Immortals Bryan Johnson vs Thirsty Day
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Immortals Bryan Johnson
This app helps you create a personalized longevity plan based on your health data and expert research. It connects with wearables and lab results to provide adaptive insights and actionable advice for improving your health.
- Personalized longevity protocol
- Connects with wearables (Apple Watch, Fitbit, etc.)
- Uploads lab results and biomarkers
- Adaptive health insights
- AI-powered health advice
- Expert-designed framework
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Immortals is a free app* that helps you build a personalized longevity protocol. It’s backed by Bryan Johnson’s 5+ years of longevity research and informed by your health data** START FOR FREE + Connect any wearable: Apple Watch, Eight Sleep, Fitbit, Garmin, Google Fit, Oura, and Whoop + Upload existing biomarkers or labs from any provider + Get insights that adapt to your inputs HOW IT WORKS BryanAI reads your data, cross-references it against Bryan's protocol and population-level research, and helps you focus on the most impactful things you can do for your health. It's free and adapts to your biology. No clinician visit required to start. BRYANAI Bryan Johnson's team of longevity experts built an algorithm to run his body. It reads his data and tells him how to build his protocol based on how his body responds. BryanAI gives everyone access to that same framework. You can ask BryanAI questions like: "What's driving my HRV drop?" "Am I getting enough protein for my training load?" "Should I train cardio today?" BryanAI is continuously reviewed and refined by leading AI experts in longevity, nutrition, exercise, and sleep. DESIGNED BY LONGEVITY EXPERTS Carl Seger, M.D. Board-Certified Physician specializing in preventive and longevity medicine. IMMORTALS SUPPORT: support@immortals.com *This App is not a Medical Device **Not intended to diagnose, treat, cure, or prevent any disease. For informational purposes only. Does not constitute medical advice, treatment, or a diagnosis.
Thirsty Day
Track your daily fluid intake with a charming animal companion. Log various drinks, set personalized goals, and receive optional reminders. Sync with Apple Health and enjoy features across iPhone, iPad, and Apple Watch.
- Log water, coffee, tea, and other drinks
- Track total fluids, plain water, and caffeine
- Set custom daily hydration goals
- Receive optional reminders and use widgets
- Interactive animal companions
- Apple Watch quick logging
- Sync with Apple Health
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A little company for every sip. Thirsty Day makes it easy to keep track of your drinks, get to know your daily rhythm and enjoy a little animal company along the way. LOG YOUR DAY, YOUR WAY • Quick-add water or log coffee, tea and other drinks • See total fluids, plain water and caffeine separately • Edit caffeine estimates to match your label, including zero • Set your own daily goal in ounces or milliliters • Use optional reminders and Home Screen widgets YOU AND YOUR COMPANION See today's drinks alongside your animal's playful scale while keeping your own goal. Daily animal amounts are rough illustrations, not drinking targets. Some companions offer water facts rather than a volume comparison; Mythic scales are fictional. Say hello to your companion and swipe through hydration and animal facts with source links. Explore the field guide and save favorites. WITH YOU THROUGH THE DAY • Quick-log water from your Apple Watch for the profile shown on your paired iPhone • Enjoy roomy iPad layouts or keep things close on either iPhone Duo display • Use portrait, landscape or a smaller iPad window Watch drinks are saved when your phone is out of reach and transferred when it reconnects. Watch logging and iPad support are included in the core app. Apple Watch needs a paired iPhone with Thirsty Day. Your iPhone and iPad keep separate local journals; they do not automatically sync drink history. COMPANY YOU CAN KEEP Start with Otter. Earn Cat, Dog, Fox and Lion through logging streaks. Household profiles, kids' manual goals, facts and basic tracking remain available without Pro. Kids never receive adult activity or heat adjustments. Optional iCloud Squad Sync shares daily progress with friends you add. THIRSTY PRO Give your day a companion you love and a water estimate that can adapt to local weather and available activity. Monthly and yearly plans include classic and wildlife companions, 18 matching stickers to copy or share, and adaptive goal guidance. See how feels-like temperature, humidity and available Apple Health activity contribute to the estimate, and choose which inputs to enable. Weather and Health permissions are optional. Both plans provide the same Pro features. In the U.S.: $1.99/month or $9.99/year. Local prices and terms are shown before purchase. Subscriptions renew automatically unless canceled at least 24 hours before the current period ends. Payment is charged to your Apple Account at confirmation. Manage or cancel in your App Store account settings. Already own lifetime Pro? Your access stays yours; no subscription is required for those features. Eligible early-supporter rights, the four wildlife companions granted before version 3.1, earned companions and individual purchases are preserved. Restore purchases to recover verified access. Mythic Creatures remains a separate optional one-time collection; individual companion purchases remain available. QUIET AND PRIVATE No ads. Basic Apple Health water syncing and available health metrics stay in the core app with your permission. Only plain, caffeine-free water—including unflavored sparkling water—can be written to Health; other drink details and caffeine remain in your local log. Health data is never sold. Weather uses approximate location with permission. Hydration and caffeine amounts are estimates, not medical advice. Follow your clinician's guidance, especially for fluid restrictions. Privacy: https://apps-privacy-stable.imaginary-grey.workers.dev/thirsty-privacy Terms: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Made thoughtfully by House Rhymaun.
Screenshots
Verdict
The clearest difference is rating: Thirsty Day at 5.0 against Immortals Bryan Johnson's 3.6. Thirsty Day also leads on update cadence (daily vs every 4 days). Immortals Bryan Johnson's advantage is in-app purchases (none vs 10) and ratings volume (29 vs 2). On price, ads and device support 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. Thirsty Day sells 10 in-app purchases, starting at $1.99 per month. Immortals Bryan Johnson asks for nothing beyond the download.
Thirsty Day holds the better App Store score, 5.0 against 3.6. That said, the two scores are not equally well evidenced: Immortals Bryan Johnson has 29 ratings behind it against 2, so its average is the more settled of the two.
Immortals Bryan Johnson ships an update every 4 days, Thirsty Day daily. The most recent releases landed on November 11, 2026 and November 6, 2026 respectively.
| Parameter | Immortals Bryan Johnson | Thirsty Day |
|---|---|---|
| Price | Free | Free |
| Rating | 3.6 (29 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 11.1% of reviews | — |
| Number of ratings | 29 — better | 2 |
| Update frequency | Every 4 days | Daily — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Freemium |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Requires iOS | 15.1 — better | 17.0 |
| Further details — not scored | ||
| Size | 95 MB | 65 MB |
| Age rating | 17+ | 4+ |
| Developer | Blueprint Bryan Johnson | Marc Rhymaun |
Customer experience
Immortals Bryan Johnson
Thirsty Day
In-app purchases
Immortals Bryan Johnson
No in-app purchases
Thirsty Day
- Thirsty Pro Monthly$1.991 Month
- Thirsty Pro Yearly$9.991 Year
- Fox$0.99
- Tiger$0.99
- Elephant$0.99
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- Golden Mossback$0.99
- Whale$0.99
- Orbit Sprite$0.99
- Emberwing$0.99
- Moonhorn$0.99
Questions
Is Immortals Bryan Johnson free?
Is Thirsty Day free?
Which has better reviews, Immortals Bryan Johnson or Thirsty Day?
Do Immortals Bryan Johnson or Thirsty Day have ads?
Which is updated more often, Immortals Bryan Johnson or Thirsty Day?
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