# Ecological Pyramid vs Direct Variation

The clearest difference is price: Direct Variation at Free against Ecological Pyramid's $0.99. Direct Variation also leads on device support (3 vs 1). On ads, in-app purchases and iOS requirement there is nothing between them.

Direct Variation is free to download; Ecological Pyramid costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Ecological Pyramid | Direct Variation |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[2.0 (1 ratings)](https://appshunter.io/ios/app/ecological-pyramid/id1002379515/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | — |
| Monetization | Paid | — |
| Size | 76 MB | 66 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [www.ajaxmediatech.com](https://appshunter.io/developer/973768003) | [Science Education Institute](https://appshunter.io/developer/1439710468) |

## What reviewers say

### Ecological Pyramid

[App page](https://appshunter.io/ios/app/ecological-pyramid/id1002379515)

This app uses animation to teach children about Earth's ecosystems, food chains, and the hierarchy of life. It offers interactive elements to test understanding of ecological pyramids and food chain processes.

**Highlights:** Animated food chain explanations, Detailed theory on ecological pyramids, Interactive ecosystem exploration, Food chain hierarchy assessment, K12 adaptive learning model

**Features:** macOS Compatibility

**In-app purchases:** none


### Direct Variation

[App page](https://appshunter.io/ios/app/direct-variation/id6742366239)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Ecological Pyramid free?

Ecological Pyramid costs $0.99, with no in-app purchases.

### Is Direct Variation free?

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

### Do Ecological Pyramid or Direct Variation have ads?

Neither Ecological Pyramid nor Direct Variation shows ads.

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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.*