Comparison

WHOOP 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

WHOOP

This wearable device and companion app provide in-depth health insights, including sleep, recovery, and strain levels. It offers personalized coaching and recommendations based on your body's unique physiology to help you achieve your health and fitness goals.

Highlights
  • Personalized Sleep Insights
  • Daily Recovery Score
  • Cardiovascular & Muscular Strain Measurement
  • Real-time Stress Score
  • Behavior Tracking & Guidance
  • AI-powered Health Coach
  • Menstrual Cycle Insights
Read full description

WHOOP is the leading wearable that turns comprehensive health insights into daily action. By capturing dozens of data points every second, WHOOP delivers personalized Sleep, Strain, Recovery, Stress, and health insights—24/7. WHOOP uses those insights to provide coaching based on your body’s unique physiology and recommends everything from when to go to bed to new daily behaviors that will help you reach your goals. If you’re new to WHOOP, you can try both the wearable and app free for 1 month. Terms and conditions apply. WHOOP is screenless, so all your data lives in the WHOOP app—for a distraction-free focus on your health. The WHOOP app requires a WHOOP wearable. How it works: Healthspan*: A powerful way to quantify your age and slow your Pace of Aging. Backed by leading longevity research, it pinpoints the daily habits that impact your long-term health. Sleep: WHOOP helps you understand how well you sleep each night by measuring your Sleep Performance. Every morning, WHOOP provides a Sleep score from 0 to 100%. Sleep Planner calculates how much sleep you need to recover, tailored to your habits, schedule, and goals. You can even set a Haptic Alarm that wakes when you're fully rested, or at a specific time, with gentle vibration. Quality sleep is essential for improving your healthspan, metabolic mental resilience, recovery, and performance. Recovery: WHOOP lets you know how ready you are to perform by measuring your heart rate variability, resting heart rate, sleep, and respiratory rate. You'll get a daily Recovery score on a scale of 1 to 99%. When you're in the green, you're ready for strain, when you're in the yellow or red, you may want to evaluate your training program. Strain: WHOOP does more than just track your activity–it measures cardiovascular and muscular exertion to give you the most comprehensive view of the demands you put on your body. Each day, Strain Target will provide a Strain score from 0 to 21 and recommend your optimal target exertion range based on your Recovery score. Stress: WHOOP gives you daily insights to pinpoint your stressors, understand your physiological response, and discover techniques to help manage. Get a real-time stress score from 0-3 and, based on your score, choose a breathwork session to enhance your alertness or increase relaxation. Behaviors: WHOOP tracks over 160+ daily habits and behaviors—like alcohol intake, medication, and more—to better understand how these behaviors impact your body. WHOOP provides weekly guidance for behavior change and helps set accountability goals with the Journal and Weekly Plan features. WHOOP Coach: Ask questions about your health & fitness and get highly personalized, on-demand answers. Using your unique biometric data, the latest performance science, and generative AI, WHOOP Coach generates responses on everything from training plans to why you’re feeling tired. Menstrual Cycle Insights: Go beyond period tracking to better understand your fifth vital sign and get tailored cycle-based insights. What else you can do in the WHOOP app: • Dig into the details: See heart rate zones, VO₂ Max, steps, and more trends over time to adjust your behaviors, training, sleep and more based on your goals. • Join a team: Stay motivated and accountable by joining a team. Chat directly with your teammates in the app, or as a coach, see how your team's training is going. • Apple Health: WHOOP integrates with Apple's Health app to sync activities and personalize your experience. WHOOP provides products and services designed for general fitness and wellness purposes. WHOOP products and services are not medical devices, not intended to treat or diagnose any disease, and should not be used as a substitute for professional medical advice, diagnosis or treatment. All content available through WHOOP products and services is for general informational purposes only. Discover the future of health and performance. *Some availability restrictions apply.

About

Function Health

Take control of your health with comprehensive lab testing, personalized protocols, and AI-powered insights. Understand your body's data, track changes over time, and make informed decisions for long-term wellness. Connect wearables and upload records for a complete health picture.

Highlights
  • 160+ lab tests annually
  • Personalized health protocols
  • Private AI Chat for results
  • Connect health wearables
  • Advanced MRI & CT scans
  • 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—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. PRIVATE AI CHAT Ask questions about your results, identify meaningful patterns, and figure out where to focus next, with Private AI Chat—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

WHOOP4 screens
Function Health4 screens

Verdict

The call

The clearest difference is monetization model: WHOOP at free with in-app purchases against Function Health's subscription. WHOOP also leads on chart position (#57 vs unranked) and ratings volume (87K vs 25K). Function Health's advantage is review sentiment (62% vs 41%) and iOS requirement (16.4 vs 18.0). On price, rating, update cadence and ads 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 — 4.8 for WHOOP against 4.9 for Function Health. Both are backed by a comparable volume of ratings — 87K and 25K respectively. Written reviews are what separate them: 41% of WHOOP's written reviews are positive against 62% of Function Health's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly weekly. Both last shipped on October 17, 2026.

Scorecard5 real differences · 6 level
WHOOP versus Function Health: the parameters behind the verdict, then further details
ParameterWHOOPFunction Health
PriceFreeFree
Rating4.8 (87K ratings)4.9 (25K ratings) — better
Positive reviews41.4% of reviews61.8% of reviews — better
Number of ratings87K — better25K
Update frequencyWeeklyWeekly
AdsNoNo
In-app purchasesNoNo
MonetizationFree with in-app purchases — betterSubscription
Best chart rank#57 — better—
DevicesiPhone, iPad — betteriPhone
Requires iOS18.016.4 — better
Further details — not scored
Size518 MB203 MB
Age rating12+17+
DeveloperWHOOPFunction Health

Customer experience

WHOOP

All ratings86,930 ratings
Positive95.6%
Neutral1.6%
Negative2.9%
Written reviews1,850 reviews
Positive41.4%
Neutral11.4%
Negative47.3%

Function Health

All ratings24,942 ratings
Positive99.0%
Neutral0.4%
Negative0.6%
Written reviews348 reviews
Positive61.8%
Neutral5.5%
Negative32.8%

User reviews

WHOOP

From 87K App Store ratings

What we love

  • 🚀 Great data and insights
  • 🔒 Accurate sleep and recovery tracking
  • 👍 Helpful for improving health and fitness
  • 🚀 Innovative concept and technology
  • 👍 Motivating and life-changing

Room to improve

  • 🐛 Connectivity issues and data sync problems
  • 🔋 Battery life concerns
  • 👎 Expensive subscription model
  • 👎 Poor customer service and support
  • 👎 Inaccurate data and metrics

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

WHOOP

Reported bugs

3 issues
  • Strap disconnecting frequently from app
  • Inconsistent and unreliable data tracking
  • App crashes and performance issues

Requested features

4 requests
  • Improved sleep and recovery suggestions
  • Better integration with other fitness apps and devices
  • More customization options for tracking
  • Ability to manually log activities and workouts

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

None

WHOOP

No in-app purchases

None

Function Health

No in-app purchases

Questions

Is WHOOP free?
WHOOP is free to download, with no in-app purchases.
Is Function Health free?
Function Health is free to download, with no in-app purchases.
Which has better reviews, WHOOP or Function Health?
Function Health is rated higher. WHOOP averages 4.8 out of 5 from 87K ratings, while Function Health averages 4.9 from 25K ratings.
Do WHOOP or Function Health have ads?
Neither WHOOP nor Function Health shows ads.
Which is updated more often, WHOOP or Function Health?
WHOOP ships an update weekly, and Function Health weekly. Most recently, WHOOP was updated on October 17, 2026 and Function Health on October 17, 2026.

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