# Duck Duck Moose Reading HD vs FLEX

The clearest difference is review sentiment: Duck Duck Moose Reading HD at 43% against FLEX's 0%. FLEX's advantage is device support (3 vs 1). 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.

Duck Duck Moose Reading HD ships an update every 11 months, FLEX every 19 months. The most recent releases landed on October 22, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Duck Duck Moose Reading HD | FLEX |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.1 (32 ratings)](https://appshunter.io/ios/app/duck-duck-moose-reading-hd/id573698255/reviews)** | — |
| Number of ratings | **32** | — |
| Positive reviews | **43.5% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 11 months** | Every 19 months |
| Monetization | Free | Free |
| Size | 55 MB | 7 MB |
| Requires iOS | **9.0** | 9.3 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Duck Duck Moose LLC](https://appshunter.io/developer/303076298) | [Leripa AB](https://appshunter.io/developer/454449587) |

## What reviewers say

### Duck Duck Moose Reading HD

[App page](https://appshunter.io/ios/app/duck-duck-moose-reading-hd/id573698255)

This app offers a zoo-themed adventure to teach phonics and reading skills to young children. It features word and letter activities aligned with Common Core State Standards, along with a parent reporting tool to track progress. Developed with educators, it's designed for ages 3-7.

**Highlights:** Zoo-themed learning adventure, Phonics and reading skill development, Word and letter activities, Common Core State Standards alignment, Parent progress reporting tool, Developed with educators

**In-app purchases:** none


### FLEX

[App page](https://appshunter.io/ios/app/flex-math-tools/id977115416)

This interactive educational tool helps teachers visualize basic math concepts like fractions and number lines. It allows for the creation of independent student projects and supplements math training programs. Enhance understanding of mathematical skills with various visual aids.

**Highlights:** Number lines visualization, Fraction tools, Number bonds, Number blocks, Create student projects, Mathematical symbols

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

**In-app purchases:** none


## Frequently asked questions

### Is Duck Duck Moose Reading HD free?

Duck Duck Moose Reading HD is free to download, with no in-app purchases.

### Is FLEX free?

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

### Do Duck Duck Moose Reading HD or FLEX have ads?

Neither Duck Duck Moose Reading HD nor FLEX shows ads.

### Which is updated more often, Duck Duck Moose Reading HD or FLEX?

Duck Duck Moose Reading HD ships an update every 11 months, and FLEX every 19 months. Most recently, Duck Duck Moose Reading HD was updated on October 22, 2026 and FLEX on October 29, 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.*