Comparison

Function Health vs 3B Method

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

3B Method

Features
Read full description

3B Method – Your Exclusive Fitness & Nutrition App Unlock the full potential of your fitness journey with the 3B Method App, designed exclusively for members of 3B Method. This all-in-one platform keeps you connected, accountable, and on track with your personal health and performance goals. With 3B Method, you’ll gain direct access to your trainer, programs, and tools that drive real, lasting results: Personalized Training Programs – View and follow your workouts anytime, anywhere, designed specifically for your goals. Custom Nutrition Tracking – Balance your nutrition with tailored meal guidance and food logging to optimize energy, performance, and recovery. Trainer Support & Accountability – Message your coach directly, receive expert feedback, and stay motivated with professional guidance at every step. Remote & In-Person Integration – Whether you train in the studio or on the go, your full program and progress are always at your fingertips. Progress Tracking Made Simple – Log workouts, track body composition, and measure results over time with a sleek and intuitive interface. The 3B Method App is more than just fitness tracking—it’s a membership experience designed to help you Burn Fat, Build Muscle, and Balance Nutrition with expert support and proven methods.

Screenshots

Function Health4 screens
3B Method4 screens

Verdict

The call

The clearest difference is update cadence: Function Health at weekly against 3B Method's every 3 weeks. Function Health also leads on chart position (#202 vs unranked). 3B Method's advantage is device support (4 vs 1). On price, ads, in-app purchases and iOS requirement 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, 3B Method every 3 weeks. The most recent releases landed on October 21, 2026 and October 15, 2026 respectively.

Scorecard3 real differences · 8 level
Function Health versus 3B Method: the parameters behind the verdict, then further details
ParameterFunction Health3B Method
PriceFreeFree
Rating4.9 (25K ratings) — better—
Positive reviews61.8% of reviews—
Number of ratings25K — better—
Update frequencyWeekly — betterEvery 3 weeks
AdsNoNo
In-app purchasesNoNo
MonetizationSubscription—
Best chart rank#202 — better—
DevicesiPhoneiPhone, iPad, iPod, Apple Watch — better
Requires iOS16.415.1 — better
Further details — not scored
Size203 MB166 MB
Age rating17+4+
DeveloperFunction HealthUPTOWN ATHLETICS, 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

3B Method

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Function Health

No in-app purchases

None

3B Method

No in-app purchases

Questions

Is Function Health free?
Function Health is free to download, with no in-app purchases.
Is 3B Method free?
3B Method is free to download, with no in-app purchases.
Do Function Health or 3B Method have ads?
Neither Function Health nor 3B Method shows ads.
Which is updated more often, Function Health or 3B Method?
Function Health ships an update weekly, and 3B Method every 3 weeks. Most recently, Function Health was updated on October 21, 2026 and 3B Method on October 15, 2026.

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