# Memory Nature Explorer vs 21 Saga

The clearest difference is ads: Memory Nature Explorer at none against 21 Saga's shown. Memory Nature Explorer also leads on monetization model (free vs ad-supported). 21 Saga's advantage is update cadence (weekly vs monthly). On price, rating, ratings volume and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for Memory Nature Explorer against 5.0 for 21 Saga. Both are backed by a comparable volume of ratings — 2 and 4 respectively.

Memory Nature Explorer ships an update monthly, 21 Saga weekly. Both last shipped on October 24, 2026.

## The numbers

| Metric | Memory Nature Explorer | 21 Saga |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/memory-nature-explorer/id6748313804/reviews) | [5.0 (4 ratings)](https://appshunter.io/ios/app/21-saga/id6751415168/reviews) |
| Number of ratings | 2 | **4** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Monthly | **Weekly** |
| Monetization | **Free** | Ad-supported |
| Size | 39 MB | 174 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 17+ | 12+ |
| Developer | [SOUTHWEST WISCONSIN WORKFORCE DEVELOPMENT BOARD, INC.](https://appshunter.io/developer/1824169447) | [XCELLENT CONTENT MEDIA GROUP CORPORATION](https://appshunter.io/developer/1717203222) |

## What reviewers say

### Memory Nature Explorer

[App page](https://appshunter.io/ios/app/memory-nature-explorer/id6748313804)

Engage your memory with a direction-based matching game. Test your ability to recall sequences and identify patterns in various challenges. Suitable for players looking to sharpen their cognitive skills.

**Highlights:** Direction Count game, Number identification game, Direction identification game, Memory matching challenges, Cognitive skill enhancement

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

**In-app purchases:** none


### 21 Saga

[App page](https://appshunter.io/ios/app/21-saga/id6751415168)

A relaxing card game that combines classic solitaire mechanics with gentle brain training. Easily combine cards to reach 21, improving memory, reaction, and math skills without timers or complex rules. Enjoy a clean interface and progress through levels at your own pace, anytime, anywhere.

**Highlights:** Simple rules, learn in 1 minute, Oversized text and clean interface, Trains memory, reaction, and math skills, Gradual difficulty progression, Offline play, no Wi-Fi needed, No timers or rush

**In-app purchases:** none


## Frequently asked questions

### Is Memory Nature Explorer free?

Memory Nature Explorer is free to download, with no in-app purchases.

### Is 21 Saga free?

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

### Which has better reviews, Memory Nature Explorer or 21 Saga?

Memory Nature Explorer and 21 Saga are both rated 5.0 out of 5 on the App Store, from 2 and 4 ratings respectively.

### Do Memory Nature Explorer or 21 Saga have ads?

21 Saga shows ads; Memory Nature Explorer does not.

### Which is updated more often, Memory Nature Explorer or 21 Saga?

Memory Nature Explorer ships an update monthly, and 21 Saga weekly. Most recently, Memory Nature Explorer was updated on October 24, 2026 and 21 Saga on October 24, 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.*