# Early Signal and Apple’s Vitals app

Canonical: https://getearlysignal.app/en/alternatives/apple-vitals-app

> Both read overnight Watch metrics against your own range. They are different products with different jobs.

## In short

Apple’s Vitals app shows overnight heart rate, respiratory rate, wrist temperature (Series 8 and Ultra), blood oxygen where available, and sleep duration against a typical range learned from your sleep. Early Signal is a separate iPhone wellness app that reads Apple Health on device, adds HRV as support, and shows Typical, Slightly off, or Off from usual. Neither product is a medical device, and this page does not rank them.

Last reviewed 2026-09-24

## What Vitals is for

Vitals ships with Apple Watch. After you wear it to sleep—Apple says about seven nights to establish a typical range—it classifies overnight metrics as typical or outside that range. A notification can fire when multiple metrics are out of range, with context about factors that may be involved. Wrist temperature needs Series 8 or later, or any Ultra.

## What Early Signal adds on top of Health

Early Signal does not replace the Watch. It reads samples already in Apple Health and scores them on your iPhone. Wrist temperature and breathing lead when present. HRV and resting heart rate support. Sleep is context. The status ladder is Typical, Slightly off, or Off from usual, and Off from usual pushes are capped. Apple’s published Vitals metric list does not include HRV; Early Signal uses HRV from Health as its own supporting signal.

## Where the data stays

Vitals is Apple’s app on the Watch. Early Signal’s scoring stays on the iPhone. Neither comparison here is a claim about clinical accuracy. If you feel unwell, seek care regardless of either screen.

## Comparison

| | Early Signal | Apple Vitals |
| --- | --- | --- |
| Hardware | iPhone app that reads the Apple Watch you already wear. | Built into Apple Watch. |
| Signals | Wrist temperature and breathing lead when present. HRV and resting heart rate support. Sleep is context. | Overnight heart rate, respiratory rate, wrist temperature (Series 8 and Ultra), blood oxygen where available, and sleep duration. HRV is not in Apple’s published Vitals list. |
| Where it runs | Scoring stays on the iPhone, using samples already in Apple Health. | Apple’s app on the Watch, after about seven nights to learn a typical range. |
| Status | Typical, Slightly off, or Off from usual. Off from usual pushes are capped. | Overnight metrics are typical or outside your range. A notification can fire when multiple metrics are out of range. |
| Limits | Wellness tool. Does not diagnose or treat disease, and is not medical advice. | Not a medical device. This page does not rank the products. |

## Guide FAQ

### Is Early Signal a replacement for Vitals?

No. Vitals is built in. Early Signal is an optional wellness status from the same nights, with a different signal mix and a rare-alert design. You can use either, both, or neither.

### Does this page rate Apple?

No. It describes the job each product documents. There are no scores, prices, or download claims.

## Sources

Public documentation cited as context—not as clinical validation of Early Signal.

- [Apple — Track your overnight vitals with Apple Watch](https://support.apple.com/en-us/120142)
- [Apple — Track your nighttime respiratory rate](https://support.apple.com/en-us/HT211027)

## Privacy · Terms · Science

GetEarlySignal is a wellness tracking and rest-day support tool. It does not provide medical diagnoses, treatment plans, clinical assessments, or healthcare advice. The app does not replace professional medical care or emergency healthcare services.

- [Privacy](https://getearlysignal.app/en/privacy)
- [Terms](https://getearlysignal.app/en/terms)
- [Science](https://getearlysignal.app/en/science)