Comparison

Function Health vs Flyku

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

Head to head
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.

About

Flyku

Features
Read full description

Flyku is the world’s largest hub for runners, bringing together running clubs, training tools, and apparel in one powerful platform. Whether you're a beginner starting your first run or an experienced athlete chasing your next PR, Flyku helps you connect, train, and level up your running journey. Discover Running Clubs Find and join running clubs near you or across the globe. Connect with like-minded runners, participate in group runs, and stay motivated together. Train Smarter Access structured training programs, track your progress, and improve your performance with tools designed for runners of all levels. Explore Running Apparel Browse and discover the latest running gear and apparel—all in one place. Find what you need to perform at your best. Global Running Community Be part of a growing network of runners. Share your journey, discover new routes, and get inspired by others around the world. Personalized Experience Get tailored recommendations for clubs, training plans, and gear based on your preferences and goals. Why Flyku? Largest running club network Built for all levels of runners Training + community + gear in one app Discover and connect globally Simple, fast, and powerful experience Whether you run for fitness, competition, or passion—Flyku is your ultimate running companion.

Screenshots

Function Health4 screens
Flyku4 screens

Verdict

The call

The clearest difference is device support: Flyku at 3 against Function Health's 1. On price, update cadence, ads and in-app purchases 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.

UpkeepUpdate frequency

Function Health ships an update weekly, Flyku every 2 weeks. The most recent releases landed on October 17, 2026 and September 30, 2026 respectively.

Scorecard1 real difference · 9 level
Function Health versus Flyku: the parameters behind the verdict, then further details
ParameterFunction HealthFlyku
PriceFreeFree
Rating4.9 (25K ratings) — better—
Positive reviews61.8% of reviews—
Number of ratings25K — better—
Update frequencyWeekly — betterEvery 2 weeks
AdsNoNo
In-app purchasesNoNo
MonetizationSubscription—
DevicesiPhoneiPhone, iPad, iPod — better
Requires iOS16.415.1 — better
Further details — not scored
Size203 MB45 MB
Age rating17+4+
DeveloperFunction HealthSystemStar LLC

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

Flyku

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Function Health

No in-app purchases

None

Flyku

No in-app purchases

Questions

Is Function Health free?
Function Health is free to download, with no in-app purchases.
Is Flyku free?
Flyku is free to download, with no in-app purchases.
Do Function Health or Flyku have ads?
Neither Function Health nor Flyku shows ads.
Which is updated more often, Function Health or Flyku?
Function Health ships an update weekly, and Flyku every 2 weeks. Most recently, Function Health was updated on October 17, 2026 and Flyku on September 30, 2026.

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