r/lunaring

Luna is here, app is downloaded. Now to let it do its thing the next several days for finding a baseline.

Hey guys,

So here’s my honest take on the Luna Band. Just to be clear, I’m not with the team or anything, just a regular guy who managed to get his hands on one.

Attaching some photos comparing it side by side with the WHOOP so you can get a feel for the size. Wore it for a bit myself and yeah, it’s genuinely small and compact. Thickness-wise it’s pretty similar to the WHOOP, but honestly the Band feels lighter on the wrist — probably the strap material. I am not sure.

Software side, nothing to show you yet unfortunately. The app is expected after 10-12 August, so I’ll drop an update here once I actually have the app to play with.

Also planning to do a proper comparison with my Apple Watch — accuracy, specs, all of that — once I have both running side by side. Will post photos so you guys can judge for yourselves instead of just taking my word for it.

Build quality-wise though, no complaints — strap, metal holder, module all feel solid, not cheap at all.

Only real gripe so far is if you’ve got smaller wrists. Taking the Band off and on a lot can get a little annoying since the strap tends to slip out of the holder. If your wrist is medium or bigger, you probably won’t even notice this.

Drop your questions below if there’s anything specific you want me to check out, hardware or software side — I’ll keep this thread updated once the app’s finally live on the App Store.

Your wearable knows your resting heart rate to the beat, your temperature to a tenth of a degree and a lot more about you. But, it doesn't know whether you're vegan. That you take magnesium at night. That you injured your ACL in 2019. You get the gist.

All of this changes what your data means so this section covers everything Luna knows about you.

Five metrics, on a body:
Stress, SpO₂, resting heart rate, skin temperature and HRV that are annotated onto your image rather than stacked in a list, because your body isn't a spreadsheet. These show your latest reading as it is a current-state view: what your body is doing now.

Your bio data:
Age, biological sex, height, latest weight. Short section, but everything above and below it is interpreted through these.

Your Peak score:
The one number Luna leads with each morning, a 0–100 read on how ready your body is today, recalculated overnight. Next to it: how many days of data Luna holds, and how many of those were Peak days.

Your Health Profile (The part you write, in two halves)

Lifestyle:
How you move, how you eat, what you drink. The profile gets specific: search "tenn" and Tennis appears. Add it.

Diet:
Shows why the two are separate. Vegan is an identity, gluten-free is a hard rule, Mediterranean is a preference. Treat all three the same and you'll get recommended food you can't eat. So the profile splits them, and restrictions are lines Luna won't cross.

Medical:
Medications, supplements, allergies and sensitivities, surgeries, injuries, implants, mental health context. The things a sensor will never infer and that change the meaning of everything it records.

Your wearable baselines:
What your wearable has worked out on its own: resting heart rate, HRV, sleep duration and stages, latency, SpO₂, skin temperature, respiratory rate, VO2 max. Each calibrated to you over seven nights.

Why any of it matters:
The same number means opposite things depending on what Luna knows.

Skin temperature up half a degree is either illness or day 22 of your cycle. HRV down all week is either overtraining or an antidepressant still settling in.

Your wearable measures every one of those perfectly and cannot tell the difference between any of them. That's the profile's job!

Two people open a health app. One wants to know whether they're okay so they can get on with their day. The other wants to know exactly why.

The Health tab is built for both, on the same screen.

The top of the page is a read on your body right now; glanceable, five seconds, done. Underneath it, every single card opens. Nothing on this page is a dead end. You decide how far down you go, and you decide what's on the page in the first place.

On-demand Vitals:
Heart Rate, Stress, SpO₂ and Skin Temperature, in a grid at the top. Everything else in the app is passive, recorded while you got on with your life. This is the one place you can ask your body a direct question and get an answer in the moment: before a hard session, mid-afternoon slump, or on a day you just feel slightly off. Tap Measure now.

Sleep:
Duration up top, and whether that actually met your sleep goal, a target calculated for you, not a flat eight hours. Below it, the two numbers that tell you whether the night did its job: your HRV and your resting heart rate, each shown against your own baseline.

Heart Rate:
Three readings, because a single daily average tells you almost nothing: your lowest, your peak while you were asleep, and your most recent measurement.

Stress:
Your day is split into the time you spent Focused, Neutral and Stressed. You also see how recently we last read you, so you know whether you're looking at now or at three hours ago.

Activity:
Steps, active calories, distance. And honest about timing, open it at 8 AM and it won't pretend you've underperformed.

Health Monitor:
The part you own. A watchlist of biomarkers you build yourself, starting from five defaults you're free to strip out. Deep in a training block? Pull in Training Load. Tracking illness? Skin Temp and Respiratory Rate earn their place. Anywhere in the app you find a metric worth following, there's a button to add it straight here.

One more worth finding: tap the date at the top and you can switch on Sleep, Stress, Steps or Peak markers across the whole month. Fastest way to catch a pattern that only shows up across weeks.

Every single card opens and since I didn't want this to be a really long post, I'll cover each card separately!