Anura™ is a general wellness app.

By using your phone’s video camera, Anura™ can measure, track and record your resting heart rate and stress level based on the blood flow in your face.

Anura™ is now available for iOS and Android:


Anura is only intended for informational and educational purposes to promote general wellness. The estimated measurements provided to you should not be treated as medical advice or used to diagnose, treat, cure or prevent and disease, ailment or injury. Should you have any health-related questions, please call or see your physician or other medical professional.
Works best with: iPhone 6s and higher.

Features and Benefits
  • Contactless – No sensors to touch. Measurements are taken just like a selfie!
  • Quick – A measurement only takes 30 seconds.
  • Measure your resting heart rate and stress level. Our Anura Stress Index (ASI) can help you quantify and monitor your stress over time.
  • A history of your measurements is saved, and you can share your results (should you choose) with your family, friends or doctor.
  • Private – No images or video are saved on your device or transmitted as part of a measurement. Your blood flow information is encrypted when sent to our cloud servers for analysis and your measurement history is stored using the same encryption techniques that are used by banks.
  • Use Anura™ often to increase your awareness of stress and general health. Completely free!
  • Human skin is translucent.
  • Light and its respective wavelengths are reflected at different layers below the skin and can be used to reveal blood flow information in the human face.
  • This information is contained in conventional videos.
  • A technique known as Transdermal Optical Imaging (TOI™) is used to extract blood flow information from the video. This technique was developed by our team of neuroscience, psychology, physiology, signal processing and deep learning experts.
  • Anura™ uses your phone’s video camera to extract and send encrypted blood flow information (no video or photo) to the cloud to be processed by our DeepAffex™ Affective Intelligence engine.
  • DeepAffex™ applies advanced signal processing and AI models to predict your resting heart rate and stress, then sends these results back to Anura.
  • We began by taking continuous heart rate measurements of a large sample using traditional, contact-based methods (e.g. EKG). We then used this data to generate 3-D models of stress to derive a ground truth measure of stress using three dimensions.
  • Using TOI™ signals, we obtain heart rate variability (HRV) measures based on time domain, frequency domain, statistical, dynamic systems, and nonlinear methods extracting over 20 features.
  • By applying advanced machine learning techniques and other statistical methods, we maximized the correspondence between the more than 20 features extracted from the 30 second TOI™ signal and the ground truth.
  • We then computed the statistical means and standard deviations of the predicted stress values to create a norm based on a Gaussian distribution.
  • Finally, we converted the predicted stress values into a stress index with 5 levels where 1 is the lowest and 5 is the highest. The difference between each level represents one standard deviation.

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