# Short Term Memory vs WaterCal

The clearest difference is price: Short Term Memory at Free against WaterCal's $0.99. Short Term Memory also leads on iOS requirement (15.0 vs 18.6). WaterCal's advantage is in-app purchases (none vs 1) and ads (none vs shown). On update cadence and device support there is nothing between them.

Short Term Memory is free to download; WaterCal costs $0.99 up front. Short Term Memory sells 1 in-app purchase, starting at $0.99 per month. WaterCal asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on October 20, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Short Term Memory | WaterCal |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[4.4 (1.1K ratings)](https://appshunter.io/ios/app/short-term-memory/id804088277/reviews)** | — |
| Number of ratings | **1.1K** | — |
| Positive reviews | 70.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | Every 4 months |
| Monetization | Ad-supported | — |
| Size | 164 MB | 9 MB |
| Requires iOS | **15.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [ferrety inc.](https://appshunter.io/developer/804088280) | [Nicely Dressed Code](https://appshunter.io/developer/1559095502) |

## What reviewers say

### Short Term Memory

[App page](https://appshunter.io/ios/app/short-term-memory/id804088277)

This app offers a straightforward memory training game designed to help users maintain and improve their cognitive abilities. It features levels that increase in difficulty, challenging players to memorize an expanding number of cute illustrations. It's ideal for intellectual training and potentially preventing cognitive decline.

**Highlights:** Memory improvement exercises, Intellectual training, Dementia prevention focus, Cute illustration memorization, Progressive difficulty levels, Up to 20 illustrations to memorize

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Plan | $0.99 | per month |

**What reviewers like**

- 🤓 Enhanced memory practice
- 👍 Simple and fun gameplay
- 💡 Potential for more content (illustrations, levels, ad-free)

**What reviewers complain about**

- 🐛 Spontaneous ads that break concentration
- 🤯 Counterintuitive controls (bashing screen)
- 🤔 Limited customization options (words vs. pictures)

**Reported bugs**

- Images from previous screen not appearing in find screen
- Timer issues
- Scrolling problems causing accidental taps

**Requested features**

- More customization options
- Ad-free paid version
- Improved graphics


### WaterCal

[App page](https://appshunter.io/ios/app/watercal/id1559095500)

**Features:** Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Short Term Memory free?

Short Term Memory is free to download, with in-app purchases available.

### Is WaterCal free?

WaterCal costs $0.99, with no in-app purchases.

### Do Short Term Memory or WaterCal have ads?

Short Term Memory shows ads; WaterCal does not.

### Which is updated more often, Short Term Memory or WaterCal?

Short Term Memory ships an update every 4 months, and WaterCal every 4 months. Most recently, Short Term Memory was updated on October 20, 2026 and WaterCal on October 12, 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.*