Hydro Paint vs Intermittent
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Hydro Paint
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Hydro Paint turns daily hydration into a quiet ritual with art. Each day starts with a blank canvas. As you drink, layers of a classic ukiyo-e painting are gradually revealed. Tilt your phone and the painting responds with parallax and light. Tap the card and it sways. Reach your goal and the full artwork comes alive with a celebration. Currently featuring three interactive paintings from Hokusai's "Thirty-six Views of Mount Fuji," with more works by Hiroshige, Koitsu, and others on the way. FEATURES • Art Card with motion parallax, dynamic lighting, and tap interaction — powered by device sensors • Ukiyo-e masterworks with hand-separated layers that reveal as you hydrate • Radial quick-add menu: long press to fan open, slide to choose a drink, hold to adjust the amount • Track water, coffee, tea, milk, juice, soda, and more • Home Screen widget that shows your painting progress and lets you add water with one tap • Gallery to browse and choose your daily painting • Data Room to review today's intake with category filters and swipe-to-delete • Customizable daily goal and quick-add slots • Gentle encouragement messages and ukiyo-e trivia throughout the day • Haptic feedback • Localized in English, Chinese and Japanese • No account required. All data stays on your device.
Intermittent
This app tracks your fasting progress by showing real-time biological phases like ketosis and autophagy. It provides science-backed explanations for each stage and supports various fasting protocols without requiring an account or subscription.
- Real-time biological phase tracking (Fed, Lipolysis, Ketosis, Autophagy)
- Support for multiple fasting protocols (12:12 to 72-hour fasts)
- Free science library with cited primary sources
- Adaptive hydration target
- Weight and progress tracking with trend analysis
- Private sharing circle with applause-only responses
- Home screen widget and cross-device sync
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The intermittent fasting tracker that shows the biology happening inside you in real time: Fed, Lipolysis, Ketosis, Autophagy. Ad free fasting app. No account required. Most fasting apps give you a countdown clock and a streak to protect. Intermittent does something different. It shows you exactly which biological phase your body is in right now, and explains the science behind it with cited primary sources, not marketing copy. If you have ever wondered how to track fasting properly, or what is actually happening during a fast, this is the fasting tracker built for that question. WHY FASTING WORKS Intermittent fasting works because of what happens between meals, not just the absence of food. As your fast progresses, your body moves through distinct phases: burning through glucose reserves, shifting into fat burning lipolysis, entering ketosis, and eventually triggering autophagy, the cellular repair process linked to longevity and metabolic health. Understanding these transitions is what separates intentional fasting from guesswork. Intermittent maps every stage so your goals are grounded in biology, not motivation. KEY FEATURES PHASE AWARE FASTING TIMER A real time timer that tracks six biological phases: Fed, Early Fasting, Lipolysis, Ketosis, Autophagy, and Deep Fast. Each phase links to a free science article with primary sources cited. EVERY FASTING PROTOCOL, ONE APP Supports 12:12, 14:10, 16:8, 18:6, 20:4, OMAD (One Meal A Day), 36 hour, 48 hour, and 72 hour fasts. FREE FASTING SCIENCE LIBRARY A full library of fasting articles covering intermittent fasting, ketosis, autophagy, insulin response, and more. No subscription. No account. No paywall. SMART HYDRATION TARGET A science backed hydration goal that adapts to your weight, sex, age, and fasting duration. WEIGHT AND PROGRESS TRACKING Log your weight after each fast and track trends over time. Includes streak heatmap, phase reach history, and estimated fat vs glucose energy usage. PRIVATE CIRCLE AND END OF FAST REFLECTION Share your fast with a small private group. Applause only responses. No comparison. No gamification. HOME SCREEN WIDGET AND CROSS DEVICE SYNC Keep your fasting timer visible with a home screen widget. Your data syncs across devices privately without third party trackers. WHO IT IS FOR Intermittent is built for adults who want to understand fasting, not be coached through it. If you follow research on metabolic health, read about longevity, or want a fasting routine grounded in biology rather than points or streaks, this app is for you. Suitable for both beginners and experienced fasters. HOW IT WORKS Choose your fasting protocol, from 12:12 to extended fasts Start your timer and track your biological phase in real time Tap any phase to read the science and log your reflection at the end No account required to start. No subscription required to access the library.
Screenshots
Verdict
The clearest difference is device support: Intermittent at 3 against Hydro Paint's 1. Intermittent also leads on iOS requirement (13.0 vs 17.6). On price, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | Hydro Paint | Intermittent |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (48 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 48 — better |
| Update frequency | — | Every 10 days |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 13.0 — better |
| Further details — not scored | ||
| Size | 38 MB | 39 MB |
| Age rating | 4+ | 17+ |
| Developer | RUNXI DENG | Rohit Kumar |
In-app purchases
Hydro Paint
No in-app purchases
Intermittent
No in-app purchases









