Function Health vs 8bottle
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 160+ lab tests annually
- Personalized health protocols
- Private AI Chat for results
- Connect health wearables
- Advanced MRI & CT scans
- Upload health records
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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.
8bottle
Track your water intake and set personalized hydration goals with this smart companion app. It syncs with a smart bottle to provide reminders and motivate you through friendly competition. Your hydration habits also contribute to global water projects.
- Smart hydration tracking
- Personalized goal setting
- Real-time progress display
- Friend competition for motivation
- Global water project contributions
- Hydration tips and challenges
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Stay on top of your hydration with 8bottle, the smart water bottle designed for everyone. Track your water intake effortlessly with real-time progress displayed on the LED screen. Use the app to set personalized hydration goals tailored to your lifestyle. Compete with friends to stay motivated and make hydration fun. Monitor your global impact, contributing to water projects that bring clean, accessible water to everyone. Enjoy perfectly chilled water all day with advanced vacuum insulation. The fast wireless charging ensures your bottle is always ready. Ideal for work, gym, or home – elevate your hydration game with 8bottle. Explore how every drop contributes with the 8bottle app, your hydration planner. Utilize your smartphone to track water intake, set personalized hydration goals, and monitor progress. Sync with 8bottle for reminders to drink and enjoy perfectly chilled water throughout the day. Compete with friends for motivation and contribute to global water projects. The app also provides hydration tips, challenges, and curated content to keep you engaged and healthy. Elevate your hydration experience with 8bottle – because every bit counts towards a healthier you. Smart Hydration Tracking: 8bottle revolutionizes how you monitor your water intake. With its integrated LED screen and smartphone app, you can effortlessly track your hydration progress in real-time. Set personalized goals that adapt to your daily activities, ensuring you stay optimally hydrated throughout the day. Motivation and Engagement: Stay motivated with 8bottle by competing with friends and family to reach hydration goals. The app not only tracks your intake but also provides challenges and tips to keep you engaged. Whether you're at work, the gym, or home, 8bottle makes hydration a fun and rewarding part of your routine. Global Impact: Every sip with 8bottle contributes to global water projects, ensuring access to clean water for communities in need. Track your global impact through the app and see how your hydration habits are making a positive difference worldwide. Effortless Integration: Enjoy the convenience of perfectly chilled water all day long with advanced vacuum insulation. The bottle features fast wireless charging, ensuring it's always ready when you need it, wherever you are. With 8bottle, elevate your hydration game and discover how small changes in your daily routine can lead to significant health benefits. Stay hydrated, stay healthy, and make a meaningful impact with every sip. 8bottle is designed to enhance hydration and promote wellness. The products and services offered by 8bottle are intended for general hydration purposes and should not be considered medical devices. They are not intended to diagnose, treat, or prevent any disease. 8bottle should not be used as a substitute for professional medical advice, diagnosis, or treatment. All information provided by 8bottle, including through its app and other services, is for general informational purposes only. For specific health concerns or medical advice, please consult with a qualified healthcare professional.
Screenshots
Verdict
Function Health and 8bottle both sit at 4.9 stars, but that hides the real split: 100% of 8bottle's written reviews are positive against 62% of Function Health's. 8bottle also leads on monetization model (free vs subscription) and iOS requirement (14.0 vs 16.4). Function Health's advantage is ratings volume (25K vs 8) and update cadence (weekly vs fortnightly). On price, rating, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 4.9 for Function Health against 5.0 for 8bottle. That said, the two scores are not equally well evidenced: Function Health has 25K ratings behind it against 8, so its average is the more settled of the two. Written reviews are what separate them: 62% of Function Health's written reviews are positive against 100% of 8bottle's.
Function Health ships an update weekly, 8bottle fortnightly. The most recent releases landed on October 16, 2026 and October 3, 2026 respectively.
| Parameter | Function Health | 8bottle |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (25K ratings) | 5.0 (8 ratings) — better |
| Positive reviews | 62.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 25K — better | 8 |
| Update frequency | Weekly — better | Fortnightly |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Subscription | Free — better |
| Best chart rank | #205 — better | — |
| Devices | iPhone | iPhone, iPod — better |
| Requires iOS | 16.4 | 14.0 — better |
| Further details — not scored | ||
| Size | 202 MB | 49 MB |
| Age rating | 17+ | 4+ |
| Developer | Function Health | 8bottle Inc |
Customer experience
Function Health
8bottle
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
8bottle
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Function Health
No in-app purchases
8bottle
No in-app purchases









