Frequently Asked Questions


What are the benefits of Anura™?
  • Contactless – No sensor or additional equipment needed. Measurement is taken just like a selfie!

  • Quick – A measurement only takes 30 seconds

  • Results – Measure your general wellness

  • Tracking – A history of your measurements is saved, and you can share your results (should you choose) with your family and friends

  • Private – No images or videos 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 or similar institutions.

  • Know your wellness – Use Anura™ often to increase your awareness of general wellness

  • The app is completely free!


How can I download the app?

Instructions by device type:

iOS: Go to the Apple App Store on your mobile device, search, and select “Anura.” Tap “Get,” followed by “Install,” and enter your device password (or Touch ID, if available on your device).

Android: Go to the Google Play Store on your mobile device, search “Anura,” select it, and tap “Install.”

Or click here:

iOS | Android

Is Anura™ free?

Yes, Anura is completely free to use.

How to take a measurement?

To take a measurement, open the app, you’ll see the measuring screen. Follow the instructions below:

  • Choose a well-lit area and sit comfortably. Make sure the phone and face are on the same level

  • Make sure the light is evenly distributed on the face for best results. Keep your face centred within the outline throughout the measurement

  • When the measurement has started, sit still for 30 seconds until the measurement is completed.


How to view my measurement history?

It is important to track and monitor your health to see how it changes over time. With Anura, you can see your measurement history by going to the measuring screen and tapping the bottom left icon (see red arrow).

Can I connect Anura to my fitness tracker?

Our team is working hard to make it happen, so please be patient with us!

Is Anura™ a medical device?

Anura is strictly intended for informational and educational purposes and to promote general wellness. The measurement results provided to you should not be treated as medical advice or to diagnose, treat, cure or prevent any disease, ailment or injury. Should you have any health-related questions, please call or see your physician or other medical professionals.

Is Anura™ available for my device?

The Anura app is available for iOS and Android handset/mobile devices. For personal use, the general smartphone camera will be able to use the app. Anura works best with the following mobile phones:

  • Apple iPhone 6 and up , iOS 11.4 or later

  • Android phones that support Camera 2 API

For iOS based models, Anura works best on iPhone6 handsets and higher. Anura™ has been validated on the following Android platforms:

  • Google Pixel 3 Android v9.0.0, API 28

  • Google Pixel 2 Android v9.0.0, API 28

  • HONOR 8C Android v8.1.0 API 27

  • Huawei Nova2S Android v8.0.0, API 26

  • Huawei P20 Pro Android v8.1.0 API 27

  • Huawei P30 Pro Android v8.1.0 API 27

  • LG G5 Android v7.0, API 24

  • LG V30 Android v8.0.0, API 26

  • Oppo R17 Android v8.1.0, API 27

  • Samsung Galaxy S9 Android v9.0.0 API 28

  • ViVo X23 Android v8.1.0, API 27


What does the SNR displayed at the top of the results page mean?

“SNR” stands for “Signal-to-Noise Ratio”, which indicates the quality and purity of the extracted Facial Blood-Flow data. The higher the number, the better the quality of your measurement.

SNR is expressed in logarithmic units of dB (decibels). Anura calculates the SNR by comparing the facial blood flow level (as a separated signal) against the background level (noise floor) and representing the quality as the log ratio of these two levels.

Why does my measurement get cancelled?

Measurements are cancelled when the video is unstable. This can be because of lighting or movement. To prevent this from happening, stabilize the phone by holding it steadily, adjust your lighting (to make sure light is not flickering, there are no shadows, etc.), and adjust your face angle (to make sure light is hitting your face evenly).

What are the lighting requirements for Anura?

Anura works best in good light conditions, where light is evenly distributed across the face without any shadows. If you have trouble achieving this indoors, please try to use a phone stand and selfie light. Try to avoid direct light to the face, backlight and uneven light distribution.

What are the position and angle requirements for Anura?

Just as when you’re at the doctor’s, please sit comfortably before using Anura. Hold the phone directly in front of you or use a phone a stand when measuring. Try to limit any movement during the measurement and keep your face within the white outline. Do not hold the phone from above or below during the measurement.

I found a problem with the app, how do I report it?

You can send an email to us at Please include screenshots if you have them and describe the issue with as much detail as possible. This will help us pinpoint the problem more effectively.


What does Heart Rate mean on Anura?

A range of 60 to 100 beats per minute (bpm) is considered a normal range for an adult’s resting heart rate. Generally, a lower heart rate at rest implies more efficient heart function and better cardiovascular fitness.

What are the five stars on the measurement result?

Anura uses a 5-star rating system to let you know the quality of your measurement based on the lighting conditions that illuminate your face.

4 – 5 stars : Good lighting conditions. You have well-lit conditions and the light is spread evenly (i.e. no shadows) across your face.

2 – 3 stars : Adequate light conditions. The light on your face is sufficient enough (i.e. not too low) and spread evenly enough across your face.

1 star : Poor lighting conditions. The light on your face is too low and uneven or there was too much movement after the measurement started.

What does a low (or high) Heart Rate result from Anura™ mean?

The Anura™ heart rate result is calibrated to align with the medically indicated ranges for the human resting heart rate. The medically indicated range for a “normal” resting heart rate lies between 60 bpm and 100 bpm. When Anura™ measures a heart rate that falls lower than 60 bpm, the result will be indicated on the “below normal” range (Bradycardia). When Anura™ measures a heart rate that is above 100 bpm, the result will be indicated on the “above normal” range (Tachycardia).

What does a low (or high) Stress Index result from Anura™ mean?

Green region – A well below normal stress results in a very low Anura Stress Index (ASI) that is ideal for maintaining good mental and physical health.

  • An ASI reading this low suggests the possibility that at this moment, you have nothing to worry about in your life or are in a state of deep relaxation

  • However, you may also not be experiencing enough mental arousal to keep you alert in certain tasks. Minimum stress is useful while engaged with daily activities or chores

Light green region – Your below normal stress reading results in a lower Anura Stress Index (ASI) that is beneficial for long term psychological and physical health

  • Receiving ASI readings in this zone are most suitable for the home or leisure environments

  • The ability to activate this lower level of mental arousal may facilitate concentration in difficult or unfamiliar tasks

Yellow region – Currently, your normal stress results in a moderate Anura Stress Index (ASI) that is not considered harmful to your psychological and physical health

  • Most people work optimally having an ASI within this stress zone

  • However, if your stress remains within this zone under all situations, including moments of relaxation, then you may benefit from learning effective relaxation techniques

Pink region – Experiencing higher than normal stress resulting in a higher Anura Stress Index (ASI) that allows you to improve short term performance by boosting your motivation to do more difficult tasks, particularly those requiring stamina or persistence

  • During exposure to this level of stress, you may experience mental or physical strain

  • However, ASI readings in this zone should not be a constant part of your life. Otherwise, it may negatively affect your long term psychological and physical health outcomes

Red region – You are experiencing a significantly higher than normal stress indicated by a very high Anura Stress Index (ASI) meaning that you will likely encounter impaired performance on certain tasks due to higher than normal anxiety

  • You may feel unable to calm yourself. Stop what you are doing and take slow, deep breaths. You should also avoid drinking caffeinated beverages like coffee

  • Reducing the causes of your stress and engaging in calming activities may help restore your stress balance including practicing deep breathing, yoga, or meditation daily

  • Be aware that prolonged periods of time spent experiencing such elevated ASI readings have the potential to cause health complications

Note: Just as your resting heart rate can vary constantly it is also normal for stress levels to change constantly. This is because your heart rate variability (HRV) is also changing constantly. As a result, it is not unusual to experience variations in your Anura Stress Index results by as much as 1.0 when you take consecutive measurements.

My stress index is always in the yellow region, should I be worried?

Don’t worry too much. The value of psychological stress in the yellow range indicates that you have normal psychological stress and your physical and mental health is stable. Most people in this interval will show the best working condition. When in non life-threatening situations, stress can motivate people in certain situations, such as when they need to take a test or interview for a new job.


What is the accuracy of Anura's Heart Rate measurement?

The Anura™ heart-rate measurements are accurate to within +/- 1 bpm when compared against electrocardiogram (ECG) measurements.

For evidence-based research, please read our publication on Transdermal optical imaging revealed different spatiotemporal patterns of facial cardiovascular activities.

How does Anura™ measure and rate my stress level?
  • Heart rate variability (HRV) is the observation of your sympathetic/autonomic nervous system. HRV has been a reliable indicator to measure stress. Existing methods for assessing HRV are ECG or PPG. Using TOI, we can measure HRV contactless-ly and non-invasively.

    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 models of stress to derive a ground truth, then compared it with TOI signal results.

    We then converted these values into a stress index with 5 levels, where 1 is the lowest and 4.9 is the highest. The difference between each level represents one standard deviation.

    If you’re interested in learning more, you can read our research publication Transdermal Optical Imaging reveal basal stress via heart rate variability analysis: A novel methodology comparable to electrocardiography.

How is Anura able to measure blood pressure?
  • We first used the traditional contact method to measure blood pressure of a large sample, which includes medical professionals, cuff, additional pump, stethoscope and sphygmomanometer. Then we use these data to generate a blood pressure model, to produce a ground truth.

    At the same time, we use our Transdermal Optical Imaging (TOI ™) technique to obtain facial blood flow information and send it securely to the cloud, which is processed by our Affective AI engine Deepaffex ™, which uses advanced signal processing and deep learning artificial intelligence model for calculating blood pressure.

    Then we used the data and compared it with the ground truth, and found that the results generated by Deepaffex ™ were relatively accurate.

    If you are interested in further study of this study, please read our research paper published in the Journal of Circulation: Cardiovascular Imaging of the American Heart Association, titled “Smartphone-Based Blood Pressure Measurement Using Transdermal Optical Imaging Technology“.

Why do my Anura results greatly differ every time?

Anura results may differ since your body is constantly changing. There are many contributing factors to influence your results such as: if you are sitting vs standing, your posture, lighting and the light direction, the distance of your face from the camera, your face angle, Internet connection and beverage and/or food intake, etc.

Has your product been certified by an authoritative organization?

We have a patent in Heart Rate tracking and Blood Pressure determination.

06/11/2018 | System and Method for Camera-Based Heartrate Tracking | Patent No. US 10,117,588 B2

13/08/2019 | System and Method for Contactless Blood Pressure Determination | Patent No. US 10,376,192 B2

We have research publications as well; our papers are published on international journals, so far we’ve validated TOI for Heart Rate, stress measurement, and blood pressure.

Frontiers in Psychology: Transdermal Optical Imaging Reveal Basal Stress via Heart Rate Variability Analysis: A Novel Methodology Comparable to Electrocardiograph

Nature Scientific Reports: Transdermal optical imaging revealed different spatiotemporal patterns of facial cardiovascular activities

American Heart Association’s Circulation: Cardiovascular Imaging journal: Smartphone-Based Blood Pressure Measurement Using Transdermal Optical Imaging Technology

Springer: Measuring Blood Pressure: from Cuff to Smartphone

See our Research page, for more details.

Anura also received coverage from international media outlets like Bloomberg, Forbes, New York Post, DailyMail UK, The Globe and Mail and many more. See the full list here.

You mentioned a lot about "Affective AI", what is the specific direction of your products for "affects"?

In most cases, people do not visibly show their emotions on their faces, this makes it hard for other people to detect their emotions. TOI™ can extract the inner emotional experience of a person by analyzing their physiology. We have done research and built a model to detect emotions through a person’s physiology.

Therefore, with our technology, one-day robots will be able to detect human “real” feelings, detect stress, and send out anxiety alerts. This will allow Anura to gradually release the functions related to mental health, making it easier for everyone to not only take care about themselves, but also the physical and mental health of the people around them


What kind of face recognition technology is Anura used?

Anura does not use face recognition. Our Transdermal Optical Imaging (TOI ™) collects blood flow information under the skin of the face. The data uploaded to our emotional artificial intelligence cloud engine does not contain any images and videos, so users can use the app at ease.

Where will my photos or video being saved or sent?

We care about your privacy. When taking a measurement with Anura, your images or videos will not be saved on your device nor transmitted as part of the data for calculating the results, please be rest assured. Read more about our latest Privacy Policy.

What personal information do we collect?

Whenever you access or use our Services, you may be asked to provide, or we may collect, your Personal Physical, Biometric and Health Information including without limitation facial features, facial blood flow, your age, weight, height, and gender.

See details on our Privacy Policy I. WHAT INFORMATION WE COLLECT

Why do we collect personal information?

We use the Personal Information you provide or which we collect mainly for the following purposes:

Service Provision

The core functions of our Services would not be made available to you unless we collect, process and use the relevant Personal Information about you. For example, we need to collect, process and analyze your personal facial features, facial blood flow and other relevant information to provide you with the Measurements.

Product and Service Development

We may also use your Personal Information for the following purposes, to which you expressly consent: – to improve and enhance our Services; – to provide you with product and service updates; – to troubleshoot and protect against errors; and more.

Safety and Security

We may use your Personal Information to promote the safety and security of our Services. For example, we may use your Personal Information to authenticate users, detect and protect against fraud and abuse and other criminal activity, respond to a legal request or claim, and enforce our Terms of Use and policies.

See details on our Privacy Policy II. HOW WE USE YOUR PERSONAL DATA

How do we protect your persional information?

We take various steps to protect your Personal Information from unauthorized access, use or modification and unlawful destruction and disclosure, for example:

  • we adopt encryption technology (such as SSL) to transfer and store your Personal Information;

  • we limit the access to your Personal Information on a strict need-to-know basis;

  • we put in place physical, electronic, and procedural safeguards in line with industry standard. Please be aware that, despite our efforts, we do not warrant or guarantee that unauthorized access will never occur as no method of transmitting or storing information is completely secure.



Do we disclose your personal information to third-party marketers?

We may also use your Personal Information to create segment data, user group profiles or otherwise create anonymous, aggregated statistics about the use of our Services, which we may share with third parties (such as our partners, advertisers, industry bodies, the media and/or the general public) and/or make available to the public. We only share a user’s personal information with third parties in limited circumstances. Even when we do share information, we will only collect information pertinent to the appropriate purpose.

How long is information retention and where they are stored?

Information Retention

To protect your privacy, certain information that we collect which can identify you as an individual will not be stored. In particular we do not store your facial image or video recordings on the device in which Anura is installed nor on the cloud. With regard to the Measurements, we store them on our servers or with cloud server providers managed by us, but in an anonymized form.

We will retain your Personal Information for as long as is reasonably necessary for the various purposes set out in Section II above or to otherwise comply with any applicable laws and regulations concerning the mandatory retention of specific types of Personal Information.

We will retain your information for as long as your account is active or as needed to provide you services. We will retain and use your information as necessary to comply with our legal obligations, resolve disputes, and enforce our agreements; this retention period may extend past the point at which you close your account.

Information Storage

All information processed and collected to provide our Services outside of the device in which Anura is installed is stored on our servers or with cloud service providers managed by us located in the United States of America.

See details on our Privacy Policy V. INFORMATION RETENTION AND STORAGE


How we share your personal data?

In general, we do not disclose the Personal Information about you to third parties without your consent or otherwise as specified in this Policy. We may disclose or share your Personal Information in the following circumstances:

Sharing of Personal Information by Nuralogix

We may disclose or share your Personal Information with third parties only in the ways described in this Policy, including as follows: In certain situations, NuraLogix may be required to disclose personal data in response to lawful requests by public authorities, including to meet national security or law enforcement requirements. NuraLogix may disclose your Personal Information (i) to any governmental authority as part of an investigation to determine our compliance with any applicable law, rule, or regulation (including privacy laws, rules, and regulations), (ii) in response to a court order, subpoena, discovery request, or other lawful judicial or administrative proceeding, (iii) as otherwise required or permitted under any applicable law, rule, or regulation, (iv) in good faith, to protect or defend the rights or property of NuraLogix and other users, and (e) if NuraLogix is involved in a merger, acquisition, or sale of all or a portion of its assets, you will be notified via email and/or a prominent notice on our Site of any change in ownership or uses of your Personal Information, as well as any choices you may have regarding your Personal Information; third party service providers: we may use third party service providers to provide certain data processing services for us (acting as our authorized data processors). Examples of authorized data processors could include: currently we use Amazon Web Services in the United States of America to help process and extract certain personal data collected during the Services which will in turn empower the function of Anura. When acting as our authorized data processors, they are required to only process data in accordance with our instructions, in line with this Policy, and are subject to appropriate confidentiality and security obligations. we may share anonymous, aggregate or generic data with third parties (such as our partners, advertisers, industry bodies, the media and/or the general public) for example, in public reports about stress and health or to partners under agreement with us. However, in these situations we do not disclose any information that could be used to identify you personally.

Shared Information

Our Services allow you to upload and share your Measurements in various forms with others and/or create a publicly accessible profile for your account. For example: The communities and forums area (where applicable) of our websites allows you to post comments (with your account name), which are visible to other users of that service; Other services allow you to share a link which if clicked on may allow the recipient to access your uploaded content. Your Personal Information could be also shared by you, if you and other users are using and logging onto a same family/enterprise version of Anura (where available) whereby certain user(s) or the administrator user of such version of Anura (subject to specific settings made and/or availability of relevant functions) would have access to the Measurement results or information of the other users.

Any Personal Information shared by you in the above circumstances shall be deemed to have been done with your explicit consent. Please consider carefully whether or not you desire to share your Personal Information as described above.

See details on our Privacy Policy III. HOW WE SHARE YOUR PERSONAL DATA

What is your privacy policy for children?

Our Services are not intended for minors. Person under the age of 18 must not use our Services without obtaining parental/guardian consents to this Policy (both for themselves and on your behalf). We do not knowingly collect Personal Information from any person under the age of 18 without such consent.

For details, see our Privacy Policy VIII. PRIVACY POLICY FOR CHILDREN

How can I delete my account?

To know about account deletion, please refer to the delete account page.