Comparison

Eight Sleep vs Function Health

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

Head to head
About

Eight Sleep

This advanced sleep system intelligently adjusts temperature and elevation for personalized comfort. It tracks detailed sleep metrics and provides insights to help you wake up refreshed. The system supports up to two users with individual profiles and learns over time.

Highlights
  • Personalized temperature control
  • Automatic sleep stage tracking
  • Heart rate and HRV monitoring
  • Smart alarm with vibration
  • Dual user sleep profiles
  • AI-driven sleep insights
Read full description

Introducing Pod 6. The setup is as effortless as your sleep. Guided Hub setup gets you paired in minutes, a live priming screen decodes your Pod's lights in real time so you're never guessing, and Solo Pod owners get a path built just for them. Your best sleep starts tonight. The Eight Sleep Pod is the intelligent sleep system that gives you up to one hour more of sleep every night. It cools. It heats. It elevates. PERSONALIZED SLEEP WITH AUTOPILOT Autopilot is the intelligence behind the Pod. It adjusts your temperature and elevation to perfect your sleep experience. LEARN ABOUT YOUR SLEEP AND HEALTH View your sleep stages, time slept, heart rate, HRV, and snoring. Plus, receive personalized insights and recommendations. WAKE UP REFRESHED With customizable chest-level vibration and a gradual thermal change, you will wake up gently and feel fully refreshed. TWO SLEEP PROFILES PER POD Autopilot creates a profile for up to two individuals on the same Pod and refines overtime. Have questions? We’re here to help. Email us at support@eightsleep.com. Terms of Use: - www.eightsleep.com/app-terms-conditions/ - www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Function Health

Gain deep insights into your health with advanced lab testing, personalized protocols, and AI-powered chat. Understand your body's evolution and make informed changes with data-backed guidance. Includes options for advanced imaging and convenient blood draws.

Highlights
  • 160+ lab tests annually
  • Personalized health protocols
  • Private AI Chat for results
  • Advanced MRI & CT scan options
  • Home or office blood draws
  • 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.

Screenshots

Eight Sleep4 screens
Function Health4 screens

Verdict

The call

The clearest difference is in-app purchases: Function Health at none against Eight Sleep's 2. Function Health also leads on review sentiment (62% vs 29%) and iOS requirement (16.4 vs 18.0). 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. Eight Sleep sells 2 in-app purchases, starting at $18.99 per month. Function Health asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Function Health holds the better App Store score, 4.9 against 4.8. Both are backed by a comparable volume of ratings — 18K and 25K respectively. Written reviews point the same way: 29% of Eight Sleep's written reviews are positive against 62% of Function Health's.

UpkeepUpdate frequency

Eight Sleep ships an update every 4 days, Function Health weekly. Both last shipped on November 6, 2026.

Scorecard4 real differences · 6 level
Eight Sleep versus Function Health: the parameters behind the verdict, then further details
ParameterEight SleepFunction Health
PriceFreeFree
Rating4.8 (18K ratings)4.9 (25K ratings) — better
Positive reviews28.7% of reviews61.5% of reviews — better
Number of ratings18K25K — better
Update frequencyEvery 4 days — betterWeekly
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad — betteriPhone
Requires iOS18.016.4 — better
Further details — not scored
Size259 MB206 MB
Age rating12+17+
DeveloperEight Sleep, IncFunction Health

Customer experience

Eight Sleep

All ratings17,805 ratings
Positive94.4%
Neutral1.3%
Negative4.2%
Written reviews832 reviews
Positive28.7%
Neutral11.1%
Negative60.2%

Function Health

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

User reviews

Eight Sleep

From 18K App Store ratings

What we love

  • 🚀 Amazing sleep quality
  • 🌡️ Effective temperature control
  • 📊 Detailed sleep tracking
  • 🤖 Helpful AI features
  • 🏆 Great customer service

Room to improve

  • 🐛 Buggy app with frequent crashes
  • 🔌 Requires constant internet connection
  • 🕰️ Alarm and temperature controls not intuitive
  • 🔄 Inconsistent sleep data and metrics
  • 💰 Expensive with mandatory subscription

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

Bugs and requests

Eight Sleep

Reported bugs

5 issues
  • App freezes and loses connection to pod
  • Alarms not working or turning off properly
  • Temperature settings not saving or resetting
  • Sleep data not syncing or displaying accurately
  • Frequent app crashes and performance issues

Requested features

5 requests
  • Apple Watch app integration
  • Offline temperature/alarm controls
  • Customizable sleep tracking and insights
  • Improved alarm snooze/dismiss functionality
  • Nap mode and more sleep schedule flexibility

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

In-app purchases

2 purchases

Eight Sleep

Subscriptions2
  • 8+ Pro (Monthly)$18.991 Month
  • 8+ Pro (Annual)$179.991 Year
None

Function Health

No in-app purchases

Questions

Is Eight Sleep free?
Eight Sleep is free to download, with in-app purchases available.
Is Function Health free?
Function Health is free to download, with no in-app purchases.
Which has better reviews, Eight Sleep or Function Health?
Function Health is rated higher. Eight Sleep averages 4.8 out of 5 from 18K ratings, while Function Health averages 4.9 from 25K ratings.
Do Eight Sleep or Function Health have ads?
Neither Eight Sleep nor Function Health shows ads.
Which is updated more often, Eight Sleep or Function Health?
Eight Sleep ships an update every 4 days, and Function Health weekly. Most recently, Eight Sleep was updated on November 6, 2026 and Function Health on November 6, 2026.

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