What it is built for
- Sam
- A record over months
- Garmin
- Readiness for today
Comparison
Garmin vs Apple Watch: same signals, different job
Garmin builds excellent hardware, and Body Battery and its stress score tell you how much you have in the tank today. Sam does something else: it records one condition month after month and puts it into a document for your doctor. Sam is an iPhone app that reads Apple Health, so it can show what your Garmin app saves there. You can use both together.
Sam
Garmin
Which one fits you?
Pick Garmin if ...
- you want training readiness, Body Battery and a stress score
- you want battery life of days or weeks
- sport is why you wear a watch: multi-sport tracking, maps, running and cycling
Pick Sam if ...
- you want a record of a condition over months for your doctor
- you want a doctor report as a PDF for 1, 3, 6 or 12 months
- you wear an Apple Watch, with ECG on the wrist and Apple Health
Garmin and Sam side by side
This is not a question of which sensor is better. Both read heart rate and heart rate variability at the wrist, both have limits, and neither replaces a clinical measurement. The difference is what happens to the numbers afterwards.
| Sam | Garmin | |
|---|---|---|
| What it is built for | A record over months | Readiness for today |
| A diary per condition | Eight conditions | Not its focus |
| Doctor report as PDF | Per program, 1 to 12 months | Not its focus |
| Data into Sam | Via Apple Health | If its app saves to Apple Health |
A diary per condition
- Sam
- Eight conditions
- Garmin
- Not its focus
Doctor report as PDF
- Sam
- Per program, 1 to 12 months
- Garmin
- Not its focus
Data into Sam
- Sam
- Via Apple Health
- Garmin
- If its app saves to Apple Health
Only points we can state plainly are listed. Check Garmin's own pages for details.
Using both: training and the condition record
- Train with your GarminKeep wearing it for sport, maps and multi-day battery.
- Let Sam read Apple HealthIf your Garmin app saves its data to Apple Health, Sam reads it there. Log a symptom day, a sick day or a medication dose in Sam, about thirty seconds a day.
- Take the PDF to your appointmentYour signals, your logged days and your questionnaire scores over time. Sam only reads what Apple Health holds, so the two keep separate data.
Sam is a wellness companion, not a medical device. It does not diagnose, it records what you and your wearable document. Every medical judgement belongs to your doctor. Garmin's stress score and Body Battery are likewise wellness figures, not clinical measurements.
Questions people ask before switching
Is Garmin or Apple Watch more accurate for HRV?+
We are not going to give you a winner, because the honest answer depends on the model, the fit and the night. Both measure at the wrist with an optical sensor and differ from a chest strap or an ECG under some conditions. The bigger practical difference is sampling: Garmin records HRV continuously through the night, Apple Watch samples it in the background. Neither is a clinical measurement.
Does Sam work with a Garmin watch?+
Yes, if your Garmin app saves its data to Apple Health. Sam reads Apple Health, so a Garmin, an Apple Watch, Oura or Whoop can all be the source. A value appears only if your device records it and its app writes it there.
Is Body Battery the same thing as Sam's record?+
No, and they do not compete. Body Battery answers how much energy you have today. Sam keeps what your last six months looked like. For a single number each morning, Garmin is the better tool. For an appointment, Sam is, with its doctor report.
Which one has better battery life?+
Garmin, by a wide margin: many models run for days or weeks, an Apple Watch roughly a day. Sam can only show nightly values that your device recorded and saved to Apple Health, so wear whichever watch you prefer overnight.
Can I use both?+
Yes, plenty of people do. Wear the Garmin for training and let Sam read what it saves to Apple Health, or add an Apple Watch for the rest of the time. The two systems keep separate data.
What do I need to start with Sam?+
An iPhone. An Apple Watch (Series 4 or newer recommended) or another wearable that saves to Apple Health adds values, but you do not need one. The free tier includes one medical program and two lifestyle programs. Pick the condition you live with and Sam follows the Apple Health values that fit it.
Bring your months to the appointment
If you want a training and readiness watch, Garmin is a strong choice and we will not pretend otherwise. If you want a record of your condition that a doctor can read, that is what Sam does, on your iPhone with what your watch saves to Apple Health.