FastZen vs Hydratica.
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FastZen
This app helps you manage your fasting schedule with customizable timers and reminders. It offers a recurring weekly routine, a timer that remembers your progress, and a clear view of your active fast. Review your history and track your streaks, all while keeping your data private on your device.
- Customizable fasting schedules
- Recurring weekly routine setup
- Live Activities for active fast tracking
- Detailed fasting history and streaks
- No account, ads, or server sync
- Custom Week one-time purchase
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Follow your current fast and organize a week that fits your routine. Start or end your timer, adjust times and review your history. Rest days belong in your schedule: the plan should fit your life, not the other way around. The core timer is free. Custom Week is available as a one-time purchase, without a subscription. People who used FastZen before version 1.1.0 keep that access without paying. This is a tracking tool, not medical advice or a weight-loss promise.
Hydratica.
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Tap the glass on your Lock Screen. Watch the it fill. Back to your day. Hydratica is a water tracker you never have to open. No launch, no loading, no typing numbers. One tap from the Lock Screen and it is logged. Most hydration apps fail because logging water takes more effort than drinking it. Hydratica removes every step but one. WHAT YOU GET - Lock Screen Glass widget — log without opening the app - Full-screen fill animation for when you do open it - Custom daily goal - Intake calendar with streak count - Unlimited reminders - Six color themes and matching app icons (only one is blue) - Fully offline — your data never leaves your device (each device keeps its own log) - No account, no ads, no sign-up HOW IT WORKS Hydratica is free to download and includes a free trial of everything above. When the trial ends, a single one-time purchase unlocks the app permanently. No subscription, ever. Buy once and it is yours forever. One tap. One glance. Done.
Screenshots
Verdict
The clearest difference is in-app purchases: Hydratica. at none against FastZen's 3. On price, update cadence, 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. FastZen sells 3 one-off in-app purchases. Hydratica. asks for nothing beyond the download.
FastZen ships an update weekly, Hydratica. every 10 days. The most recent releases landed on October 7, 2026 and October 2, 2026 respectively.
| Parameter | FastZen | Hydratica. |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| Update frequency | Weekly — better | Every 10 days |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.0 | 17.0 |
| Further details — not scored | ||
| Size | 2 MB | 65 MB |
| Age rating | 4+ | 4+ |
| Developer | Benjamin Dupin | The Perfect Brands Stockholm AB |
In-app purchases
FastZen
- Coffee$0.99
- Thanks$2.99
- Support development$4.99
Hydratica.
No in-app purchases
