# Square Panda Letter Lullaby vs Osmo Coding Duo

The clearest difference is review sentiment: Osmo Coding Duo at 53% against Square Panda Letter Lullaby's 0%. Osmo Coding Duo also leads on rating (3.9 vs 3.2) and ratings volume (145 vs 10). Square Panda Letter Lullaby's advantage is monetization model (free vs free with in-app purchases) and iOS requirement (8.0 vs 15.0). On price, update cadence, ads 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.

Osmo Coding Duo holds the better App Store score, 3.9 against 3.2. That said, the two scores are not equally well evidenced: Osmo Coding Duo has 145 ratings behind it against 10, so its average is the more settled of the two. Written reviews point the same way: 0% of Square Panda Letter Lullaby's written reviews are positive against 53% of Osmo Coding Duo's.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 2, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Square Panda Letter Lullaby | Osmo Coding Duo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.2 (10 ratings)](https://appshunter.io/ios/app/square-panda-letter-lullaby/id1157733021/reviews) | **[3.9 (145 ratings)](https://appshunter.io/ios/app/osmo-coding-duo/id1294444077/reviews)** |
| Number of ratings | 10 | **145** |
| Positive reviews | 0.0% of reviews | **52.6% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 263 MB | 309 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Square Panda Inc.](https://appshunter.io/developer/1088414097) | [Tangible Play](https://appshunter.io/developer/799157444) |

## What reviewers say

### Square Panda Letter Lullaby

[App page](https://appshunter.io/ios/app/square-panda-letter-lullaby/id1157733021)

Children create their own alphabet songs by arranging letters, experiencing tactile reinforcement and multi-sensory engagement. This app offers two modes: one for song creation and another for reviewing new words learned, bringing their unique lullabies to life.

**Highlights:** Customizable alphabet songs, Tactile letter reinforcement, Multi-sensory learning, Word review mode, Phonics and vocabulary building, Contextual word reinforcement with pictures

**Features:** macOS Compatibility

**In-app purchases:** none


### Osmo Coding Duo

[App page](https://appshunter.io/ios/app/osmo-coding-duo/id1294444077)

This app offers a collaborative coding adventure where two players team up to solve logic puzzles and rescue pets. It introduces real-world coding concepts through engaging challenges and a fun narrative.

**Highlights:** Multistep logic problems, Collaborative play for two, Coding concept introduction, Pet rescue adventure, Osmo character interaction

**In-app purchases:** none


## Frequently asked questions

### Is Square Panda Letter Lullaby free?

Square Panda Letter Lullaby is free to download, with no in-app purchases.

### Is Osmo Coding Duo free?

Osmo Coding Duo is free to download, with no in-app purchases.

### Which has better reviews, Square Panda Letter Lullaby or Osmo Coding Duo?

Osmo Coding Duo is rated higher. Square Panda Letter Lullaby averages 3.2 out of 5 from 10 ratings, while Osmo Coding Duo averages 3.9 from 145 ratings.

### Do Square Panda Letter Lullaby or Osmo Coding Duo have ads?

Neither Square Panda Letter Lullaby nor Osmo Coding Duo shows ads.

### Which is updated more often, Square Panda Letter Lullaby or Osmo Coding Duo?

Square Panda Letter Lullaby ships an update every 2 months, and Osmo Coding Duo every 2 months. Most recently, Square Panda Letter Lullaby was updated on October 2, 2026 and Osmo Coding Duo on October 18, 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.*