# Bilateral! vs 21 Letters

The clearest difference is in-app purchases: Bilateral! at none against 21 Letters's 6. Bilateral! also leads on ads (none vs shown) and rating (5.0 vs 4.7). 21 Letters's advantage is device support (3 vs 1) and iOS requirement (12.0 vs 17.2). On price and ratings volume there is nothing between them.

Both are free to download. 21 Letters sells 6 one-off in-app purchases. Bilateral! asks for nothing beyond the download.

Bilateral! holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 23 and 64 respectively. Written reviews point the same way: 100% of Bilateral!'s written reviews are positive against 82% of 21 Letters's.

Bilateral! ships an update daily, 21 Letters every 2 days. The most recent releases landed on June 4, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | Bilateral! | 21 Letters |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (23 ratings)](https://appshunter.io/ios/app/bilateral/id6475633202/reviews)** | [4.7 (64 ratings)](https://appshunter.io/ios/app/21-letters/id6504524436/reviews) |
| Number of ratings | 23 | **64** |
| Positive reviews | **100.0% of reviews** | 81.8% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Daily** | Every 2 days |
| Monetization | **Free** | Free with in-app purchases |
| Size | 33 MB | 106 MB |
| Requires iOS | 17.2 | **12.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Alec Rogers](https://appshunter.io/developer/1724568802) | [Shallot Games, LLC.](https://appshunter.io/developer/916624104) |

## What reviewers say

### Bilateral!

[App page](https://appshunter.io/ios/app/bilateral/id6475633202)

Engage in a quick daily word puzzle with a new challenge each day. Share your progress and results easily with friends and family. This game is completely free, with no ads, accounts, or logins required.

**Highlights:** Daily new word puzzle, Quick gameplay, Shareable results, No ads, No accounts or logins

**In-app purchases:** none


### 21 Letters

[App page](https://appshunter.io/ios/app/21-letters/id6504524436)

A daily word game where you build connecting words to achieve a high score. Compete with friends and family using the same daily set of letters. The game ends when you run out of letters or can no longer form words.

**Highlights:** Daily word challenges, Connecting word building, High score tracking, Friend and family competition, Unique daily letter sets

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| August 2024 Ad-Free | $2.99 | one-time |
| September 2024 Ad-Free | $2.99 | one-time |
| October 2024 Ad-Free | $2.99 | one-time |
| May 2024 Ad-Free | $2.99 | one-time |
| June 2024 Ad-Free | $2.99 | one-time |
| July 2024 Ad-Free | $2.99 | one-time |


## Frequently asked questions

### Is Bilateral! free?

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

### Is 21 Letters free?

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

### Which has better reviews, Bilateral! or 21 Letters?

Bilateral! is rated higher. Bilateral! averages 5.0 out of 5 from 23 ratings, while 21 Letters averages 4.7 from 64 ratings.

### Do Bilateral! or 21 Letters have ads?

21 Letters shows ads; Bilateral! does not.

### Which is updated more often, Bilateral! or 21 Letters?

Bilateral! ships an update daily, and 21 Letters every 2 days. Most recently, Bilateral! was updated on June 4, 2026 and 21 Letters on September 15, 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.*