Frequently Asked Questions

Everything you need to know about Dayline AI. Can't find what you're looking for? Get in touch.

• insights How does Dayline AI work?
  Dayline AI analyzes up to 120 days of your Apple Health data to detect meaningful patterns across sleep, activity, heart rate, recovery, and more. It filters out the noise and delivers one clear, human-readable sentence that captures what matters most today.
• lock Is my health data private?
  Yes. Your privacy comes first.
  
  Dayline AI reads only the data you allow through Apple Health. To generate your Dayline, selected data is securely processed by a leading AI model.
  
  Your data is: never sold; never used for ads; never shared beyond generating your insights. You can revoke access at any time through Apple Health settings.
  
  Full details in our Privacy Policy.
• devices Do I need additional devices or apps?
  No. Dayline AI works with Apple Health. For deeper insights, we recommend wearing an Apple Watch — but if your data is in Apple Health, Dayline can use it.
• widgets How do I add my Readiness score and Bio Age to a mobile widget?
  After generating your Dayline, you can add the Readiness score and Bio Age directly to your iPhone's home screen widget settings for quick daily access.
• bar_chart Why is one sentence better than charts?
  Charts show data. Dayline shows meaning.
  Instead of interpreting graphs, you get a clear Dayline based on long-term patterns — instantly understandable and actionable.
• lightbulb What kind of insights will I get?
  Dayline AI reveals patterns in your health that are easy to miss on your own. You'll see how sleep quality affects recovery, how the timing of your activity shapes energy levels, and how daily movement and rest interact.
  
  Examples: three nights of restless sleep affecting your recovery trend; consistent afternoon activity boosting heart rate recovery; heart rate variability shifts after active days. Every Dayline reflects your personal data and hidden connections — not generic tips — so you can make smarter, actionable decisions.
• calendar_month How far back does Dayline analyze?
  Dayline AI can analyze up to 120 days (Pro) of historical health data to detect trends and connections you wouldn't see in daily charts.
• chat_bubble Can I ask follow-up questions?
  Yes. With Discover AI Chat, you can ask about changes, trends, or specific metrics to better understand what's influencing your Dayline and health data in general.
• medical_information Is Dayline medical advice?
  No. Dayline AI provides informational insights based on your health data. It does not replace professional medical advice.
• schedule How often is my Dayline updated?
  Your Dayline updates daily as new data syncs from Apple Health.
• trending_up What is the Readiness score and why does it matter?
  Readiness (Pro) is a daily score: one number for today that shows how ready your body is for strain, stress and training. It helps you decide whether to go hard today or prioritise recovery — so you train smarter, not guess.
• compare_arrows What's the difference between Readiness and Adaptation?
  Readiness updates daily and answers “what about today?” — whether to push or ease off.
  
  Adaptation is a weekly smoothed score with a month-level view. It answers “is my body adjusting to this new routine or training block?” over time — not from a single day's spike or dip.
• person What is Bio Age and how is it used?
  Bio Age (Pro) estimates your biological age and pace of ageing from your health data, compared to your actual birth date. It gives you a clear view of whether your body is ageing faster or slower than the calendar — so you can see the impact of how you live and recover.