Comparison

Function Health vs Death Clock

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Function Health

Gain deep insights into your health with over 160 lab tests annually, personalized protocols, and AI-powered chat. Understand your body's evolution, track progress, and make informed changes with advanced science and your data.

Highlights
  • 160+ annual lab tests
  • Personalized health protocols
  • AI-powered private chat
  • Home or office blood draws
  • Advanced MRI & CT scans
  • Connect wearables
  • Upload health records
Features
Read full description

Function membership helps you take control of your health with 160+ lab tests each year, personalized Protocols, and Private AI Chat powered by Medical Intelligence—all backed by advanced science and your real data. Built with top doctors, Function gives you the power to understand your body, track how it evolves, and make meaningful change. NOW AVAILABLE: HOME OR OFFICE BLOOD DRAWS Schedule a concierge blood draw at your home or office. A licensed specialist comes to you and completes your blood draw in under 20 minutes. Available in select locations. 160+ LAB TESTS Membership includes testing for your heart, hormones, thyroid, liver, kidneys, toxins, nutrients, inflammation, autoimmunity, immunity and more. ADVANCED MRI & CT SCANS Detect early signs of cancer and hundreds of other potential conditions with the option to purchase advanced imaging for your brain, pancreas, liver, spine, ovaries, prostate, heart and much more. MEDICAL INTELLIGENCE Built with leading medical scientists, Function’s proprietary model brings together your health history and insights from a large population to help you better understand your health and find steps you can take today to support your health over time. PRIVATE AI CHAT Ask questions about your results, identify meaningful patterns, and figure out where to focus next, with Private AI Chat—powered by Medical Intelligence and built in partnership with top clinicians. CONNECT WEARABLES Connect Apple Health and other health devices and wearables to see how your activity, sleep, and daily habits affect your lab test results and long-term health. PROTOCOLS Translate your lab results, scans and health history into clear, evidence-based plans for nutrition, activity, and supplements—all customizable to your goals and preferences. UPLOAD HEALTH RECORDS Upload past lab test results, scans, and other medical records for a more complete view of your health, all in one secure place. PROGRESS YOU CAN SEE Twice-yearly and On-Demand testing helps you track your results over time, monitor for early signs of disease, and identify where to focus next. ADVANCED LAB TESTS Membership includes 160+ lab tests, plus the option to purchase advanced On-Demand tests for: - Detection of 50+ cancers - Alzheimer’s risk detection - MTHFR gene variants - Advanced MRI and CT scans starting at $365 - Food allergies and sensitivities - …and much more ACCESSIBILITY What could cost as much as $15,000 on your own is included with membership for just $365/year. Lab testing is available at over 2,000 lab locations across the US, with no insurance needed. SECURITY Function was built for privacy and security. Function is built to HIPAA standards. Your information is secure. How it works: 1. Join Function and schedule your first set of lab tests. 2. Get your results and personalized Protocols. Ask questions with your Private AI Chat. 3. See your progress with 60+ lab tests at your Mid-Year Test. 4. Purchase MRI or CT scans and other advanced On-Demand Tests any time. DISCLAIMER Function Health is a technology company and not a laboratory or medical provider. All laboratory and medical services are provided by independent third parties. Function Health does not offer medical advice, laboratory services, a diagnosis, medical treatment, or any form of a medical opinion; its services are not a substitute for medical care, medical advice, and/or a detailed discussion with a physician or other licensed provider. If you have any questions regarding any laboratory results or any other information that you access through Function Health, you should contact a physician or other licensed provider. All material, information, data, and content that Function Health provides is strictly for general information purposes. For additional important information: https:// www.functionhealth.com/terms-of-service.

About

Death Clock

This AI-powered health app analyzes your data to predict your lifespan and provide a personalized plan for a longer, healthier life. It offers guidance on diet, exercise, and screenings, with an AI health concierge to interpret results and track progress.

Highlights
  • AI-driven lifespan prediction
  • Personalized health and longevity plans
  • AI health concierge
  • Bloodwork analysis and interpretation
  • Habit and progress tracking
  • Integration with Apple Health and wearables
Features
Read full description

Powered by advanced AI and grounded in medical science, Death Clock reveals not just when you might die—but how to live better, longer. The Life Lab turns your health data into a personalized plan for longevity. Your AI health concierge guides you through every step: analyzing bloodwork, optimizing habits, and tracking progress as your projected lifespan evolves in real time. Step 1: Discover Your Baseline Understand your current life expectancy through our AI-driven longevity model, built from CDC data, global mortality research, and your lifestyle inputs like daily habits and workouts. Each subscription includes comprehensive blood testing, giving you deeper insight into key biomarkers like blood pressure, blood sugar, hormone levels, fasting blood glucose, and heart health that drive your overall health and lifespan. Step 2: Build Your Health Plan Get clear, evidence-backed recommendations for diet, exercise, supplements, and screenings—no noise, no gimmicks. Our clinical board of leading physicians and longevity researchers provides doctor-guided advice on every framework and feature we build, ensuring Death Clock reflects the latest science in preventive healthcare, and life-extension research. Use our AI health coach to form better habits and track your progress with a personalized health tracker. Step 3: Add Years to Your Life After answering questions related to your health and habits, Death Clock gives you a death date prediction, but every healthy change feeds back into your Life Clock, stretching time a little further each day. Track improvements in cholesterol, inflammation, kidney function, glucose, blood pressure, heart rate, and other biomarkers to see your projected lifespan increase in real-time. The Concierge Difference Trained on your unique health profile, your 24/7 AI health concierge interprets lab results, identifies next steps, and speaks the language of preventive medicine and healthcare. It’s like having a private longevity doctor or health tracker—without the $10,000 retainer. Sync your Apple Health data, or activity metrics from wearables like WHOOP and Oura Ring. Monitor vital signs like blood pressure, heart rate, blood sugar, and heart conditions with ease. The AI health concierge can also give you recommendations on supplements and medicine, and on how to get better sleep and relieve stress. Privacy by Design Your data is fully encrypted and never sold. Longevity should feel empowering, not invasive, as you use the Death Clock AI app’s features and bloodwork scheduling for better health. Your Time Starts Now Predict your death date and start the countdown. Schedule your blood draw. Create your longevity plan. Take your time back and extend your life with Death Clock, your AI health coach and tracker. Download includes a free trial of all premium features. A subscription is required for full access to your personalized longevity data and tracking tools. Terms of Use: https://deathclock.co/terms-of-use Privacy Policy: https://deathclock.co/privacy-policy

Screenshots

Function Health4 screens
Death Clock4 screens

Verdict

The call

Function Health and Death Clock both sit at 4.9 stars, but that hides the real split: 62% of Function Health's written reviews are positive against 24% of Death Clock's. Function Health also leads on in-app purchases (none vs 10). On price, rating, ratings volume and update cadence there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Death Clock sells 10 in-app purchases, starting at $9.99 per month. Function Health asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.9 for Function Health against 4.8 for Death Clock. Both are backed by a comparable volume of ratings — 25K and 18K respectively. Written reviews are what separate them: 62% of Function Health's written reviews are positive against 24% of Death Clock's.

UpkeepUpdate frequency

Function Health ships an update weekly, Death Clock every 5 days. Both last shipped on November 9, 2026.

Scorecard3 real differences · 7 level
Function Health versus Death Clock: the parameters behind the verdict, then further details
ParameterFunction HealthDeath Clock
PriceFreeFree
Rating4.9 (25K ratings) — better4.8 (18K ratings)
Positive reviews61.5% of reviews — better23.5% of reviews
Number of ratings25K — better18K
Update frequencyWeeklyEvery 5 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhoneiPhone, iPod — better
Requires iOS16.415.1 — better
Further details — not scored
Size206 MB138 MB
Age rating17+12+
DeveloperFunction HealthMost Days

Customer experience

Function Health

All ratings25,127 ratings
Positive99.0%
Neutral0.4%
Negative0.6%
Written reviews351 reviews
Positive61.5%
Neutral5.7%
Negative32.8%

Death Clock

All ratings18,002 ratings
Positive96.3%
Neutral1.1%
Negative2.6%
Written reviews425 reviews
Positive23.5%
Neutral5.6%
Negative70.8%

User reviews

Function Health

From 25K App Store ratings

What we love

  • 🚀 Seamless process for blood tests and results
  • 📊 Comprehensive health insights and tracking
  • 🧠 Helpful clinician notes and recommendations
  • 👍 User-friendly and visually appealing app
  • 💰 Affordable compared to other options

Room to improve

  • 🔍 Lack of communication and support responsiveness
  • 🐛 Some bugs and usability issues in the app

Death Clock

From 18K App Store ratings

What we love

  • 💡 Interesting and amusing experience
  • 👍 Clean, smooth interface
  • 👍 Provides immediate results
  • 👍 Free to use without account

Room to improve

  • 🐛 Buggy, with issues like freezing and crashing
  • 💰 Misleading about subscription fees and trial periods
  • 🤔 Inaccurate or irrelevant recommendations
  • 🤔 Doesn't account for important health factors

Bugs and requests

Function Health

Reported bugs

2 issues
  • App sometimes redirects back to the home screen when trying to view results
  • Occasional typos and formatting issues in the app

Requested features

3 requests
  • More customization options in the app settings
  • Ability to print or export test results and recommendations
  • Specific supplement recommendations rather than broad suggestions

Death Clock

Reported bugs

3 issues
  • Unable to create an account or progress past the first name screen
  • Subscription charges despite canceling trial period
  • Incompatible with certain devices or OS versions

Requested features

4 requests
  • Allow users to update their profile and recalculate lifespan
  • Provide more detailed and personalized health recommendations
  • Improve transparency around data usage and privacy
  • Add gamification elements to encourage healthy lifestyle changes

In-app purchases

None

Function Health

No in-app purchases

10 purchases

Death Clock

Subscriptions10
  • Death Clock AI Membership$9.991 Month
  • Death Clock Membership3 Days trial$39.991 Year
  • Death Clock AI Membership7 Days trial$39.991 Year
Show 7 more
  • $49/yr Digital Only3 Days trial$49.991 Year
  • Death Clock Membership3 Days trial$59.991 Year
  • Death Clock Digital Membership3 Days trial$69.991 Year
  • Death Clock AI Membership3 Days trial$69.991 Year
  • Death Clock Membership3 Days trial$79.991 Year
  • $99 Baseline, 3-Day Trial3 Days trial$99.991 Year
  • Death Clock Membership3 Days trial$99.991 Year

Questions

Is Function Health free?
Function Health is free to download, with no in-app purchases.
Is Death Clock free?
Death Clock is free to download, with in-app purchases available.
Which has better reviews, Function Health or Death Clock?
Function Health is rated higher. Function Health averages 4.9 out of 5 from 25K ratings, while Death Clock averages 4.8 from 18K ratings.
Do Function Health or Death Clock have ads?
Neither Function Health nor Death Clock shows ads.
Which is updated more often, Function Health or Death Clock?
Function Health ships an update weekly, and Death Clock every 5 days. Most recently, Function Health was updated on November 9, 2026 and Death Clock on November 9, 2026.

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