non-document verification](/products/sign-up/non-document-verification/index)
[Age Verification](/products/regional-solutions/age-verification/index)
Last updated on Oct 8, 2026**