# Wasser vs Birthify Calendar

The clearest difference is in-app purchases: Birthify Calendar at none against Wasser's 1. Birthify Calendar also leads on ads (none vs shown) and update cadence (fortnightly vs every 7 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Wasser sells 1 in-app purchase, starting at $3.99 per month. Birthify Calendar asks for nothing beyond the download.

Wasser ships an update every 7 months, Birthify Calendar fortnightly. The most recent releases landed on November 5, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Wasser | Birthify Calendar |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 7 months | **Fortnightly** |
| Size | 40 MB | 37 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Robin Kaulfuss](https://appshunter.io/developer/1880342485) | [Marten Messiha](https://appshunter.io/developer/1896598535) |

## What reviewers say

### Wasser

[App page](https://appshunter.io/ios/app/wasser-challenge/id6759720544)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $3.99 | per month |


### Birthify Calendar

[App page](https://appshunter.io/ios/app/birthify-calendar/id6768742093)

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

**In-app purchases:** none


## Frequently asked questions

### Is Wasser free?

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

### Is Birthify Calendar free?

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

### Do Wasser or Birthify Calendar have ads?

Wasser shows ads; Birthify Calendar does not.

### Which is updated more often, Wasser or Birthify Calendar?

Wasser ships an update every 7 months, and Birthify Calendar fortnightly. Most recently, Wasser was updated on November 5, 2026 and Birthify Calendar on October 10, 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.*