Comparison

SleepStream 2 Ultimate 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

SleepStream 2 Ultimate

This app provides a comprehensive suite of tools to enhance sleep and relaxation. It offers a variety of calming sounds, guided meditations, and visual experiences designed to help users unwind and achieve restful sleep.

Highlights
  • Quality audio with calming sounds
  • Guided meditations and music
  • Breathtaking visualizations and moodlights
  • Binaural & Isochronic brainwave programs
  • Unique audio engine for sound mixing
  • AirPlay support
Features
Read full description

Whether you sleep to dream, rest to recharge, or simply nap just to get by, the hours you spend in bed are probably the most important hours of the day. Recognized as the premier sleep and relaxation aid, SleepStream 2 has been recommended by 148Apps, Dr. Oz, iPhonefreak, Health Magazine, TVN, The Daily App Show, Appolicious and thousands of satisfied customers. Think about the difficulties you’ve had trying to sleep. Maybe you were battling a wired mind, racing through a million different thoughts; or perhaps trying to drown out the sound of an unsettled baby, crying from a nearby airplane seat. In a life full of distractions like these, all you’d like is a window of peace and quiet – or at least a few hours of undisturbed rest and relaxation. Thankfully, SleepStream 2 not only assists in capturing a full night’s slumber, but it does so in a way that results in an absolute bodily recharge everytime you close your eyes. Main features: - 8 Hours of Quality Audio Each of SleepStream’s calming sounds or piece of music has been handpicked and carefully crafted to remove irritating frequencies and volume inconsistencies. - Guided Meditations & Music Sometimes you need just a little bit more to shake the stress of a long, hard day. So, SleepStream 2 now has the ability to mix background sounds with guided meditations and music. Including four guided meditations for sleep, relaxation, motivation and energy, and hours of calming, soul-soothing music. - Breathtaking Visualizations, Wallpapers & Moodlights, SleepStream 2 gives you a complete visual getaway, thanks to the scenic pictures and video loops that can be viewed while listening to the app’s audio programs. Visualizations now include a new moodlight feature, where randomly generated plasma images flow across the screen in a harmony of colors and textures. You’ll have no choice but to drift into a world of relaxation. - 140 Binaural & Isochronic Brainwave Programs – 15 Categories To stimulate the brain’s activity associated with relaxation, sleep and focused states of being, SleepStream 2 also offers 140 specially designed brainwave programs for a full and complete, integrated sound experience. SleepStream’s 15 brainwave categories include sleep, relaxation, energy, focus, meditation, hypnosis, learning, mood, motivation, creativity, lucid dreaming & more. - Unique Audio Engine & Sound Generators Sleepstream’s audio engine randomly combines hundreds of different sounds, giving you a new experience everytime the app is used. Mix background sounds, music, guided meditations and brainwave programs in any combination for maximum relaxation, night after night. - AirPlay Support Play SleepStream audio on AirPlay enabled speakers and receivers. - Best of All: All Present and Future Premium Downloads are Free! Our loyal Sleepstream users tell us that they don´t want to pay for downloads! We listened! Sleepstream 2 Ultimate buys you the latest version of SleepStream 2 for both iPhone and iPad, and all present and future premium downloads are free – a saving of $23 compared to obtaining the downloads through in-app purchases in the other SleepStream 2 versions. - Many Uses – Even When You’re Awake! Equipped with functional timer, SleepStream makes it easy to enjoy power naps. Just engage the timer and alarm, and SleepStream will gently wake you after your session has ended. But don’t stop there – the app is also perfect for relaxation, meditation, noise masking, yoga, and pure enjoyment. SleepStream 2 was developed in conjunction with recognized sleep and relaxation experts, certified hypnotherapists and trained audio professionals to ensure a soothing sleep experience that is difficult to attain through traditional means. Don’t let the stress of everyday life get the best of you, depriving you of your ability to focus, relax, and most importantly rest - get Sleepstream 2 Ultimate today and be refreshed and ready for tomorrow.

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

SleepStream 2 Ultimate4 screens
Function Health4 screens

Verdict

The call

The clearest difference is price: Function Health at Free against SleepStream 2 Ultimate's $9.99. Function Health also leads on rating (4.9 vs 4.5) and update cadence (weekly vs every 2 months). SleepStream 2 Ultimate's advantage is review sentiment (81% vs 62%) and device support (3 vs 1). On 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

Function Health is free to download; SleepStream 2 Ultimate costs $9.99 up front. 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 4.5. That said, the two scores are not equally well evidenced: Function Health has 25K ratings behind it against 188, so its average is the more settled of the two. Written reviews complicate that: 81% of SleepStream 2 Ultimate's written reviews are positive against 62% of Function Health's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

SleepStream 2 Ultimate ships an update every 2 months, Function Health weekly. The most recent releases landed on October 17, 2026 and October 20, 2026 respectively.

Scorecard9 real differences · 2 level
SleepStream 2 Ultimate versus Function Health: the parameters behind the verdict, then further details
ParameterSleepStream 2 UltimateFunction Health
Price$9.99Free — better
Rating4.5 (188 ratings)4.9 (25K ratings) — better
Positive reviews81.3% of reviews — better61.8% of reviews
Number of ratings18825K — better
Update frequencyEvery 2 monthsWeekly — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaid — betterSubscription
Best chart rank—#205 — better
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS9.0 — better16.4
Further details — not scored
Size32 MB203 MB
Age rating12+17+
DeveloperExplosive AppsFunction Health

Customer experience

SleepStream 2 Ultimate

All ratings188 ratings
Positive85.6%
Neutral3.2%
Negative11.2%
Written reviews193 reviews
Positive81.3%
Neutral5.2%
Negative13.5%

Function Health

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

User reviews

SleepStream 2 Ultimate

From 188 App Store ratings

What we love

  • 👍 Helps with sleep, relaxation, and focus
  • 🚀 Customizable sound options
  • 💡 Variety of binaural beats and overlays
  • 👍 Useful for meditation and anxiety reduction
  • 👍 Helps with tinnitus and headaches

Room to improve

  • 🐛 Crashes when trying to download additional content
  • 🔍 App not updated in years, feels outdated
  • 💰 Expensive for an app that hasn't been updated
  • 🔍 Scaling issues on iPad Pro
  • 🔍 Difficulty navigating and selecting options

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

SleepStream 2 Ultimate

Reported bugs

3 issues
  • Crashes when trying to download additional content
  • Scaling issues on iPad Pro
  • Difficulty navigating and selecting options

Requested features

5 requests
  • Longer timer options (up to 8 hours)
  • Sleep analysis and tracking features
  • More guided meditations and new sound content
  • Ability to import custom music/sounds
  • Airplay and Bluetooth speaker support

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

SleepStream 2 Ultimate

No in-app purchases

None

Function Health

No in-app purchases

Questions

Is SleepStream 2 Ultimate free?
SleepStream 2 Ultimate costs $9.99, with no in-app purchases.
Is Function Health free?
Function Health is free to download, with no in-app purchases.
Which has better reviews, SleepStream 2 Ultimate or Function Health?
Function Health is rated higher. SleepStream 2 Ultimate averages 4.5 out of 5 from 188 ratings, while Function Health averages 4.9 from 25K ratings.
Do SleepStream 2 Ultimate or Function Health have ads?
Neither SleepStream 2 Ultimate nor Function Health shows ads.
Which is updated more often, SleepStream 2 Ultimate or Function Health?
SleepStream 2 Ultimate ships an update every 2 months, and Function Health weekly. Most recently, SleepStream 2 Ultimate was updated on October 17, 2026 and Function Health on October 20, 2026.

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