Comparison

Ozlo Sleepbuds 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

Ozlo Sleepbuds

Tiny, ultra-comfy headphones designed for optimal sleep. They offer all-night battery, noise blocking, audio streaming, and biometric sensing. The companion app allows for personalized settings and sleep data reporting.

Highlights
  • Ultra-comfy, low-profile design
  • All-night battery life
  • Noise blocking sleep sounds
  • Stream any audio content
  • Personal in-ear alarm
  • Biometric sleep sensing
  • Phone-free operation
Read full description

Ozlo Sleepbuds® 2 are tiny, ultra-comfy earbuds designed to give you the best sleep of your life. They come with all-night battery life, noise blocking, audio streaming, and biometric sensing. The Ozlo app allows you to personalize your Sleepbuds experience, with controls for all your important settings and reports for your sleep data. LUXURIOUS COMFORT Sleepbuds are surrounded with super soft, squishy silicone tips for unparalleled all-night comfort, even for side sleepers. And they're specifically designed to be low profile, so they don't stick out causing undue pressure on your ear like other earbuds. LONG BATTERY LIFE Sleepbuds can play for up to 14 hours for all-night noise masking or streaming. The Smart Case can provide 2-3 additional charges so you can take it with you anywhere you go. SOUND, DESIGNED FOR SLEEP Sleepbuds come with precisely tuned sound that helps to reduce the impact of disruptive noise like snoring, traffic, pets, and noisy neighbors. BLUETOOTH STREAMING Your bedtime routine, your way. Stream music, podcasts, audiobooks, and soundscapes that help you relax before falling asleep. PERSONAL IN-EAR ALARM Sleepbuds private in-ear alarm gently wakes you through your Sleepbuds instead of filling the room with sound. SLEEP MODES Choose how your Sleepbuds transition into your Sleep Sound throughout the night. Whether you prefer it to start immediately, after a timer, when you fall asleep, or after streaming ends, there’s a mode that fits your routine.ontrol how your Sleep Sound works through the night. PHONE-FREE CONTROLS The new Smart Case button gives you quick, simple control over your Sleepbuds without needing to reach for your phone in the dark. TIMER Automatically turns off streaming audio or Sleep Sounds after a set amount of time, so your audio doesn't need to play all night long. SLEEP PATTERNS See how your sleep improves over time with insights into your duration, consistency, and efficiency. ENVIRONMENTAL SENSORS Discover what shapes your sleep. Your Smart Case tracks your room’s noise, light, and temperature to reveal how your environment affects your sleep over time.

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

Ozlo Sleepbuds4 screens
Function Health4 screens

Verdict

The call

The clearest difference is monetization model: Ozlo Sleepbuds at free with in-app purchases against Function Health's subscription. Function Health's advantage is review sentiment (62% vs 44%) and rating (4.9 vs 4.7). 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.

ReceptionRating · Positive reviews · Number of ratings

Function Health holds the better App Store score, 4.9 against 4.7. That said, the two scores are not equally well evidenced: Function Health has 25K ratings behind it against 2.7K, so its average is the more settled of the two. Written reviews point the same way: 44% of Ozlo Sleepbuds's written reviews are positive against 62% of Function Health's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on October 19, 2026 and October 20, 2026 respectively.

Scorecard6 real differences · 5 level
Ozlo Sleepbuds versus Function Health: the parameters behind the verdict, then further details
ParameterOzlo SleepbudsFunction Health
PriceFreeFree
Rating4.7 (2.7K ratings)4.9 (25K ratings) — better
Positive reviews44.1% of reviews61.8% of reviews — better
Number of ratings2.7K25K — better
Update frequencyWeeklyWeekly
AdsNoNo
In-app purchasesNoNo
MonetizationFree with in-app purchases — betterSubscription
Best chart rank—#193 — better
DevicesiPhone, iPad — betteriPhone
Requires iOS18.016.4 — better
Further details — not scored
Size268 MB203 MB
Age rating12+17+
DeveloperDrowsy Digital Inc.Function Health

Customer experience

Ozlo Sleepbuds

All ratings2,666 ratings
Positive92.7%
Neutral1.7%
Negative5.6%
Written reviews383 reviews
Positive44.1%
Neutral13.6%
Negative42.3%

Function Health

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

User reviews

Ozlo Sleepbuds

From 2.7K App Store ratings

What we love

  • 💤 Comfortable for side sleeping
  • 🌙 Helps with sleep and tinnitus
  • 🔕 Blocks out noise like snoring
  • 🕰️ Alarm wakes user without disturbing partner
  • 🔊 Good sound quality and variety of sleep sounds

Room to improve

  • 🔌 Battery life issues, drains quickly
  • 📶 Bluetooth connectivity problems, frequent disconnections
  • 🤖 Glitchy app with stability and UX problems
  • 🔊 Limited volume control and sound options
  • ⚠️ Mandatory updates cause disruptions

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

Ozlo Sleepbuds

Reported bugs

4 issues
  • Earbuds not charging properly in case
  • Sync issues between left and right earbuds
  • App fails to connect or update firmware
  • Sleep timer function is not working as expected

Requested features

4 requests
  • Allow custom sleep sounds and playlists
  • Add phone-free mode to use without app
  • Improve alarm features to work with phone alarms
  • Expand sound library with more options like nature sounds

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

Ozlo Sleepbuds

No in-app purchases

None

Function Health

No in-app purchases

Questions

Is Ozlo Sleepbuds free?
Ozlo Sleepbuds 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, Ozlo Sleepbuds or Function Health?
Function Health is rated higher. Ozlo Sleepbuds averages 4.7 out of 5 from 2.7K ratings, while Function Health averages 4.9 from 25K ratings.
Do Ozlo Sleepbuds or Function Health have ads?
Neither Ozlo Sleepbuds nor Function Health shows ads.
Which is updated more often, Ozlo Sleepbuds or Function Health?
Ozlo Sleepbuds ships an update weekly, and Function Health weekly. Most recently, Ozlo Sleepbuds was updated on October 19, 2026 and Function Health on October 20, 2026.

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