# FastZen vs Hydratica.

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.

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.

## The numbers

| Metric | FastZen | Hydratica. |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Every 10 days |
| Monetization | Free with in-app purchases | — |
| Size | 2 MB | 65 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Benjamin Dupin](https://appshunter.io/developer/1871474236) | [The Perfect Brands Stockholm AB](https://appshunter.io/developer/1888481973) |

## What reviewers say

### FastZen

[App page](https://appshunter.io/ios/app/fastzen-fasting-timer/id6761484595)

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.

**Highlights:** 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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Coffee | $0.99 | one-time |
| Thanks | $2.99 | one-time |
| Support development | $4.99 | one-time |


### Hydratica.

[App page](https://appshunter.io/ios/app/hydratica/id6775402035)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is FastZen free?

FastZen is free to download, with in-app purchases available.

### Is Hydratica. free?

Hydratica. is free to download, with no in-app purchases.

### Do FastZen or Hydratica. have ads?

Neither FastZen nor Hydratica. shows ads.

### Which is updated more often, FastZen or Hydratica.?

FastZen ships an update weekly, and Hydratica. every 10 days. Most recently, FastZen was updated on October 7, 2026 and Hydratica. on October 2, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*