# Eterna vs Letter Lattice

The clearest difference is review sentiment: Letter Lattice at 96% against Eterna's 33%. Letter Lattice also leads on rating (4.9 vs 3.7) and ratings volume (565 vs 15). Eterna's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Letter Lattice sells 1 one-off in-app purchase. Eterna asks for nothing beyond the download.

Letter Lattice holds the better App Store score, 4.9 against 3.7. That said, the two scores are not equally well evidenced: Letter Lattice has 565 ratings behind it against 15, so its average is the more settled of the two. Written reviews point the same way: 33% of Eterna's written reviews are positive against 96% of Letter Lattice's.

Eterna ships an update every 3 weeks, Letter Lattice every 3 months. The most recent releases landed on November 3, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | Eterna | Letter Lattice |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (15 ratings)](https://appshunter.io/ios/app/eterna/id1513216417/reviews) | **[4.9 (565 ratings)](https://appshunter.io/ios/app/letter-lattice/id1535393944/reviews)** |
| Number of ratings | 15 | **565** |
| Positive reviews | 33.3% of reviews | **95.7% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 188 MB | 136 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Vital Mind Media](https://appshunter.io/developer/1513216416) | [Ethan Zarov](https://appshunter.io/developer/1519488445) |

## What reviewers say

### Eterna

[App page](https://appshunter.io/ios/app/eterna/id1513216417)

Engage in a citizen science game to design RNA molecules for medical research. Solve puzzles to unlock lab access and contribute to inventing new medicines through challenges.

**Highlights:** Design RNA molecules, Solve scientific puzzles, Participate in medical research, Invent new medicines, Unlock lab access

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

**In-app purchases:** none


### Letter Lattice

[App page](https://appshunter.io/ios/app/letter-lattice/id1535393944)

This word puzzle game blends anagrams and crosswords, challenging players to connect words by finding anagrams. It offers hundreds of handcrafted puzzles, daily challenges, and an arcade mode for competitive play. Unlock achievements and customize your game with vibrant color palettes.

**Highlights:** Anagram and crossword word-weaving puzzles, Hundreds of handcrafted puzzles, Daily new puzzles, Arcade Mode with procedural puzzles, Achievements and progress tracking, Unlockable color palettes

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Full Game | $2.99 | one-time |

**What reviewers like**

- 🚀 Great game
- 👍 Unique and fun gameplay
- 👍 Aesthetically pleasing design
- 👍 Excellent tutorial
- 👍 Generous free content

**What reviewers complain about**

- 🐛 Daily game not working for some
- 🕰️ Timer counts ad time
- 🤔 Confusing gameplay mechanics for some

**Reported bugs**

- Daily game not working
- Calendar trick to play daily no longer working

**Requested features**

- Word definitions for solved words
- More game packs and difficulty levels
- Landscape mode support
- External keyboard support


## Frequently asked questions

### Is Eterna free?

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

### Is Letter Lattice free?

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

### Which has better reviews, Eterna or Letter Lattice?

Letter Lattice is rated higher. Eterna averages 3.7 out of 5 from 15 ratings, while Letter Lattice averages 4.9 from 565 ratings.

### Do Eterna or Letter Lattice have ads?

Letter Lattice shows ads; Eterna does not.

### Which is updated more often, Eterna or Letter Lattice?

Eterna ships an update every 3 weeks, and Letter Lattice every 3 months. Most recently, Eterna was updated on November 3, 2026 and Letter Lattice on November 7, 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.*