HydraFill vs Calorie Burndown
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HydraFill
Visualize your daily water intake with an animated body silhouette that fills up with each logged drink. Track various beverages, set personalized goals, and receive custom reminders to stay hydrated. Share your progress with engaging visualizations.
- Animated body visualization of hydration
- Log 18+ drink types with custom icons
- Set personalized daily hydration goals
- Customizable drink reminders
- Build daily streaks and earn badges
- Sync with Apple Health
- Track caffeine intake
- Home screen widget for quick logging
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HydraFill—Hydration Tracker App See Your Hydration Come to Life Most hydration tracker apps show you a number. HydraFill shows you your body. Watch every drink fill your body silhouette with animated liquid in real-time. Water bubbles from your feet, tea layers across your waist, and coffee settles at your chest. Your hydration has never looked like this before. WHAT YOU CAN DO • Log drinks - Track water, coffee, tea, juice and 15+ drink types • Watch body fill - Animated liquid fills your silhouette in real-time • Set daily goals - Hydration targets based on your preferences • Get reminders - Custom drink reminders keep you hydrated • Build streaks • Share on Instagram - Export body visualization as interactive stories • Sync Apple Health - Your data syncs to your health records • Track caffeine - Monitor daily intake and health guidelines KEY FEATURES Smart Daily Goals Set personal hydration targets. See progress with percentage displays and remaining amounts. Body Visualization Colored liquid layers rise as you log drinks. Each drink has its own color and texture with realistic wave animations. Hydration Tracker Log 18+ drink types with custom icons and colors. Color-coded layers show exactly what you drank and when. Build Daily Streaks Daily streak tracking builds healthy habits. Earn badges and personal best records. Caffeine Tracker Track daily caffeine intake from coffee, tea, and energy drinks. Visual indicator shows your status. Learn more in Help & Support. Drink Reminders (Pro) Custom notifications remind you to drink throughout the day. Home Screen Widget Log +250ml water from your home screen. See daily progress at a glance. Apple HealthKit Integration Your hydration data syncs automatically to Apple Health. One source of truth for your wellness. Share Your Story Export body visualization as an Instagram Story sticker or animated video. Detailed Insights Daily, weekly, and monthly breakdowns show your hydration patterns and progress. HEALTH INFORMATION This app provides general wellness information. For detailed health guidelines and sources, visit: → Profile > Help & Support in the app → https://hydrafill.fit Hydration and caffeine information is based on general wellness guidelines. Always consult with a healthcare professional for personalized medical advice. Pro ($1.99/month): All 18+ drinks unlocked forever Zero ads — ever Full insights & analytics Custom drink reminders Priority support WHY HYDRAFILL? HydraFill is more than a hydration tracker—it's a visual wellness companion. Every drink you log creates satisfaction. Watching your body fill up makes health tracking engaging and fun. Whether you're building a healthier routine or optimizing hydration for fitness—HydraFill makes wellness visible and enjoyable. PRIVACY & SECURITY Your data is yours. Industry-standard encryption. No tracking, no selling data to third parties. Built by a developer passionate about health, design, and beautiful user experiences. Download HydraFill—the best hydration tracker for Apple devices. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Calorie Burndown
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Calorie Burndown answers one question the Health app doesn't: given what you've eaten and burned today, how much room do you have left? It reads those numbers straight from HealthKit, does the arithmetic against a goal you set, and shows the answer on your phone, your Lock Screen, and your wrist. WHAT YOU'LL NEED Calorie Burndown doesn't log food and doesn't estimate your metabolism — it reads what's already in Health. So you'll want a calorie-tracking app writing what you eat to Health, and an Apple Watch recording what you burn. If you already track both, this turns them into a number neither one gives you. If you don't, this app has nothing to read and won't be much use. EVERY FEATURE IS FREE No paywall, no subscription, nothing locked. The in-app purchases are optional tips — they unlock nothing, and the app behaves identically whether or not you ever use them. WORKS EVERYWHERE YOU DO - iPhone app with an iPad-optimized layout - A home screen widget that shows your remaining budget at a glance - Lock Screen widgets, so it's there without unlocking - A watchOS companion app with real-time numbers, even without your phone nearby - Watch face complications and Smart Stack widgets BUILT ON HEALTHKIT, NOT A SEPARATE DATABASE There's no food database here, no barcode scanner, and no second place to log things. Keep using whatever app you already use; Calorie Burndown reflects it automatically. Your health data is read on your device and never leaves it — there is no account, no server, and nothing to sign up for. YOUR WATCH WORKS ON ITS OWN The Watch app queries HealthKit directly, independent of your phone, so you get a real-time deficit number on a run or at the gym even if you left your phone at home. Settings and progress stay in sync across devices whenever they're near each other. WEEKLY CHECK-IN AND TRENDS A simple weekly check-in helps you see the bigger trend, not just today's number, and History charts your weight against the pace your target implies. IF YOU WANT TO SAY THANKS Settings has a tip jar with three sizes. That is the only place money is ever mentioned. It grants no features, removes no limits, and nothing in the app changes if you skip it. Calorie Burndown does not diagnose, treat, or provide medical advice — it's a simple deficit calculator built on data you're already tracking in Health.
Screenshots
Verdict
The clearest difference is in-app purchases: HydraFill at none against Calorie Burndown's 3. HydraFill also leads on iOS requirement (15.0 vs 26.5). Calorie Burndown's advantage is ads (none vs shown). On price, update cadence 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. Calorie Burndown sells 3 one-off in-app purchases. HydraFill asks for nothing beyond the download.
HydraFill ships an update every 2 days, Calorie Burndown every 3 days. The most recent releases landed on October 15, 2026 and October 31, 2026 respectively.
| Parameter | HydraFill | Calorie Burndown |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 2 days — better | Every 3 days |
| Ads | Yes | No — better |
| In-app purchases | No — better | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Requires iOS | 15.0 — better | 26.5 |
| Further details — not scored | ||
| Size | 102 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Parthkumar Saliya | Kevin McMahon |
In-app purchases
HydraFill
No in-app purchases
Calorie Burndown
- Buy me a coffee$1.99
- Buy me a few coffees$4.99
- Buy the whole round$9.99









