Your context
Move from generic advice to your available history.
Cortex can retrieve Metric data connected to the question, so an answer can refer to your recorded trend rather than an imaginary average person.
Cortex AI
Ask focused questions about your own health trends.
Cortex is Metric’s AI health coach for plain-language questions about supported data in your Metric history. Ask about sleep totals, VO₂ max, heart rate, workouts, nutrition, or biological-age contributors, and Cortex can retrieve relevant context before answering. Its responses are informational and should be checked against the underlying data.
- Questions in plain language
- Context from Metric tools
- Underlying metrics stay inspectable
The useful answer
A better question can make a crowded health history useful.
Cortex can call Metric tools to retrieve supported data for a question instead of relying only on a generic chat. A prompt about VO₂ max can bring in the relevant series; a workout comparison can retrieve recorded sessions for the requested period.
The strongest prompts are narrow, dated, and verifiable: ask what changed over a month, which data supports the answer, or what information is missing.
Inside Metric
Designed to keep the context attached.
Every summary should lead back to the signal, date range, or source that shaped it.
Follow the evidence
Keep the chart within reach.
Use the response to identify which metric and time window to inspect next. The answer is a starting point for review, not a replacement for the source.
Useful prompts
Ask one decision-sized question.
“How did my resting heart rate change this month?” is easier to ground than “How healthy am I?” and gives you a result you can verify.
How it works
Three steps from data to a better question.
Choose a narrow question
Name the signal, date range, or decision you want help understanding.
Let Cortex gather context
The assistant uses available Metric tools and history relevant to the request.
Verify the answer
Open the cited metric, notice missing data, and use appropriate professional help for consequential decisions.
What to know first
Useful, with clear limits.
- Generated answers can be incomplete or wrong, even when the underlying data is accurate.
- Cortex only has the context available through the data, permissions, and tools used for that conversation.
- Cortex is not for urgent symptoms, diagnosis, medication decisions, or replacing a qualified professional.
A good fit if
- You have a specific question about a trend already recorded in Metric.
- You want a faster path from a question to the relevant chart.
- You are comfortable reviewing the answer rather than accepting it automatically.
Probably not for you if
- You need urgent, diagnostic, or prescriptive medical guidance.
- You expect the assistant to know facts that are absent from your data.
- You do not want to use an AI-assisted feature.
Common questions
The short version.
What can I ask Cortex?
You can ask focused questions about supported Metric data such as sleep totals, VO₂ max, heart rate, workouts, nutrition, steps, and biological-age contributors.
Does Cortex see all of Apple Health?
No. Its context is limited to the categories you authorize and the Metric tools used for the conversation.
How do I get a better answer?
Name a signal and time window, ask Cortex to state what data it used, and check the resulting claim against the underlying Metric chart.
Sources and context
Read the primary material.
Official platform documentation and original research are linked for context, not used to overstate what one app view can conclude.
Apple Developer
HealthKit framework overview
Apple explains HealthKit as a user-controlled repository for health and fitness data from iPhone, Apple Watch, apps, and compatible devices.
Apple Developer
Authorizing access to health data
Official documentation for HealthKit’s category-by-category read and write permissions, including limited-history access.
Apple Support
Manage Health data on iPhone, iPad, or Apple Watch
Apple’s guide to data sources, app access, source priority, manual entries, and permission controls in the Health app.
Metric for iPhone
Make your health history easier to use.
Connect only the categories you choose. Start with the dashboard, then go deeper when a trend earns your attention.
Download on theApp Store