On-device · Apple HealthKit

Know when to push.
Know when to rest.
See how you're aging.

Longevity Arc turns your Apple Watch and iPhone data into a clear daily score — so you know whether to train hard, recover, or pay attention to where your health is heading long-term.

App Store Explore features Read the blog
Reads Apple Health — Watch, iPhone, and compatible accessories
Signal math runs on your device — no account required
HRV dashboard included free
Pro adds depth, trends, and coaching tips (Apple Intelligence where available)
Optional monthly plan with trial, or lifetime unlock
Daily Snapshot

Know at a glance. Act with confidence.

Each morning, Longevity Arc turns the data your Apple Watch and iPhone already collected overnight into a single dashboard — so you know whether to push hard today, take it easy, or pay attention to a longer-term trend.

Arc dashboard & composite score
A single gauge summarises how your five signals align today. Tap any metric to see status, trends, and how each formula uses your HealthKit inputs.
HRV resilience (free)
Nighttime heart rate variability interpreted against your recent baseline — always available without a subscription.
VO₂max fitness (Pro)
Uses measured VO₂max from Apple Health when present, with clear charts and coaching context when you unlock Pro.
Sleep recovery (Pro)
Duration and efficiency blended into a sleep recovery signal with historical charts for subscribers.
Gait speed (Pro)
Walking speed from HealthKit as a mobility longevity marker — unlocked with Pro alongside explanations and trends.
Resting HR trajectory (Pro)
Compares your rolling resting heart rate against the prior baseline to surface cardiac stress patterns early.
Insights & coaching tips (Pro)
Lens-based summaries across your signals, generated with Apple Intelligence on-device where supported — tailored to the numbers in your arc.
Privacy by architecture
HealthKit access is read-only on your iPhone. We do not operate cloud databases for your vitals; processing stays local except for standard App Store billing through Apple.
How it works

Grant access once. We handle the math.

Apple Health stays the source of truth — Longevity Arc never asks you to wear anything new.

1
Install & connect Health
Approve read access for heart rate, HRV, sleep, activity, and body metrics. Everything stays on-device.
2
Review your arc
Your arc and composite score appear instantly — see today's recovery status and long-term trajectory at a glance.
3
Go deeper with Pro
Subscribe monthly (includes a free trial where offered) or unlock lifetime access for formulas, charts, and coaching tips.
Science-grounded

Five signals. One arc.
All from Apple Health.

Each signal is grounded in published longevity research and tuned for everyday wearables — computed on-device so your health history never leaves your phone.

  • 1HRV resilience — how well your autonomic nervous system recovered overnight, compared to your personal baseline (free).
  • 2VO₂max fitness — your cardiorespiratory capacity, straight from HealthKit measurements.
  • 3Sleep recovery — duration and efficiency merged into a single signal that reflects how restorative last night was.
  • 4Gait speed — your walking pace as a mobility and vitality marker tied to long-term health outcomes.
  • 5RHR trajectory — resting heart rate trend versus your prior baseline, surfacing cardiac stress patterns early.
48 HRV ms
42 VO₂
7.4 Sleep h
82
LONGEVITY SCORE
HRV
Autonomic
48 ms
Stable
VO₂
Fitness
42
Strong
ZZZ
Sleep
7.4 h
On track
Walk
Gait
1.32 m/s
Solid
RHR
Cardiac
−3%
Favourable
Pricing

Free HRV.
Upgrade when you want the full arc.

Monthly plans renew automatically until cancelled; lifetime is a single purchase. Exact pricing is shown in App Store checkout for your region.

Free
$0
No account required
  • Longevity composite score
  • HRV resilience signal & trends
  • Trends charts for HRV
Download free
Flexible
Pro Monthly
$2.99/mo
Free trial where available · cancel in App Store settings
  • Everything in Free
  • VO₂max, sleep, gait & RHR trajectory signals
  • Detail charts & formula sheets
  • Insights & coaching tips (Apple Intelligence)
Start on App Store
Early adopters
Pro Lifetime
$9.99
One-time · early adopter pricing · all future Pro signals included
  • Same Pro features as monthly
  • No renewal — pay once on your Apple ID
  • Restore anytime via Settings → Restore Purchase
Unlock lifetime
FAQ

Common questions

Everything you need to know before downloading.

Does Longevity Arc upload my health data?
Your Apple Health metrics are read on-device to calculate signals and charts. The developer does not operate a backend that stores your HealthKit history. Coaching copy is generated with Apple Intelligence on-device where supported — not by sending vitals to our servers.
Which metrics feed the five signals?
Typical inputs include nighttime HRV, VO₂max (when recorded), sleep duration and efficiency, walking speed from Apple Health, and resting heart rate trends — whatever your Watch or phone already captures.
What do I get for free vs Pro?
Free includes the composite longevity score and full HRV resilience readouts with trends. Pro adds VO₂max, sleep recovery, gait speed, resting HR trajectory, expanded charts, formula transparency, and AI coaching tips.
How does billing work?
Purchases run through Apple. Choose a monthly plan (with a free trial when Apple offers one in your region) or a one-time lifetime unlock. Manage or cancel subscriptions under your Apple ID settings.
Can I restore Pro after reinstalling?
Yes. Open Settings → Restore Purchase inside Longevity Arc while signed into the same Apple ID used for the original transaction.
Do I need an API key?
No. Unlike BYOK health apps, Longevity Arc never asks for Claude, OpenAI, or Gemini keys — coaching tips rely on Apple's on-device models instead.
Is this medical advice?
No. Longevity Arc is for wellness insight only. Always speak with a licensed clinician about diagnosis, treatment, or acute symptoms.
Guides

Learn how to read your health data.

Practical explainers on Apple Health metrics — written for anyone turning wearable noise into actionable longevity signals.

HRV

HRV Explained: What Your Heart Rate Variability Is Actually Telling You

What HRV measures, why personal baselines matter, and how to interpret nightly variability trends responsibly.

Read article →
Recovery

Recovery Score: Training readiness from wearable data

How to combine sleep quality, HRV, and cardiac markers before deciding whether to push training intensity.

Read article →

Chart your arc today.

Free to download. HRV insights unlocked instantly — upgrade whenever you want the full signal breakdown.

Download on App Store