Comparison

Function Health vs Zephyrian

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

Zephyrian

This app helps you track your daily softgel intake and progress with a simple one-tap logging system. Set personalized reminders, store progress photos privately, and follow your deliveries. Access scientific studies and customer results to understand your journey.

Highlights
  • Daily softgel logging
  • Progress tracking with calendar
  • Customizable reminders
  • Private photo journal
  • Order tracking
  • Access to studies and timelines
Features
Read full description

Zephyrian is the daily companion for your Zephyrian softgels. ONE TAP A DAY Log your daily softgel and track your progress with the calendar. Consistency does the work. REMINDERS A daily nudge at the time of your choosing. PRIVATE PHOTO JOURNAL Progress photos stay on your phone. Sharing them with Zephyrian is optional and always asks first. ORDER TRACKING Follow your delivery inside the app. SUBSCRIPTION Manage your plan any time through your store account. LEARN The published studies behind skin carotenoids, real customer before & afters, and a week-by-week timeline of what to expect based on the latest scientific findings. — These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Screenshots

Function Health4 screens
Zephyrian4 screens

Verdict

The call

The clearest difference is ratings volume: Function Health at 25K against Zephyrian's 3. 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 — 4.9 for Function Health against 5.0 for Zephyrian. That said, the two scores are not equally well evidenced: Function Health has 25K ratings behind it against 3, so its average is the more settled of the two.

UpkeepUpdate frequency

Function Health ships an update weekly, Zephyrian every 8 days. The most recent releases landed on November 9, 2026 and October 31, 2026 respectively.

Scorecard1 real difference · 9 level
Function Health versus Zephyrian: the parameters behind the verdict, then further details
ParameterFunction HealthZephyrian
PriceFreeFree
Rating4.9 (25K ratings)5.0 (3 ratings) — better
Positive reviews61.5% of reviews—
Number of ratings25K — better3
Update frequencyWeekly — betterEvery 8 days
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhoneiPhone
Requires iOS16.416.4
Further details — not scored
Size206 MB54 MB
Age rating17+12+
DeveloperFunction HealthZephyrian

Customer experience

Function Health

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

Zephyrian

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

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

Zephyrian

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Function Health

No in-app purchases

None

Zephyrian

No in-app purchases

Questions

Is Function Health free?
Function Health is free to download, with no in-app purchases.
Is Zephyrian free?
Zephyrian is free to download, with no in-app purchases.
Which has better reviews, Function Health or Zephyrian?
Zephyrian is rated higher. Function Health averages 4.9 out of 5 from 25K ratings, while Zephyrian averages 5.0 from 3 ratings.
Do Function Health or Zephyrian have ads?
Neither Function Health nor Zephyrian shows ads.
Which is updated more often, Function Health or Zephyrian?
Function Health ships an update weekly, and Zephyrian every 8 days. Most recently, Function Health was updated on November 9, 2026 and Zephyrian on October 31, 2026.

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