Comparison

Function Health vs Don't Die

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

Don't Die

This app fosters a supportive community focused on health and longevity. Users can share progress, discover local groups, and track their health habits to improve their 'Don't Die Score'. It encourages friendly competition and integrates with wearables for automatic data calculation.

Highlights
  • Health and achievement sharing
  • Local community and event discovery
  • Health habit mastery and scoring
  • Competitive score comparison
  • Wearable device integration
  • Longevity progress tracking
Features
Read full description

- SHARE: Share your health, achievements, knowledge, workouts, and more with a friendly and encouraging community. - EXPLORE: Connect with local Don’t Die communities and events near you. - LEVEL UP: Master health habits by constantly improving your Don’t Die Score. - COMPETE: See how your Don’t Die Score compares with your friends, family, and Bryan Johnson. - MEASURE: Connect your wearable to automatically calculate your daily Don’t Die Score, and track your progress over time towards longevity best practices.

Screenshots

Function Health4 screens
Don't Die4 screens

Verdict

The call

The clearest difference is ratings volume: Function Health at 25K against Don't Die's 682. On price, rating, review sentiment 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. Neither carries in-app purchases, so what you see is what you pay.

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 Don't Die. That said, the two scores are not equally well evidenced: Function Health has 25K ratings behind it against 682, so its average is the more settled of the two. Written reviews are what separate them: 62% of Function Health's written reviews are positive against 69% of Don't Die's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on November 12, 2026 and November 9, 2026 respectively.

Scorecard1 real difference · 9 level
Function Health versus Don't Die: the parameters behind the verdict, then further details
ParameterFunction HealthDon't Die
PriceFreeFree
Rating4.9 (25K ratings) — better4.8 (682 ratings)
Positive reviews61.5% of reviews69.4% of reviews — better
Number of ratings25K — better682
Update frequencyWeeklyWeekly
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhoneiPhone, iPad — better
Requires iOS16.416.0 — better
Further details — not scored
Size206 MB54 MB
Age rating17+17+
DeveloperFunction HealthBlueprint Bryan Johnson

Customer experience

Function Health

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

Don't Die

All ratings682 ratings
Positive95.9%
Neutral2.2%
Negative1.9%
Written reviews108 reviews
Positive69.4%
Neutral5.6%
Negative25.0%

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

Don't Die

From 682 App Store ratings

What we love

  • 👍 Amazing community
  • 🚀 Great app interface
  • 💡 Interesting concept and mission
  • 👍 Engaging social experience
  • 👍 Seamless integration with health tracking

Room to improve

  • 🐛 Technical issues (glitches, freezing, crashes)
  • 🐛 Poor UX for certain features (e.g., replying to comments)
  • 🔒 Privacy concerns around data sharing
  • 🔧 Needs more polish and refinement

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

Don't Die

Reported bugs

3 issues
  • Difficulty verifying phone number
  • Issues with updating fitness levels and leaderboard
  • Compatibility problems on smaller devices

Requested features

3 requests
  • Option to use the app without linking personal data
  • Improved stability and performance
  • Enhanced leaderboard and fitness tracking features

In-app purchases

None

Function Health

No in-app purchases

None

Don't Die

No in-app purchases

Questions

Is Function Health free?
Function Health is free to download, with no in-app purchases.
Is Don't Die free?
Don't Die is free to download, with no in-app purchases.
Which has better reviews, Function Health or Don't Die?
Function Health is rated higher. Function Health averages 4.9 out of 5 from 25K ratings, while Don't Die averages 4.8 from 682 ratings.
Do Function Health or Don't Die have ads?
Neither Function Health nor Don't Die shows ads.
Which is updated more often, Function Health or Don't Die?
Function Health ships an update weekly, and Don't Die weekly. Most recently, Function Health was updated on November 12, 2026 and Don't Die on November 9, 2026.

Other comparisons