The Visible app is designed to help people manage that process by collecting data every day in order to understand how their symptoms change. Users can measure their heart rate variability by placing a finger over their phone's camera. The user's skin color is recorded to measure the pulse.
The user uses a scale of 0 to 3 to rate the severity of their symptoms in the evening. According to research by the American Heart Association, people with long covid are more likely to have reduced heart rate variability.
When someone is likely to become fatigued, it's easier to track heart rate variability. In order to help users decide when to take it easy, Visible uses this data to create a "pace score" of 1 to 10 (8-10 indicating good recent pacing, 3-6 suggesting it would be wise to factor in a quiet next few days, and 1-2 meaning the person should prioritize rest)
Harry Leeming, who has been living with covid since September 2020, hopes that it will help both users and the society gain a better understanding of the condition. The company says that users will soon be able to share their data with researchers.
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