# LetterGrid vs SumX

The clearest difference is in-app purchases: SumX at none against LetterGrid's 1. SumX also leads on update cadence (every 5 days vs every 2 weeks). LetterGrid's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. LetterGrid sells 1 in-app purchase, starting at $0.99 per month. SumX asks for nothing beyond the download.

LetterGrid ships an update every 2 weeks, SumX every 5 days. The most recent releases landed on October 30, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | LetterGrid | SumX |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/lettergrid/id6755408578/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 2 weeks | **Every 5 days** |
| Monetization | Free with in-app purchases | — |
| Size | 368 MB | 41 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [Bradford Foley](https://appshunter.io/developer/1147703791) | [SumX Games LTD.](https://appshunter.io/developer/1872948245) |

## What reviewers say

### LetterGrid

[App page](https://appshunter.io/ios/app/lettergrid/id6755408578)

A daily word puzzle game where players slide rows and columns on a 4x4 grid to form words. Each day presents a new challenge with a limited number of moves to maximize your score and maintain your streak.

**Highlights:** Daily sliding word puzzles, 4x4 grid gameplay, Limited move challenges, Score building and streaks, Simple to learn, strategic to master

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Subscription | $0.99 | per month |


### SumX

[App page](https://appshunter.io/ios/app/sumx-daily-math-brain-puzzle/id6758439413)

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

**In-app purchases:** none


## Frequently asked questions

### Is LetterGrid free?

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

### Is SumX free?

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

### Do LetterGrid or SumX have ads?

SumX shows ads; LetterGrid does not.

### Which is updated more often, LetterGrid or SumX?

LetterGrid ships an update every 2 weeks, and SumX every 5 days. Most recently, LetterGrid was updated on October 30, 2026 and SumX on November 5, 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.*