Built an iPhone + Apple Watch app that tells you what your body is trying to say

I've been working on an app called Auralis over the past few months.

The idea started because I realized my Apple Watch collects a ton of health data, but I never actually understood what any of it meant. Heart rate, HRV, respiratory rate, sleep stages, resting HR... it all felt like disconnected numbers.

So I built an app that tries to answer the question:

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Some of the things it does:

• Turns sleep data into a Sleep Score with explanations.
• Calculates an Energy/Readiness Score using multiple HealthKit metrics.
• Explains HRV, resting heart rate, respiratory rate, and other health metrics in plain English.
• Syncs with Apple Watch and uses HealthKit data.
• Shows trends instead of just raw numbers.

The fun part wasn't the UI—it was figuring out how to combine all these different health signals into something that actually feels useful.

The project is built with:

• SwiftUI
• HealthKit
• WatchConnectivity
• Apple Watch integration
• Django backend for analytics and future AI features

This has probably been the biggest solo project I've built so far, and it's taught me way more than any tutorial ever could.

I'd genuinely love feedback from other builders:

• What would you add?
• What health insights do you wish your Apple Watch gave you?
• Any features you'd find genuinely useful?

Not trying to spam—I'm mostly interested in hearing what fellow builders think and what you'd improve.

Check the app link in bio.

Body Vitals:Health Widgets - Bloomberg Terminal For Your Body

I built Body Vitals - an iPhone health app where the widget IS the product and correlation is the killer feature.

What problem does it solve?

Cross-app health correlations that no single wearable can compute - Garmin + Oura + Strava + MyFitnessPal all feeding one readiness picture.

Here is the problem every health app ignores: Strava knows your run but not your sleep. Oura knows your HRV but not your caffeine. Garmin knows your VO2 Max but not your nutrition. Every app is a silo. Your body is not.
Body Vitals reads from Apple Health - the one place all your apps converge - and surfaces what none of them can individually.

Why use this instead of alternatives?

The correlation engine:

The Trends & Correlations screen runs 30-day Pearson-r scatter plots across your actual data:

Sleep hours vs HRV next morning
Mindfulness minutes vs resting HR
Caffeine intake (MyFitnessPal) vs overnight HRV
Training load vs recovery score
Daylight exposure vs sleep quality
One plain-English sentence per pair, computed on-device from YOUR numbers. Not a generic caption. Not a vibe. A real statistical relationship from your life.

And the AI Daily Coaching cross-references it all in plain language:

"HRV is 18% below baseline and you logged 240mg caffeine via MyFitnessPal. High caffeine suppresses HRV overnight."
"Your 7-day load is 3,400 kcal via Strava and HRV is trending below baseline. Ease off intensity today."
"VO2 Max of 46 and elevated HRV signal peak readiness. Today is ideal for threshold intervals."
No other app can say any of that because no other app reads from all those sources at the same time.

Everything else that makes it different:

Readiness Radar - five horizontal bars (HRV, Sleep, HR, SpO2, Training Load) showing exactly which dimension drags your score. Oura gives you one number. This shows WHERE the problem is.

Recovery Forecast - slide a sleep target AND planned training intensity to simulate tomorrow’s predicted readiness before you commit.

Five composite scores on the large home screen widget:
Longevity, Cardiovascular, Metabolic, Circadian, Mobility - each backed by named peer-reviewed research, each combining multiple HealthKit inputs into a 0-100 number.

Biological Age - computed from VO2 Max, mobility, HRV, sleep consistency.

Zone 2 Tracker - auto-detected from raw HR using San Millan & Brooks (2018). Ignores whatever zones Garmin or Strava assigned.

Acute:Chronic Workload Ratio - Gabbett (2016, BJSM) injury risk bands. Flags when A:C crosses 1.5. Flags undertraining below 0.8.

Allostatic Load - McEwen (1998). A stress-burden index no other consumer app computes.

Menstrual Cycle Phase Intelligence - suppresses false HRV anomaly alerts during luteal phase. That dip is expected. The app knows.

Daily Capacity and Focus Readiness - on-device blends of readiness, sleep debt, HRV, and circadian factors.

Anomaly Timeline - 7 anomaly types with coaching notes: HRV crashes, elevated HR, low SpO2, BP spikes, glucose spikes, low walking steadiness, low daylight.

Neural AI Health Coach - conversational, runs via Apple Foundation Models on your iPhone. Ask it anything. Nothing touches a server.

Widget stack (free + Pro) - small vitals gauges, medium sleep/activity/alert widgets, large Health Command Center and Weekly Pattern grid, Apple Watch complications (37 metrics, 2x2 grid, live HR), lock screen, StandBy.

Adaptive readiness weights - after 90 days, the algorithm recalibrates to YOUR signal variance. If sleep is your most volatile metric, it gets weighted higher. Population averages are the starting point, not the endpoint.

Available in 21 languages.

Cost:
Free - Many core features and widgets.
Weekly
Yearly
Lifetime

Appstore link:
https://apps.apple.com/us/app/body-vitals-health-widgets/id6760609127‬

Currently running:
Lifetime Deal @ 60% OFF - monthly offer.
https://apps.apple.com/redeem?ctx=offercodes&id=6760609127&code=OFF60

Visit - https://www.escapethematrix.app for more details.

Please let me know if this app helps you in any possible way to keep you informed with your health metrics.

So for context I posted FBA vs Whoop yesterday and readiness and sleep were pretty close. My Oura Ring didn’t track my sleep two nights ago I believe because of an update to iOS.

Last night all three tracked and I am currently traveling and drove 6 hours and stayed in a hotel on a pull out while my wife and kids have hotel beds.

FBA readiness 78
Whoop recovery 89
Oura readiness 80

Sleep time with FBA and Whoop about the same at 6.5 hours while Oura was at 6 hours and 8 min.

I don’t know if I feel like an 89 like with Whoop, but just waking up I can say I feel more like an 78-80 like FBA and Oura says.

Deep and REM sleep in FBA and Whoop with in 10 min of each other while Oura only accounted 45 min of deep sleep and over 2 hours of REM.

So today, driving another 3 hours, new hotel (2) this time, new bed ( no pullout) coach a baseball game and off to bed for another comparison tomorrow.

The luna band is launching today ( pre booking) and it looks promising so i would be prebooking it and try it out it is in the premium price budget 14k-15k but india based company so….

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I have a whoop just wondering what you think on which is better than the other

A few months ago I got fed up with my workout tracker.

Every app I tried wanted an account, a subscription, cloud sync, AI coaching, social features... I just wanted to log my lifts.

So I started building my own.

It was originally just for me, but it slowly turned into something much bigger than I expected. I ended up spending evenings and weekends adding all the things I wished other apps had.

Current features:

Completely offline (no account required)

Rest timers

Automatic warm-up sets

PR detection

Volume tracking and analytics

Bodyweight and cardio logging

500+ built-in exercises

Custom exercises

ExerciseDB cloud search for even more exercises

Export your data whenever you want

The biggest challenge wasn't actually building features, it was getting everything polished. One bug with Android back navigation took multiple attempts to fix because every change seemed to break something else. AI helped massively, but it also had a habit of confidently "fixing" one issue by introducing two new ones.

I've just pushed the first production release to the Play Store. It's a strange feeling seeing something you built sitting there for anyone to download.

I'd genuinely appreciate any feedback from people who lift regularly. I'm still actively improving it, so feature requests (or brutal honesty) are welcome.

https://play.google.com/store/apps/details?id=com.zerolog.app

I've been a personal trainer for years and I kept noticing was how many people don't track their workouts. Not because they don't care, but because at times it's a pain to do it. The intent was there, but the friction killed it.

People don't log their sets because grabbing your phone, unlocking it, and tapping through an app between every set is annoying enough that they just... don't. And that actually matters, because tracking is what drives progress. I've seen it firsthand for years. When I tracked my clients' workouts, they progressed because every session built on the last. I even had clients I'd track alongside them, and the second I wasn't there, the tracking stopped. And so did the progress. Same people, same programs, just missing that one habit.

So I wanted to eliminate the friction. I started building my own app from scratch, and the whole philosophy was to make logging completely get out of your way. It's a hands-free gym app where you just talk. Build a program, swap an exercise, log a set, ask a question - whatever you need, you just say it, like you would to a personal trainer standing next to you.

No grabbing your phone, no typing, no smudging your screen mid-set. Especially after a long day of staring at a screen, the last thing I want is to break my training flow just to poke at an app.

I also wanted to go beyond tracking, so I built in coaching in real time as well. You have a coach that talks back in your ear throughout the workout, guiding you set by set - basically the same 1:1 experience I'd give my clients when I'm standing right beside them, pushing them between sets. You just focus on the next lift, and it handles the rest.

I've been dogfooding it and testing it with beta users every week for about a year, tweaking it based on what actually helped people rather than what looked good in a demo. Between the hands-free tracking and the coaching, it's genuinely changed how I train, and now I wanted to share it with you all. It's live now and I'd genuinely love your feedback!

I'm just a trainer who decided to build the thing I always wished existed. It's iOS only for now, and if you'd like to try it, here's the link