Wellify serves as your reliable health assistant, helping you monitor your heart rate, observe trends in blood pressure and blood sugar, and manage your daily calorie intake. Explore personalized, AI-generated recipe ideas designed to support healthier living. For any health-related issues, please consult a qualified healthcare provider.
Not a Substitute for Medical Advice
The content within this app offers general health-related information and is not intended to replace professional medical advice, diagnosis, or treatment. Always seek guidance from a licensed healthcare provider for any medical concerns.
Information Accuracy
We make every effort to ensure the information provided is current and accurate, but we cannot guarantee its completeness or correctness at all times.
Limitation of Liability
We are not responsible for any health outcomes or consequences arising from the use of app features, including health tracking tools and lifestyle suggestions.
Third-Party Services
The app may contain links to external services. We do not take responsibility for the accuracy or reliability of any third-party content or platforms.
User Responsibility
You are encouraged to verify the information provided and consult a medical professional before making any health-related decisions or lifestyle changes.
The app uses contact photoplethysmography (PPG), a method that leverages your device’s built-in camera to detect blood volume changes beneath the skin. When you place your fingertip over the camera lens, the app measures variations in light reflection caused by the pulsing of arterial blood. As your heart beats, blood flow—and thus light absorption—increases; between beats, both decrease. This rhythmic fluctuation allows the app to interpret and calculate your pulse in real time with precision.
To learn more about PPG technology, visit:
https://en.wikipedia.org/wiki/Photoplethysmogram
The app stores heart rate data locally and presents results based on the selected detection mode and timing of measurement.
Reference Range
As noted by the American Heart Association, a normal resting heart rate for adults typically falls between 60 and 100 beats per minute. This range serves as a standard baseline for evaluating your heart rate readings.
Tailored Suggestions
We offer guidance based on heart rate patterns in various situations. However, personal factors—such as your sex, fitness level, and overall health—may influence outcomes. These recommendations are for general wellness support and are not intended to replace medical advice.
Key Reminders
Before acting on any exercise tips or routine changes suggested by the app, consider your personal health condition and potential risks. We strongly advise consulting a healthcare provider prior to making significant lifestyle adjustments.
We are committed to delivering trustworthy and up-to-date insights by drawing from credible sources and medical expertise to help you manage your health more confidently.
Pulse refers to the number of heartbeats per minute (bpm), representing the heart’s rhythmic contractions. It adjusts based on the body’s demand for oxygen and can be affected by factors such as genetics, physical fitness, stress levels, diet, medications, hormones, and overall health. Typically, it aligns with the heart rate measured at areas like the wrist or neck.
Heart Rate Variability (HRV) refers to the fluctuations in the time intervals between consecutive heartbeats. It reflects how efficiently your autonomic nervous system functions—this system governs vital processes such as heart rhythm, breathing, and digestion. Generally, higher HRV is associated with greater resilience and better overall health, while lower HRV may point to elevated stress levels or potential health issues.
Learn more:
https://pmc.ncbi.nlm.nih.gov/articles/PMC5624990
Stress is the body’s natural reaction to challenges—be they physical, emotional, or environmental. It activates the sympathetic nervous system, which triggers the "fight or flight" response. While helpful short term, ongoing stress can disrupt your body’s balance and impact long-term health.
HRV acts as a meaningful measure of how your body manages and recovers from stress. A high HRV indicates a responsive and adaptable nervous system, while a low HRV can suggest chronic stress, poor recovery, or potential underlying conditions.
Learn more:
https://intelliprove.com/uploads/pi-2017-08-17-1.pdf
In human physiology, energy refers to your body’s ability to carry out physical, mental, and emotional activities. It is shaped by factors such as metabolism, stress, and recovery. Heart Rate Variability (HRV) is a key marker of how well your body manages energy—indicating how effectively the autonomic nervous system switches between conserving and using energy.
A higher HRV suggests a balanced system with strong energy reserves and adaptability. In contrast, a lower HRV may reflect fatigue, chronic stress, or impaired recovery, pointing to reduced energy availability.
Understanding the HRV-energy connection can help you manage stress better and boost overall performance.
Learn more:
https://pmc.ncbi.nlm.nih.gov/articles/PMC5624990
Blood pressure measures the force of blood pushing against the walls of your arteries. It’s recorded in millimeters of mercury (mmHg) and shown as two numbers:
• Systolic pressure: Pressure during heartbeats (normal: 90–120 mmHg)
• Diastolic pressure: Pressure between beats (normal: 60–80 mmHg)
Blood pressure categories:
Normal: Systolic <120 mmHg and Diastolic <80 mmHg
Elevated: Systolic 120–129 mmHg and Diastolic <80 mmHg
Stage 1 Hypertension: Systolic 130–139 mmHg or Diastolic 80–89 mmHg
Stage 2 Hypertension: Systolic ≥140 mmHg or Diastolic ≥90 mmHg
Hypertensive Crisis: Systolic >180 mmHg and/or Diastolic >120 mmHg (seek immediate medical help)
Maintaining healthy blood pressure is essential for heart and vascular health. Abnormal readings can increase the risk of conditions such as stroke, heart disease, or kidney failure.
Learn more:
https://www.heart.org/en/health-topics/high-blood-pressure/the-facts-about-high-blood-pressure
Our app utilizes advanced AI algorithms to estimate blood pressure through smartphone sensors, including the camera, flash, and inertial measurement unit. The key technologies involved are:
Photoplethysmography (PPG)
SCG records and analyzes the vibrations of the heart to provide detailed insights into heart health.
Seismocardiography (SCG)
SCG records and analyzes the vibrations of the heart to provide detailed insights into heart health.
Data Processing
PPG and SCG signals undergo complex signal processing and filtering techniques to extract key features related to heart activity.
AI Algorithms
By integrating clinical data and deep learning models, our AI accurately estimates systolic and diastolic blood pressure from extracted signal features. The algorithm also considers individual differences for personalized blood pressure assessment.
Learn more:
https://www.mayoclinic.org/diseases-conditions/high-blood-pressure/in-depth/blood-pressure/art-20050982
Blood glucose—also known as blood sugar—is the body’s primary energy source, derived from the food you eat. It travels through the bloodstream to fuel your cells.
Typical blood glucose levels (shown in both mg/dL and mmol/L) are:
Normal
• Fasting: 70–99 mg/dL | 3.9–5.5 mmol/L
• After meals: <140 mg/dL | <7.8 mmol/L
Prediabetes
• Fasting: 100–125 mg/dL | 5.6–6.9 mmol/L
• After meals: 140–199 mg/dL | 7.8–11.0 mmol/L
Diabetes
• Fasting: ≥126 mg/dL | ≥7.0 mmol/L
• After meals: ≥200 mg/dL | ≥11.1 mmol/L
Keeping your blood sugar within a healthy range is essential to avoid complications like diabetes, heart disease, and nerve damage. Both high (hyperglycemia) and low (hypoglycemia) levels can pose serious risks if not addressed.
Learn more:
https://www.diabetes.org/diabetes
Blood oxygen saturation (SpO₂) is a measure of how much oxygen is being carried by your red blood cells. A normal SpO₂ reading typically ranges from 95% to 100%. Levels below 95% may indicate potential health issues, and readings below 90% are considered low, necessitating medical attention.
Learn more:
https://www.health.com/blood-oxygen-level-8425396
https://www.mayoclinic.org/symptoms/hypoxemia/basics/definition/sym-20050930
Not all carbohydrates impact your blood sugar in the same way. Some foods cause a rapid spike, while others lead to a slow, steady increase. This is because carbohydrates differ in how quickly they break down and release glucose into the bloodstream.
Types of Carbohydrates
Carbohydrates are classified into three main types:
• Monosaccharides – The most basic form, including glucose and galactose, fructose, which are quickly absorbed into the blood. Fructose doesn't spike blood sugar quickly, but excessive intake can cause insulin resistance, fat buildup, and metabolic issues.
• Disaccharides – Two simple sugars linked together, such as sucrose (table sugar) and lactose (milk sugar). These need to be broken down before absorption.
• Polysaccharides – Found in foods like whole grains, beans, and vegetables. They break down more slowly, leading to a gradual rise in blood sugar.
What is the Glycemic Index (GI)?
The Glycemic Index (GI) measures how quickly a carbohydrate-containing food raises blood sugar compared to pure glucose (GI = 100).
• High GI (70-100): Causes a rapid spike (e.g., white bread, sugary drinks).
• Medium GI (56-69): Moderate impact (e.g., brown rice, sweet potatoes).
• Low GI (0-55): Slow and steady release (e.g., whole grains, legumes).
What is Glycemic Load (GL)?
The Glycemic Load (GL) considers both the GI and the actual amount of carbohydrates in a serving of food, giving a more accurate picture of its blood sugar impact.
GL Calculation:
• High GL (>20): Significant blood sugar impact.
• Medium GL (11-19): Moderate effect.
• Low GL (<10): Minimal impact.
Learn more:
https://nutritionsource.hsph.harvard.edu/carbohydrates/
https://glycemicindex.com/
https://diabetes.org/
Body Mass Index (BMI) is a simple measure using weight and height:
BMI = weight (kg) ÷ [height (m)]²
This metric helps assess body weight in relation to height.
More info:
https://www.cdc.gov/bmi/about/?CDC_AAref_Val=https://www.cdc.gov/healthyweight/assessing/bmi/index.html
Your TDEE (Total Daily Energy Expenditure) is calculated by multiplying your BMR (Basal Metabolic Rate) by your Physical Activity Level (PAL).
TDEE = BMR × PAL
Your BMR represents the calories your body needs at rest to maintain vital functions. A common formula to estimate BMR is the Mifflin-St. Jeor Equation:
• Women: BMR = 10 × weight (kg) + 6.25 × height (cm) – 5 × age (y) – 161
• Men: BMR = 10 × weight (kg) + 6.25 × height (cm) – 5 × age (y) + 5
Learn more:
https://www.sciencedirect.com/science/article/abs/pii/S0002916523166986
Your daily energy needs depend on factors like age, weight, muscle mass, and activity level. Some foods provide more calories but less nutrition, while others offer sustained energy. Our app estimates your calorie intake by analyzing personal metrics and activity data from the Health app, along with your meal logs and feedback. Over time, it recognizes patterns in how much you eat, how it relates to your goals, and where adjustments may help. These insights support balanced nutrition and more consistent energy levels—whether you’re trying to manage weight, fuel workouts, or improve metabolic health.
Learn more:
https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/basics/nutrition-basics/hlv-20049477
Calorie Goal
Well AI sets your daily calorie targets by combining your BMR with a calculated deficit. For safe and sustainable weight loss, we suggest a deficit of 150–500 calories, helping you stay full while progressing toward your goals.
Learn more:
https://pmc.ncbi.nlm.nih.gov/articles/PMC8017325
Nutrition Goal
Balanced nutrition is key to healthy weight management. Wellify offers personalized nutritional targets based on your physical profile and calorie needs.
Explore more:
https://pmc.ncbi.nlm.nih.gov/articles/PMC8017325
Stress can influence how you think, feel, and function in daily life. Our app evaluates your stress level through a targeted questionnaire that explores how often you’ve felt tense, anxious, overwhelmed, or physically affected by stress over the past month. It also asks about your ability to relax, sleep quality, emotional regulation, coping habits, and whether you’ve sought support or withdrawn from others. These responses help us identify patterns of acute or chronic stress and how they may be affecting your well-being. Based on your results, the app provides personalized suggestions to help you manage stress more effectively and improve emotional resilience.
Learn more:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5579396/
Sleep quality is analyzed by integrating Health app data—like resting heart rate, HRV, and movement—alongside your own sleep test, including bedtime, wake time, and perceived restfulness. This combined data helps identify how well your body recovers overnight. Low nighttime HRV or elevated heart rate might signal restless sleep or late-evening stress. Over time, you’ll receive personalized insights to help improve sleep consistency, depth, and overall recovery. Healthy sleep supports immunity, mood balance, blood pressure regulation, and metabolic health, making it a key focus of your wellness plan.
Learn more:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6145830/
We assess your fitness status using Health app data—such as heart rate, exercise duration, type of activity, and intensity. The app detects how well your body is adapting to physical activity through markers like HRV recovery, resting heart rate, and training load. Whether you’re walking, doing strength training, or completing a high-intensity workout, we help you balance exertion with rest. Overtraining, fatigue, and under-recovery are flagged, so you can adjust early.
Learn more:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6950543/
Your weekly meal plan is personalized based on your body metrics, activity levels from the Health app, and your nutritional preferences collected through onboarding questions. Our AI designs meals that match your calorie goals and include the right balance of macronutrients—protein, fats, and carbohydrates—while supporting blood sugar control and satiety. We also consider food variety, digestion, and convenience to ensure your meals are both enjoyable and sustainable. Each week, you receive a structured yet flexible plan to help you stay on track with your health and energy goals.
Learn more:
https://www.hsph.harvard.edu/nutritionsource/healthy-eating-plate/
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If you have any questions or feedback, feel free to reach out anytime.