01
Create a session
Your backend hits POST /v1/sessions. We return a session_id and 5 randomly chosen challenges.
Liveness API · v3 live
Verify realhumans,not photos.
Challenge-response biometric verification built for developers. 7 challenge types, 5 per session — impossible to spoof with a photo, video replay, or deepfake.
<500ms
Response time
99.9%
Uptime SLA
7
Challenge types
How it works
Three calls. One real human.
A session-based flow you can wire up in an afternoon. We handle the biometrics — you get a clean liveness score.
02
Run the challenges
The LivFace SDK opens the camera, prompts the user, and streams frames every 800ms while they respond in real time.
03
Get a verdict
We analyze frames with MediaPipe landmarks and return a liveness_score plus a pass/fail you can trust.
Challenge library
7 ways to prove you're alive.
Every session draws 5 random challenges from the set below. Randomization is what makes replays useless.
Blink
Eye-aspect-ratio drop detected across consecutive frames.
Smile
Mouth-corner displacement and cheek-raise geometry.
Turn left
Yaw angle crosses threshold while landmarks stay tracked.
Turn right
Opposite-yaw rotation confirmed against the nose vector.
Open mouth
Inner-lip vertical distance exceeds the open threshold.
Look down
Pitch angle and eyelid geometry verify a genuine glance.
Raise eyebrows
Brow-to-eye distance increase tracked frame over frame.
Built for developers
Drop it in.
Ship it today.
REST + lightweight SDKs. No ML ops, no GPUs, no model wrangling. Authenticate, create a session, render the widget.
- Idempotent, session-based REST API
- Web, iOS & Android SDKs
- Webhooks for async verdicts
- SOC 2 · GDPR · on-device frame capture
import { LivFace } from "@livface/sdk"; const live = new LivFace(process.env.LIVFACE_KEY); // 1. Create a liveness session const session = await live.sessions.create({ challenges: 5, redirect: "https://app.acme.io/verified" }); // 2. Hand the id to your frontend widget res.json({ sessionId: session.id }); // 3. Read the verdict (or use a webhook) const result = await live.sessions.get(session.id); console.log(result.livenessScore); // 0.98
5
challenges / session
800ms
frame cadence
468
facial landmarks
$0
to start
Pricing
Start free. Scale when you ship.
Daily check limits, no per-seat nonsense. Upgrade the moment you cross the line — never before.
Free
$0/mo
For prototypes and weekend builds.
- 100 verifications / day
- Basic liveness detection
- 7 challenge types
- Community support
No credit card required.
Growth
$29/mo
For early-stage apps launching their first production traffic.
- 1,000 verifications / day
- Everything in Free
- ID document verification
- Webhooks
- Email support · 24h turnaround
Instant access, cancel anytime.
Scale
$79/mo
For established platforms with scaling auth needs.
- 10,000 verifications / day
- Everything in Growth
- Priority support
- SLA guarantee
Includes priority migration support.
High-Volume
$199/mo
Enterprise-grade capacity without the enterprise friction.
- 50,000 verifications / day
- Everything in Scale
- Dedicated support
- Face ID database
- Custom SLA
Self-serve setup. No sales calls required.
Ship verification
your users can't fake.
Spin up a session in minutes. The free tier never expires.