Comparison

Hydrate App vs KLU Longevity

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Hydrate App

Effortlessly track your daily water intake and monitor progress towards personalized hydration goals. Log various beverages quickly and visualize your achievements with a clean, colorful ring. Gain insights into your hydration habits over time.

Highlights
  • Log any drink in seconds
  • Set personalized daily hydration goals
  • Visualize progress with a colorful ring
  • View daily, weekly, and long-term trends
  • Supports light and dark mode
  • Fast and simple user interface
Features
Read full description

Hydrate makes it effortless to drink enough water and to see exactly what you're drinking all day. Log any drink in a couple of taps, set a goal that fits you, and watch your progress fill a clean, colorful ring. Completely free. No ads, no subscriptions, no paywalls. Every feature is yours from the start. If Hydrate helps you, you can leave an optional tip to support development, but you never have to. Whether you're a busy professional, a fitness enthusiast, or just trying to build a healthier habit, Hydrate keeps it simple. WHAT YOU CAN DO Log in seconds — water, coffee, tea, juice, sport drinks, and more, with no fussy forms Set your goal — a personalized daily target that adapts to you, whether you sip or guzzle See your day at a glance — a live ring shows how close you are as you go Spot your trends — daily, weekly, and long-term insights reveal your real habits WHY YOU'LL LIKE IT Free and fair — no ads, no subscriptions, ever Fast and simple — no learning curve, no clutter Beautiful in light and dark mode Quick enough that you'll actually stick with it Staying properly hydrated supports your energy, focus, and physical performance. Hydrate just makes it easy to keep up. Download Hydrate free and make drinking enough the easiest part of your day.

About

KLU Longevity

Features
Read full description

Your blood holds the clues to your health — KLU helps you understand them. Snap a photo or upload a PDF of your blood test results, and KLU analyzes up to 87 biomarkers across 12 body systems — from heart health and metabolism to hormones and inflammation. Connect your wearables for a complete picture of your wellness. What you get: - A personalized Longevity Score that tracks how well your body is aging - Your estimated Biological Age — a wellness indicator based on your biomarker profile - Color-coded biomarker breakdowns so you see what's in range and what may need attention - Trend tracking across multiple blood tests to monitor changes over time - Fitness and recovery insights from your wearable devices - An AI Longevity Coach you can ask questions about your results Wearable & Health Integrations: - Apple Health — reads steps, heart rate, resting heart rate, sleep duration, active calories, and blood oxygen (SpO2) to complement your blood test insights. KLU does not write data to Apple Health. - Oura Ring — connect your account to sync sleep, readiness, activity, and heart rate data. - WHOOP — connect your account to sync recovery, strain, sleep, and workout data. All wearable connections are optional and require your explicit authorization. How it works: 1. Upload your blood test (photo or PDF) 2. KLU extracts and organizes your biomarkers automatically 3. Optionally connect Apple Health, Oura, or WHOOP for fitness data 4. Review your score, trends, and educational insights Understand your labs. Talk to your doctor with confidence. Important: KLU is designed for informational and educational purposes only. It is not a medical device and is not intended to diagnose, treat, cure, or prevent any disease. It does not provide medical advice, diagnoses, or treatment recommendations. The information provided by KLU is not a substitute for professional medical advice. Always consult a qualified healthcare provider before making any decisions about your health. Your blood test data is processed using third-party AI services to extract and analyze biomarker values. Health and fitness data from connected devices is stored securely and used solely to provide you with personalized wellness insights.

Screenshots

Hydrate App4 screens
KLU Longevity4 screens

Verdict

The call

The clearest difference is update cadence: KLU Longevity at every 3 weeks against Hydrate App's every 16 months. KLU Longevity also leads on iOS requirement (16.6 vs 27.0). On price, ads, in-app purchases 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

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

Hydrate App ships an update every 16 months, KLU Longevity every 3 weeks. The most recent releases landed on September 15, 2026 and August 31, 2026 respectively.

Scorecard2 real differences · 7 level
Hydrate App versus KLU Longevity: the parameters behind the verdict, then further details
ParameterHydrate AppKLU Longevity
PriceFreeFree
Rating5.0 (1 ratings) — better
Number of ratings1 — better
Update frequencyEvery 16 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree
DevicesiPhone, Apple Watch — betteriPhone
Requires iOS27.016.6 — better
Further details — not scored
Size13 MB92 MB
Age rating4+17+
DeveloperDigitizr LLCLifeUnlocked s.r.o.

In-app purchases

None

Hydrate App

No in-app purchases

None

KLU Longevity

No in-app purchases

Questions

Is Hydrate App free?
Hydrate App is free to download, with no in-app purchases.
Is KLU Longevity free?
KLU Longevity is free to download, with no in-app purchases.
Do Hydrate App or KLU Longevity have ads?
Neither Hydrate App nor KLU Longevity shows ads.
Which is updated more often, Hydrate App or KLU Longevity?
Hydrate App ships an update every 16 months, and KLU Longevity every 3 weeks. Most recently, Hydrate App was updated on September 15, 2026 and KLU Longevity on August 31, 2026.

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