Hydrate vs Fastum
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Hydrate
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The electrolyte and water tracker for real days — long shifts, workouts, keto and fasting. Log water, salt mixes and coffee in one tap on iPhone or Apple Watch, and see fluid, sodium and caffeine together. No account. No guilt. Reminders that stay quiet when you're already on track. LOG WATER, ELECTROLYTES, COFFEE & MORE • Choose from 40+ drinks, custom recipes, and saved favorites • See goal credit before you confirm every log • Track fluid, sodium, and caffeine in one clear daily picture • Edit history or undo mistakes without losing the original day KNOW YOUR PACE • Set your own daily goal and waking schedule • See where your progress should be right now—not just a midnight total • Use pace-aware reminders that can stay quiet when you are already on track • Choose intervals, active hours, quiet time, and rotating or night-shift schedules FAST ON EVERY APPLE SURFACE • Log from Apple Watch, Home Screen and Lock Screen widgets, Siri, complications, Control Center, or the Action Button • Keep favorite drink-and-size combinations ready for one-tap logging • See consistent units, goal credit, and daily progress across surfaces PRIVATE SIPSCAN • Point your camera at a drink for an on-device category suggestion • Get a typical amount or one learned from your confirmed habits • Nothing is uploaded, the photo is not stored, and you always confirm before logging ELECTROLYTES & APPLE HEALTH Hydrate tracks sodium from the drinks you log. Potassium and magnesium aren't tracked yet. • Log electrolyte mixes, salt water, bone broth, and custom drinks • See sodium from logged drinks in mg beside fluid and caffeine totals • Optionally sync confirmed water and sodium entries to Apple Health PROGRESS WITHOUT PRESSURE • Review seven-day patterns, goal days, timing, and recent drinks • Correct past entries and keep a clear, dependable history • Try guided routines for mornings, focused work, travel, and warm days PRIVATE BY DESIGN • No account or sign-up • No advertising IDs and no ad tracking • Hydration history stays on your device • Optional anonymous diagnostics are off by default DAILY LOGGING STAYS FREE Hydrate Pro is optional. It adds longer progress history, weekly reflection reports, guided routines, and data export. Hydrate Pro is optional and available as a monthly or annual auto-renewing subscription, or as a one-time Lifetime purchase. Eligible new annual subscribers can start with a 14-day free trial. Payment is charged to your Apple Account at confirmation. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period and can be managed in App Store account settings. Terms of Use: https://alexmackenzievancouver.github.io/hydrate-support/terms.html Privacy Policy: https://alexmackenzievancouver.github.io/hydrate-support/privacy.html
Fastum
This app helps users track their intermittent fasting journey with a simple, intuitive interface. It monitors your fast, logs meals and water intake, and provides insights into your body's metabolic stages. Integrates with health platforms for a comprehensive overview.
- One-tap fasting start
- Timed and open fast modes
- Metabolic stage notifications
- Water and weight tracking
- Meal and macro logging
- Apple Health integration
- Home screen widget
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Fastum is a fasting tracker for people who already know why they're fasting. Simple, straight to the point, and quietly beautiful. Choose your fast, start it in one tap, and let it run — while Fastum keeps the time, tracks your meals and water, and shows you exactly what your body is doing along the way. WHY PEOPLE CHOOSE FASTUM • No sign-up to begin. Answer a few questions, or skip them entirely and start fasting straight away. Create a free account when you want your history backed up — or when you start logging water, weight and meals, which is what it's for. • Start in one tap. Open Fast counts up with no goal. Timed Fast counts down to a length you choose, with presets like 16:8 — or any number of hours you want. • See what your body is actually doing. Settling, fat-burning, ketosis, autophagy — each stage arrives with a quiet notification, even when the app is closed. • Know when you'll eat. An hour before your window opens, Fastum tells you the actual time — so you can plan a meal around it, not watch a countdown. • Never lose your place. Your fast keeps running in the background, sits on your lock screen, and follows your account to a new phone. • Fix the start time. Began at 4pm and only opened the app at 6? Move the start time instead of restarting the fast. • Stopped by mistake? Resume it. The fast comes back exactly where it was, and the accidental entry disappears from your history. • Apple Health, both ways. Fastum reads your weight, sleep, heart rate and activity, and writes back the weight and water you log. • Light and dark, and genuinely nice to look at. FREE, FOR AS LONG AS YOU LIKE Open Fast and Timed Fast with presets. Every stage through the first 24 hours, explained, with the body diagram. Food logging — search, barcode scan and macros. Water and weight. Your last 7 days of history. The whole Learn library. No ads, and no account needed to fast. GREAT FOR • Your first honest 16:8 • Pushing past 24 hours with something watching the clock for you • Getting back on track after a week that got away from you • Anyone who wants the data without the noise FASTUM PRO — THE DEPTH BEYOND A DAY • Every stage past 24 hours. The first day is free; Pro is the rest of the map, through deep autophagy, immune reset and beyond. • Pro Fast — extended fasts from 24 hours to a week, with stage-by-stage guidance and a proper refeeding plan for coming out of it. • Custom Fast — build a repeating sequence of fast and eating windows that fits your week, not someone else's template. • Nutrition trends, the streak calendar, share cards, your complete history — every fast you have ever logged — and a home-screen widget. START WITH A FREE WEEK Both plans begin with a 7-day free trial. Live in the full version for a week, then decide. If notifications are on we'll remind you before it ends. Fastum Pro is an auto-renewing subscription, monthly or yearly. $7.99/month or $49.99/year, each with the first 7 days free. Billed through your Apple Account, always — so you cancel it yourself in iPhone Settings, in your own time. We never see your card, and there is no web account to hunt down. Full terms: https://yuramos.github.io/fastum/terms.html BEFORE YOU START Fastum is a wellness tool, not medical advice. Fasting — especially beyond 24 hours — carries real risks. Please talk to your doctor first, particularly if you are pregnant or breastfeeding, take medication, or live with a health condition. Fasts longer than about a week belong under medical supervision, and Fastum does not present them as a goal. Questions, ideas, or something broken? Write to us: support@yuramoskviak.com
Screenshots
Verdict
The clearest difference is ads: Hydrate at none against Fastum's shown. Fastum's advantage is iOS requirement (16.4 vs 18.0). On price, update cadence, 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
Both are free to download. Hydrate sells 3 in-app purchases, starting at $3.99 per month and Fastum sells 2 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.
Hydrate ships an update every 6 days, Fastum weekly. The most recent releases landed on October 7, 2026 and October 22, 2026 respectively.
| Parameter | Hydrate | Fastum |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (14 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 14 — better |
| Update frequency | Every 6 days — better | Weekly |
| Ads | No — better | Yes |
| In-app purchases | Yes | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, Apple Watch — better | iPhone |
| Requires iOS | 18.0 | 16.4 — better |
| Further details — not scored | ||
| Size | 22 MB | 57 MB |
| Age rating | 4+ | 12+ |
| Developer | ALEXANDER DAVID GRUINARD MACKENZIE | Yurii Moskviak |
In-app purchases
Hydrate
- Hydrate Pro — Monthly3 Days trial$3.991 Month
- Hydrate Pro — Annual14 Days trial$24.991 Year
- Lifetime Pro$34.99
Fastum
- Fastum Pro Monthly7 Days trial$7.991 Month
- Fastum Pro Annual7 Days trial$49.991 Year









