# Hydrate vs Fastum

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.

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.

## The numbers

| Metric | Hydrate | Fastum |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (14 ratings)](https://appshunter.io/ios/app/fastum-fasting-timer-and-stages/id6787239004/reviews)** |
| Number of ratings | — | **14** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 6 days** | Weekly |
| Monetization | — | Free with in-app purchases |
| Size | 22 MB | 57 MB |
| Requires iOS | 18.0 | **16.4** |
| Devices | **iPhone, Apple Watch** | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [ALEXANDER DAVID GRUINARD MACKENZIE](https://appshunter.io/developer/1886580061) | [Yurii Moskviak](https://appshunter.io/developer/6787239006) |

## What reviewers say

### Hydrate

[App page](https://appshunter.io/ios/app/hydrate-electrolyte-tracker/id6760869789)

**Features:** Apple Watch app

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hydrate Pro — Monthly | $3.99 | per month |
| Hydrate Pro — Annual | $24.99 | per year |
| Lifetime Pro | $34.99 | one-time |


### Fastum

[App page](https://appshunter.io/ios/app/fastum-fasting-timer-and-stages/id6787239004)

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.

**Highlights:** 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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Fastum Pro Monthly | $7.99 | per month |
| Fastum Pro Annual | $49.99 | per year |


## Frequently asked questions

### Is Hydrate free?

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

### Is Fastum free?

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

### Do Hydrate or Fastum have ads?

Fastum shows ads; Hydrate does not.

### Which is updated more often, Hydrate or Fastum?

Hydrate ships an update every 6 days, and Fastum weekly. Most recently, Hydrate was updated on October 7, 2026 and Fastum on October 22, 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.*