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No apps can cure or prevent diseases. If one needs medical help help than a doctor is what they need. We should be very careful about our health. If we feel the need, then a professional medical advice from a doctor should be sought. 

Many advertisements for apps and devices are made in the market that suggest that they might help during a disease, Please bear in mind that these apps can assist you with the timings for diet and medication. They can also assist you in getting in contact with the hospital in case of emergency. 

Beyond that, you are yourself responsible for your own health.

The closest app I could think of to this, all the while have the chance to earn some money is the ACTIFIT app.

The ActiFit app is like one's personal EXERCISE or daily routine diary. It tells you how much you have moved and more. Basically it's an app that incentivizes exercising and working out. And from we all know, Exercising and working out lessens the chance of having a heart attack.

There is an app called actifit and they have a profile on steemit,well the app is not an app directly meant for

heart disease but the app is made to help you stay physically fit by encouraging you to do excercises and

even give you rewards for staying fit,when someone is doing regular excercise it can make the person to be

able to boost their immune system and when an immune system is strong it could make the person to

have the ability to fight any form of disease or prevent any form of disease...

I did my research and i found out list of apps which can be used to fight heart disease..

Cardiio

This clever app can measure both a patient's heart rate and overall level of cardiovascular health and fitness, AARP explained, which is ideal for patients experiencing heart disease. Designed by technology specialists at leading higher education institutions Harvard and MIT, Cardiio is unique in that it employs the smart phone camera to take its measurements. Effective and affordable, the source noted that app costs $2.99.

2. Blood Pressure Companion

A steal at just 99 cents, the Blood Pressure Companion is available on the iPhone. According to Healthline, the app makes recordings of a patient's heart rate and blood pressure, before storing the information in a special data base. The patient can then utilize the app to make note of any drastic changes or readings that may be a cause for concern. Better still, for forgetful patients, the app can send reminders when a reading is overdue.

3. The Healthy Heart Meal Planner

Designed by the Heart Foundation, the Healthy Heart Meal Planner app allows users to create healthy and balanced weekly meal plans, while offering general advice on the kinds of foods that are ideal for a balanced diet, the Heart Foundation website reported. The app uses a 'healthy heart' symbol that fills up as users add more meal ideas and recipes. The heart symbol also indicates whether the choices are indeed healthy and balanced.

4. ASCD Risk Estimator

This app, designed by researchers at both the American College of Cardiology and the American Heart Association, can be used to assess individual risk for atherosclerotic cardiovascular disease, Healthline detailed. The app uses a number of metrics - such as the user's weight, blood pressure, age and lifestyle habits - to ascertain his or her overall risk level for the condition. The app provides results in two risk categories: Lifetime risk and risk within the next decade. If a user is presented with concerning results, he or she will be able to consult with a physician or cardiovascular specialist for further guidance. This app is ideal for all individuals, regardless of age and health, and best of all it's completely free.

5. AliveCor ECG Heart Monitor

Easily the most expensive app on the list at $200, the AliveCor ECG Heart Monitor is an amazingly beneficial tool for patients with a history of cardiovascular problems. AARP explained that the app can be used to monitor electrical patterns in the heart and alert users to any potential problems and abnormalities. It is so helpful because a patient can alert a physician to any problems early, which in turn could potentially stop the occurrence of a catastrophic event, such as a heart attack or stroke.