# CellWalk vs LetterPop

The clearest difference is price: CellWalk at Free against LetterPop's $0.99. CellWalk also leads on ratings volume (72 vs 2) and device support (4 vs 2). LetterPop's advantage is update cadence (every 2 days vs every 2 weeks) and review sentiment (100% vs 92%). On rating, ads and in-app purchases there is nothing between them.

CellWalk is free to download; LetterPop costs $0.99 up front. CellWalk sells 3 in-app purchases, starting at $9.99 per month and LetterPop sells 6 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.9 for CellWalk against 5.0 for LetterPop. That said, the two scores are not equally well evidenced: CellWalk has 72 ratings behind it against 2, so its average is the more settled of the two. Written reviews are what separate them: 92% of CellWalk's written reviews are positive against 100% of LetterPop's.

CellWalk ships an update every 2 weeks, LetterPop every 2 days. The most recent releases landed on October 30, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | CellWalk | LetterPop |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | [4.9 (72 ratings)](https://appshunter.io/ios/app/cellwalk/id1627776848/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/letterpop/id6755658238/reviews)** |
| Number of ratings | **72** | 2 |
| Positive reviews | 91.7% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 2 days** |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 555 MB | 20 MB |
| Requires iOS | 27.0 | **18.6** |
| Devices | **iPhone, iPad, Mac, Vision Pro** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Ako Biotica Inc.](https://appshunter.io/developer/1895703608) | [Polina Viktoriia Pavletenko](https://appshunter.io/developer/1855323609) |

## What reviewers say

### CellWalk

[App page](https://appshunter.io/ios/app/cellwalk/id1627776848)

Explore the intricate world of cells in a 3D environment, from the overall structure down to molecular details. Tap on terms to receive clear, contextual explanations powered by on-device AI, adapting to your learning level. Designed for students and educators to foster a deeper understanding of cell biology.

**Highlights:** 3D cell exploration, On-device AI definitions, Multi-level explanations, Interactive concept chains, Touch-first navigation, High-fidelity visuals

**Features:** iPhone Duo support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CellWalk Pro Monthly | $9.99 | per month |
| CellWalk Pro Annual | $79.99 | per year |
| Pro Lessons | $39.99 | one-time |

**What reviewers like**

- ✨ Stunning visualizations
- 🔬 Incredible detail
- 🧠 Informative content
- 👍 Easy to use
- 🚀 Smooth performance

**What reviewers complain about**

- ⚠️ Misleading information
- 📚 Limited content
- 🖼️ Tiny window view
- 😵 Nauseating renderer
- 🐛 Buggy performance

**Reported bugs**

- ATP synthase described backwards
- Renderer noise causes nausea
- Buggy and low framerate
- Renderer not responsive to head movements

**Requested features**

- More cells to explore (eukaryotic, mammalian, computer cells)
- More content and depth
- Expand on descriptions with an 'expand on' feature
- Add tutorials for new users
- Add color to highlighted text for easy reference


### LetterPop

[App page](https://appshunter.io/ios/app/letterpop/id6755658238)

A word game where you tap colorful letter balls to spell words and earn points. Supports multiple languages and custom word lists, offering an engaging way to practice vocabulary. Enjoy a pure, ad-free experience with no subscriptions.

**Highlights:** Tap letter balls to spell words, Adjustable word length (3-7 letters), 11 languages supported, Custom word list editor, Text-to-speech pronunciation, Works on iPhone and iPad

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Good support | $0.99 | one-time |
| Good Support + | $0.99 | one-time |
| Great Support | $1.99 | one-time |
| Great Support + | $1.99 | one-time |
| Excellent Support + | $4.99 | one-time |
| Excellent Support | $4.99 | one-time |


## Frequently asked questions

### Is CellWalk free?

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

### Is LetterPop free?

LetterPop costs $0.99, and also offers in-app purchases.

### Which has better reviews, CellWalk or LetterPop?

LetterPop is rated higher. CellWalk averages 4.9 out of 5 from 72 ratings, while LetterPop averages 5.0 from 2 ratings.

### Do CellWalk or LetterPop have ads?

Neither CellWalk nor LetterPop shows ads.

### Which is updated more often, CellWalk or LetterPop?

CellWalk ships an update every 2 weeks, and LetterPop every 2 days. Most recently, CellWalk was updated on October 30, 2026 and LetterPop 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.*