Why your partner will never see your heart rate

The most common feature request we get is a version of the same thing: let me see my partner's numbers. Their sleep, their resting heart rate, a little dashboard of how they are doing.

We are not going to build it, and the reason is not squeamishness about data. It is that we think the feature makes couples worse, and we have a fairly specific account of why.

A number without context invites the wrong response

Imagine your partner's HRV appears on your phone one morning: 31, down from a usual 48.

You now know something and can do almost nothing useful with it. You do not know whether it was the wine, the flight, the argument with their sister, the beginning of a cold, or the room being too warm. You have a precise-looking figure and no interpretation.

What people do with that is predictable. They worry. Or they check, repeatedly, which turns into a habit of monitoring. Or they lead with it: "your HRV is low, are you okay?" — a sentence that manages to be both intrusive and unhelpful, because it asks the other person to explain their own physiology on a day they have nothing spare.

The number feels like information. In a relationship it mostly functions as an alarm with no instructions.

It changes what the measurement does to you

There is a second effect, on the person being measured.

Wearables already encourage a mild self-surveillance: the morning check, the small disappointment, the sense of having failed at sleeping. Now add an audience. If you know your partner sees the score, a bad night becomes something to explain, or to pre-empt, or to defend. People start performing for the metric, or quietly turning the sharing off, which is a loss for both of you.

The pattern is familiar from shared step counts and shared location. The moment a measurement is visible to someone who cares about you, it stops being observation and becomes a report card.

What actually helps is much smaller

Here is what your partner genuinely needs on a hard day: a rough sense of which kind of day it is, early enough to change how they open the conversation.

That is it. Not a chart. Not a trend line. A hint, in language a person can act on.

So Pulse gives them one sentence: a calm evening might mean a lot today. Alongside it, two or three things they can do — hold, together; send a candle; ask what helps.

The sentence carries the useful part of a low reading and none of the false precision. It says "maybe", because "maybe" is the truth: the app noticed that today looks different from your own recent weeks, and it has no idea why. Only you know that.

How the line is drawn in the app

The rule we hold ourselves to is simple to state and a bit harder to build:

• Your raw signals — resting heart rate, HRV, sleep, movement — are read and interpreted on your own device. They are not sent to our servers and they are never shown to your partner.
• You can see the signals behind your own reading, and how confident it is. It is your body; you should be able to check the app's work.
• The only thing that crosses over is the one-sentence cue, and it expires at midnight. There is no history of your bad weeks for anyone to scroll back through.
• Anything unusual is shown to you first. If a short window of unusual heart signals turns up, nothing reaches your partner unless you approve that specific moment, and you can soften the wording or keep it private.
• Cycle phase, if you switch on Rhythm Awareness, shapes the tone of a cue without ever naming the phase. Sharing your actual calendar is a separate choice, off by default.

None of that is technically hard. It is a set of refusals, and refusals are the part of a product that has to be decided early, because they are almost impossible to add back later.

"But we have no secrets from each other"

This comes up, and it deserves a straight answer rather than a slogan.

Sharing your health data with your partner is a legitimate thing to want, and if that is what you are after, a health app with shared access will serve you better than we will. We are not claiming that couples who share numbers are doing something wrong.

What we are claiming is narrower: the numbers are not what produce closeness, and an app built around them ends up measuring a relationship instead of supporting one. Two people can know everything about each other's sleep quality and still have no idea how to be useful to each other on a Tuesday evening.

The app we wanted to build answers the Tuesday evening question.

The one-line version

Your partner does not need your data. They need a decent guess about how to show up — and that fits in a sentence.

If you would rather see how we handle the underlying measurements, what HRV actually tells you covers the science, and the privacy section covers the rest.