Pulse, from color
Blood under the skin absorbs light. With each heartbeat the skin's color shifts very slightly, and the camera sees it.
Vital signs Any camera.
Guided check-ins on their phone, with
contactless vital signs as they answer.
eSSESSMENTEnergy · 4/5
Heart rate72 bpm
Upper breathing15 /min
Lower breathing15 /min
Participant check-in on a phone, with the matching answer and vital signs shown in the browser dashboard. The visual includes a heart rate of 72 bpm and upper and lower breathing rates of 15 per minute.
Meet eSSESSMENT.
Questions, guided breathing and vital signs, together on their phone.
See how it worksFor researchers and teams that collect data
Introducing
eSSESSMENT
Build a program with questions, guided breathing activities and camera readings, and run it on participants' own phones.
- Describe your protocol to Claude, and it builds the program
- Participants check in from the free Coherence app on their phone
- Review each answer next to its reading in Playback
How it works
You see a face. The camera sees a heartbeat.
Every heartbeat and breath makes tiny changes in the face and chest. Presage reads them from ordinary video.
Pulse, from your face
Each heartbeat changes how much light your skin reflects. The camera picks up those tiny color shifts across your face to find your pulse, a method called remote photoplethysmography (rPPG).
Breathing, from your chest
Each breath moves your chest and shoulders. The camera follows that rise and fall, frame by frame, in the same video to measure your breathing rate.
Any camera, about 30 seconds
Phone, laptop or webcam, with nothing to wear. Sit still with your face and chest in view, and every reading comes with a confidence score for how clean its signal was.
What you seeWhat the camera sees
Drag to compare. Changes are drawn much larger than they really are.
How it works
Your skin changes color with every heartbeat.
Far too little for you to see. A camera can measure it.
Camera pixels, close up
Average skin color– –bpm
Skin tone
Tested on all six skin types. Breathing comes from the rise and fall of the upper body.
How it works
One camera. Two signals.
Pulse comes from tiny color changes in the face. Breathing comes from the movement of the upper body.
Pulsefrom color in the face
72bpmBreathingfrom movement of the upper body
15/minHow it works
How a camera reads your vital signs.
No contact and no special hardware. Just light and movement.
Breathing, from movement
With each breath the chest and belly move out and back. The camera follows that movement, frame by frame.
Two ways to use Presage
One sensing engine.
Two ways to use it.
Run a program with eSSESSMENT. Or build camera sensing into your app with the SmartSpectra SDK.
Run your protocols on any phone
eSSESSMENTQuestions, guided activities, and vital signs in one check-in.
Launch your protocol today.
Launch your protocol today.
Add camera sensing to your tech
ContentView.swift
1
// File > Add Package Dependencies: SmartSpectra2import SwiftUI4import SmartSpectra5let sdk = SmartSpectraSDK.shared7sdk.config.apiKey = "YOUR_API_KEY"8sdk.config.cameraPosition = .front9sdk.config.requestedMetrics =10 SmartSpectraConfig.breathingMetrics +11 SmartSpectraConfig.cardioMetrics12try await sdk.start()MainActivity.kt
1
// app/build.gradle.kts2implementation("com.presagetech:smartspectra:3.4.0")3import com.presagetech.smartspectra.SmartSpectraSdk5val sdk = SmartSpectraSdk.shared7sdk.config.apiKey = "YOUR_API_KEY"8sdk.useCamera(CameraSelection.Front)9sdk.config.requestedMetrics =10 SmartSpectraConfig.breathingMetrics +11 SmartSpectraConfig.cardioMetrics12lifecycleScope.launch { sdk.start() }hello_vitals.cpp
1
// find_package(SmartSpectra CONFIG REQUIRED)2#include <smartspectra/smartspectra.h>3namespace spectra = presage::smartspectra;4spectra::SmartSpectraConfig config;6config.api_key = "YOUR_API_KEY";7config.requested_metrics =8 spectra::SmartSpectraConfig::BreathingMetrics();9config.AddMetrics(spectra::SmartSpectraConfig::CardioMetrics());10spectra::SmartSpectra sdk(config);11sdk.UseCamera(spectra::CameraSelection::Default()).Build();12sdk.Start();index.ts
1
// npm install @smartspectra/node-sdk2import { SmartSpectraSDK, CameraSelection,3 breathingMetrics, cardioMetrics, decodeMetrics }4 from '@smartspectra/node-sdk';5const sdk = new SmartSpectraSDK({7 apiKey: 'YOUR_API_KEY',8 requestedMetrics: [...breathingMetrics, ...cardioMetrics],9});10sdk.on('metrics', (buf) => console.log(decodeMetrics(buf)));11sdk.useCamera(CameraSelection.default);12sdk.start();SmartSpectra SDKPulse, breathing, HRV, facial signals, and more from any camera.
Install it into your app with only a few lines of code.
Install it into your app with only a few lines of code.
Clinical validation
The science behind the signals.
Explore FDA clearance, model performance and testing across all six Fitzpatrick skin types.
FDA 510(k) K254169
| Measurement | Clinical result |
|---|---|
| Pulse ratevs. ECG | 1.73 BPM RMSEAndroid 1.77 BPM RMSEiPhone |
| Respiratory ratevs. reference devices | 0.03 BrPM mean bias95% limits of agreement −2.17 to +2.23 |
FDA cleared
SmartSpectra Vital Signs Monitor 1.0 received FDA 510(k) clearance (K254169) for contactless measurement of pulse rate and respiratory rate.
View FDA clearanceModel cards
Arterial pressure waveform and pulse rate
0.64 BPM RMSE
- Total
- 118 subjects, 418 videos
- Reference standard
- Biopac EKG and continuous blood pressure monitor.
Presage vitals by video analysis generates a relative arterial pressure waveform and pulse rate from a video of a subject.
at 80% Return Rate, Confidence >= 97
Model cardBreathing
0.67 BrPM RMSE
- Total
- 93 subjects, 184 videos
- Reference standard
- ETCO2 via biopac peak detection for breathing rate ground truth.
Presage vitals by video analysis generates breathing rate metrics from a video of a subject.
at 80% Return Rate, Confidence >= 79
Model cardHRV
13.83 ms RMSSD RMSE
- Total
- 118 subjects, 418 videos
- Reference standard
- Biopac 3-lead ECG.
Presage vitals by video analysis generates heart rate variability metrics (RMSSD, SDNN, Baevsky Stress Index) from a video of a subject.
at 80% Return Rate, Confidence >= 79
Model cardRelative arterial pressure waveform
0.681 Waveform Pearson r
- Total
- 118 subjects, 418 videos
- Reference standard
- Biopac continuous blood pressure monitor (for waveform correlation at 60s windows).
Waveform of relative arterial pressure (amplitude in arbitrary units vs. time). Represents waveform shape only (e.g., heartbeat timing, shape and relative changes). Not a blood pressure measurement and cannot be used to estimate systolic or diastolic pressure.
Confidence >= 0, Return Rate (%): 100.0
Model cardUpper and lower breathing waveforms
0.794 Upper Waveform Pearson r
- Total
- 93 subjects, 184 videos
- Reference standard
- ETCO2 via biopac peak detection for breathing rate ground truth.
Upper chest and lower abdominal breathing waveforms (amplitude in arbitrary units vs. time) with confidence.
Confidence >= 0, Return Rate (%): 100.0
Model cardFace analysis
478 facial landmark coordinates
- Includes
- Eye blink detection (binary). Talking detection (binary).
- Works when
- Face is visible, unobstructed, and well illuminated.
Facial expression classification with probabilities across anger, contempt, disgust, fear, happiness, sadness, surprise, and neutral.
Does not work when: Face is significantly rotated and not approximately orthogonal to the camera.
Face landmark numbering referenceModel cards
Each model card explains the testing conditions: the people tested, the reference instruments and the error against them.
See all model cardsFitzpatrick skin types
Subjects in each model card
I
II
III
IV
V
VI
- Pulse rate and pressure waveform
- 118 subjects
- Breathing
- 93 subjects
- HRV
- 118 subjects
Tested across skin types
Every model card includes subjects from all six Fitzpatrick skin types.
Capabilities
Discover what you can measure.
Add contactless health monitoring to your product with SmartSpectra. One SDK uses standard cameras to measure heart and breathing rates, capture physiological waveforms and analyze facial expressions, with no wearables or specialized hardware needed.
Heart rate
Pulse waveform
Heart rate variability (HRV)
Blood pressure changes (uncalibrated)
Respiratory rate
Micro-expressions & facial action units
Lip & speech activity
Blink rate & eye tracking
Vital signs & breathingFacial expressions & speech
Vital signs & breathing
- Heart rate
- Respiratory rate
- Heart rate variability (HRV)
- Blood pressure changes (uncalibrated)
- Pulse waveform
Facial expressions & speech
- Micro-expressions & facial action units
- Lip & speech activity
- Blink rate & eye tracking
See contactless vitals in action
Get to know us.
See how Presage turns ordinary video into vital signs, from guided check-ins with eSSESSMENT to contactless measurements in your own app with the SmartSpectra SDK.
Pricing
Start free. Scale when you’re ready.
Both start free. After that, eSSESSMENT is $10 per additional active participant per month, and the SDK is priced for your volume.
eSSESSMENT
For researchers and teamsLabs, coaches and research teams running studies and check-ins.
Free to startthen $10 per participant per month
- Free for your first 3 active participants each month
- Participants never pay
- Team seats and programs are unlimited
No credit card needed to start. Active participant is defined as anyone who completes an activity that month, your team included.
Start freeSmartSpectra SDK
For app owners and developersApp and product teams adding contactless vitals to their platform.
Free trialthen priced for your volume
- Full SDK on iOS, Android, Linux, macOS, and Windows
- Vitals, AI insights, storage, and reference data
- No credit card required. In production: SSO, audit logs, FHIR, and an uptime SLA, plus government and on-premise deployments. Production pricing: team@presagetech.com.
Frequently asked questions
SmartSpectra Vital Signs Monitor 1.0 is FDA 510(k) cleared (K254169) for contactless measurement of pulse rate and respiratory rate. All other Presage products, including the SmartSpectra SDK, eSSESSMENT and Coherence, are for general wellness and research use.
eSSESSMENT runs your protocol on participants' own phones. Build it as a program of questions, guided breathing activities and optional camera readings of pulse rate, breathing rate and more. Participants run it in a few minutes in the free Coherence app, with no wearable devices to put on or charge, and your team can review every completed session. See eSSESSMENT.
SmartSpectra is a contactless sensing SDK that turns any camera into a real-time biometric sensor. It tracks facial and chest movements to extract anonymized health metrics including pulse rate, breathing rate, HRV, and more, all without wearables or physical contact.
Heart rate and respiratory rate, heart rate variability, blood pressure changes (uncalibrated) and the pulse waveform, plus micro-expressions and facial action units, lip and speech activity, and blink rate and eye tracking. Read how a phone camera measures heart rate.
Pulse rate is within ±0.36 beats per minute and breathing rate within ±0.37 breaths per minute on average (mean absolute error at an 80% return rate, from our model cards). Accuracy depends on lighting and motion. Each heart and breathing reading comes with a confidence score for signal quality.
iOS (Swift), Android (Kotlin), C++ on Linux, macOS and Windows, and Node.js with TypeScript. Install with your package manager, and find samples on GitHub.
Yes. The free trial requires no credit card and includes every piece of the platform: all SDK features, LLM insights, storage and reference data, plus community support on Discord. eSSESSMENT is free for your first 3 active participants each month, then $10 per additional active participant per month. For production apps, contact team@presagetech.com.
No developer? No problem. We can host your activities for your users in the Coherence app, with no coding required. See eSSESSMENT, or contact team@presagetech.com.
Still have questions? Email support@presagetech.com
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