Overview
The Stability Score is a daily snapshot of your body’s signals
1 is the lowest score, indicating a need to rest
5 is the highest, which indicates that your body is looking more stable
The 7-day charts give you a view of how your signals have been changing recently
The score is a tool to help you make informed pacing decisions
Use the Stability Score to help guide your pacing and make more confident decisions about rest and activity. It's a data-based snapshot of your body’s stability, not a measure of your overall wellness or how you feel. A stable score doesn't guarantee you'll feel good, and an unstable score doesn't necessarily mean something is wrong.
Your Stability Score ranges from 1 to 5
Your Stability Score brings together your resting heart rate and heart rate variability (HRV) plus your self reported ratings for sleep and symptoms. It gives you a score from 1 to 5 showing how steady your signals are.
Out of balance - Your body’s signals are indicating reduced resilience. This is usually a strong sign that your body needs to rest today.
Out of balance - At least one of your body’s signals is unstable. This is usually a sign that a quieter, more restful day would be helpful.
Slightly out of balance - Your body’s signals are close to their average or there are mixed signals. This means that your body is no more or less resilient than an average day for you. Keep pacing today, if you can.
Stable - At least one of the factors that contribute to your score is positive, compared to your typical range.
Stable and improving - Multiple signals are looking good today.
Your Stability Score breakdown
Tapping on the cards Resting heart rate, HRV, Sleep or Symptoms will expand the card to show your data over the last seven days as well as your normal range for the past 90 days.
Tap anywhere on a chart to see the rounded numbers or ratings for each day.
Whether your Stability Score is calculated using a morning reading or overnight measurements, your resting heart rate (HR) and heart rate variability (HRV) readings are always rounded when displayed in the app.
Larger changes from your normal range have a bigger effect on your score
The Stability Score calculation looks at how far each factor is from your average over the last 90 days. And whether any changes signal greater or lower stability. This means the effect of each factor on your score will vary from day to day.
For resting heart rate and HRV, Stability looks at whether today’s measurement is within, lower, higher, or much higher than your normal range.
For sleep and symptoms, Stability Score looks at whether it’s around, better, or worse than your average.
How each factor signals greater stability
Each factor is scored independently. It’s important to understand that in some cases, a higher number is better, and in others, a lower number is better. Let’s break it down:
Resting heart rate
In chronic illness, your resting heart rate tends to run higher when your body is under strain, and lower when you’re better recovered.
A resting heart rate within or lower than your normal range is generally a good sign of stability.
Heart rate variability
Heart rate variability (HRV) can be a useful indicator of your wellbeing over time.
HRV above average is often a sign of better recovery
Reduced HRV can be a predictor of fatigue severity
Large upward swings in HRV signal instability
Steadily increasing HRV over time generally points to increasing resilience.
Sleep
Sleep is scored based on both how you felt after last night’s sleep and how it compares with your usual pattern. A bad night’s sleep can still signal lower stability, even if it’s typical for you.
Symptom severity
Symptom severity lower than usual is a signal of greater stability, while higher symptom severity can signal lower stability.
You can add or remove symptoms you track at any time by going to Profile → Trackers.
If you forget to do your Evening Check-in, your score will be calculated using the other three factors: resting heart rate, heart rate variability (HRV), and sleep quality.
If you are concerned about your score
Look at your trends over a longer period of time, rather than focusing on a single reading, or the last 7 days. A steady decline in heart rate variability (HRV) could signal your body is struggling to recover or handle stress.
This score is a pacing support tool. It helps guide you towards when to prioritize recovery, but it’s not intended to diagnose or provide medical advice. If you have health concerns or need guidance on how to manage your well-being, always consult with a healthcare provider.
Does a low heart rate variability in my Stability Score mean I'm going to crash or experience a worsening of symptoms?
Does a low heart rate variability in my Stability Score mean I'm going to crash or experience a worsening of symptoms?
A low heart rate variability (HRV), especially outside your normal range, can suggest your body is under extra stress from fatigue, illness, or recovery. It may indicate your body is struggling to stay in balance.
If you notice a low HRV, focusing on recovery techniques may help. For example, rest, hydration, or coherent breathing.
Why doesn't my score summary match the numbers I see?
Why doesn't my score summary match the numbers I see?
The labels in your Stability Score summary (under 'What shaped your score'), such as "Lower than your normal range," are based on your exact Resting heart rate and HRV values, not the rounded numbers shown on the graph.
Usually this makes no difference. But occasionally a label may look slightly off. For example, if your Overnight HRV shows as 50 and your normal range is 50–55, you might still see "Lower than your normal range." That's because your exact value (say, 49.6) was rounded up to 50 for display.
For the same reason, a label may sometimes seem stronger or milder than the displayed numbers suggest.
The app simply works with more detail than it shows. If you're ever unsure, look at your trends over time rather than a single reading.