The uncomfortable truth: Most wearable data is interesting but not actionable. The metrics that actually predict mortality — VO2 max, ApoB, fasting insulin, blood pressure, body composition — require lab tests, not wrist sensors. Wearables excel at three things: sleep tracking, activity motivation, and trend detection. Buy for those reasons, not for medical-grade data.
Wearables
Which wearable is right for you?
Filter by what you want to optimize. Every device has real strengths and honest limitations.
Oura Ring (Gen 3)
$299 + $6/mo
Smart Ring
The gold standard for sleep tracking. Small form factor makes it the most comfortable 24/7 wearable. Sleep staging accuracy approaches polysomnography in validation studies.
What it actually tracks
Best-in-class sleep data
No real-time workout metrics
Comfortable 24/7 wear
Subscription required ($6/mo)
Accurate HRV trending
No screen — phone dependent
Best for: People who prioritize sleep optimization above all else, or who want a second device for nighttime tracking.
Whoop 4.0
$239/yr (membership)
Fitness Band
Recovery and strain-focused. Designed for athletes and people who train hard. The strain/recovery paradigm is useful for preventing overtraining — a real longevity concern for serious exercisers.
What it actually tracks
Best strain/recovery algorithm
No display at all
Accurate HRV
Subscription-only model
Excellent for athletes
Sleep tracking inferior to Oura
Best for: Serious exercisers who want to optimize training load and recovery. Not ideal if fitness isn't your primary goal.
Apple Watch Ultra 2 / Series 10
$399–$799
Smartwatch
The best all-rounder. Does everything reasonably well, nothing perfectly. The ecosystem integration (Health app, Fitness+, fall detection) makes it the pragmatic default for most people. FDA-cleared ECG and blood oxygen.
What it actually tracks
Most complete feature set
Sleep tracking adequate, not best
FDA-cleared ECG
Daily charging required
VO2 max estimation
VO2 estimate less accurate than Garmin
No subscription
iPhone required
Best for: People who want one device that does everything. The default recommendation if you're only buying one wearable.
Garmin Forerunner 265 / Fenix 8
$450–$1,000
GPS Sport Watch
The most accurate wrist-based VO2 max estimation available, validated against metabolic cart testing. Garmin's Training Readiness, Training Status, and Body Battery algorithms are best-in-class for endurance athletes.
What it actually tracks
Best VO2 max estimation
Sleep tracking behind Oura
2-week battery life (Fenix)
Interface less polished than Apple
No subscription ever
Bulkier form factor
Best for: Endurance athletes and anyone who considers VO2 max their primary longevity metric. The most accurate wrist-based fitness tracking available.
Dexcom Stelo / Abbott Lingo
$89–$120/mo
Continuous Glucose Monitor
Now available OTC without prescription. Provides real-time glucose data showing how your body responds to specific foods, exercise, sleep, and stress. Most valuable as a 2-4 week diagnostic tool — not ongoing monitoring for non-diabetics.
What it actually tracks
Reveals personal food responses
Ongoing use rarely justified for non-diabetics
No prescription needed (OTC)
Measures glucose, not insulin (root cause)
Powerful behavior change tool
Expensive for continuous use
Best for: A 2-4 week diagnostic trial to identify your personal glucose responses to foods. Extremely eye-opening. Not worth ongoing cost for metabolically healthy non-diabetics.
Samsung Galaxy Watch 7 / Ultra
$300–$650
Smartwatch
The best Apple Watch alternative for Android users. BIA body composition sensor adds a unique data point (estimates body fat %, skeletal muscle, water). Sleep tracking has improved significantly. Samsung Health ecosystem is comprehensive.
What it actually tracks
BIA body composition (unique)
BIA accuracy is approximate
No subscription
Android only
Good all-rounder
Smaller app ecosystem than Apple
Best for: Android users who want the Apple Watch experience with the bonus of body composition tracking.
Xiaomi Smart Band 9 / Amazfit Band 7
$35–$50
Budget Fitness Band
Surprisingly capable for the price. Steps, heart rate, and basic sleep tracking at a fraction of premium device costs. The honest truth: for step counting and activity reminders, a $40 band captures 80% of the value of a $400 watch.
What it actually tracks
Incredible value
No HRV or advanced metrics
2+ week battery life
Sleep staging is rudimentary
Gets you moving
Sensor accuracy below premium devices
Best for: People starting their longevity journey who want activity tracking without spending $300+. Upgrade later when you know what you value.
Biological Age Testing
Which biological age test is worth it?
Biological age testing has exploded — but accuracy, actionability, and value vary enormously between providers. Here's the honest comparison.
| Test / Provider | Method | Cost | What It Measures | Accuracy | Actionability | Our Take |
|---|---|---|---|---|---|---|
| TruDiagnostic TruAge | DNA methylation (blood) | $229–$499 | DunedinPACE, GrimAge, Horvath, PhenoAge — multiple clocks | The most comprehensive option. Multiple clocks give different perspectives. DunedinPACE (pace of aging) is the most actionable metric. Best value for serious tracking. | ||
| Elysium Index | DNA methylation (blood) | $299 | Custom Elysium clock (based on Horvath lab research) | Solid science (Horvath collaboration) but only one clock. Less comprehensive than TruDiagnostic for the price. | ||
| GlycanAge | IgG glycosylation (blood) | $295–$495 | Biological age via glycan patterns on immunoglobulins | Measures a different dimension than DNA methylation (immune/inflammatory aging). Responds faster to lifestyle changes (3-6 months). Good complement to epigenetic testing. | ||
| NOVOS Age (via app) | Survey-based (no blood) | Free | Estimated biological age from lifestyle questionnaire | Free is the upside. But survey-based estimation is fundamentally less accurate than molecular measurement. Good starting point but not a substitute for blood-based testing. Our Bio Age Calculator offers similar utility for free. | ||
| Longevity Advice Calculator | Survey-based (no blood) | Free | Estimated biological age from health inputs | Free and web-based. Similar limitations to all survey-based tools — useful for motivation but not precision measurement. | ||
| IQ Healthspan Bio Age Calculator | Survey-based (no blood) | Free | Unvalidated lifestyle estimate, plus a PhenoAge calculator for nine routine blood tests | Free, no download, domain-specific breakdown shows WHERE you're aging fastest. Best free option for identifying actionable gaps. Pairs with our full tool suite. |
Our recommendation: Start with our free Bio Age Calculator to identify your weakest domains. If you want molecular-level data, TruDiagnostic's TruAge is the best value — request DunedinPACE specifically, as it measures your pace of aging (most actionable). Test twice, 6-12 months apart, to measure trajectory change rather than relying on a single data point.
Blood Testing Services
Testing services compared — and what you can do yourself
The longevity testing market is booming. Here's what each service offers, what it costs, and what you can replicate with IQH's free tools for a fraction of the price.
| Service | Cost | Includes | Physician Access | DIY Alternative |
|---|---|---|---|---|
| Function Health | $499/yr | 100+ biomarkers, 2x/year draws, dashboard | No (interpretation only) | Use our Blood Panel Builder + Quest/LabCorp self-order (~$300-400/yr for equivalent panel) |
| InsideTracker | $189–$589/test | 5-43 biomarkers, AI recommendations, InnerAge | No | Blood Panel Builder + Lab Interpreter provides similar analysis free. Self-order through Quest for the biomarkers. |
| Blueprint Biomarkers | $499/yr | 60+ biomarkers, biological age tracking, AI | No | Similar to Function Health. Our Bio Age Calculator + Blood Panel Builder covers most of the value. |
| Healthspan (getHealthspan) | $149+/consult | Telehealth consults, prescriptions (rapamycin, metformin, NAD+) | Yes — physician prescribing | No DIY alternative for prescriptions. Legitimate if you want longevity pharmaceuticals. Worth the cost for medical guidance. |
| Peter Attia's Early Medical | $150K+/yr | Comprehensive diagnostics, personalized protocols, 1:1 physician | Yes — concierge medicine | You can replicate 70-80% of the testing and protocol design with IQH tools for <1% of the cost. The 20-30% you can't replicate is the personalized physician relationship. |
| Quest/LabCorp Direct | $25–$500/panel | Individual tests, self-order in most states | No | This IS the DIY option. Use our Blood Panel Builder to select tests, then self-order. Lab Interpreter for analysis. Best value per dollar. |
The honest bottom line: For 80% of people, self-ordering through Quest/LabCorp using our Blood Panel Builder + Lab Interpreter provides 90% of the value of premium testing services at 20% of the cost. The remaining 10% — personalized physician interpretation and prescription access — is worth paying for if you have specific health conditions or want longevity pharmaceuticals (rapamycin, metformin).
Start Building Your Testing Plan
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