# Science 8 vs Double Displacement Reaction

The clearest difference is price: Science 8 at Free against Double Displacement Reaction's $1.99. Science 8 also leads on update cadence (every 3 months vs every 33 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Science 8 is free to download; Double Displacement Reaction costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Science 8 ships an update every 3 months, Double Displacement Reaction every 33 months. The most recent releases landed on November 2, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Science 8 | Double Displacement Reaction |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/science-8/id1082583626/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 33 months |
| Monetization | Free | — |
| Size | 32 MB | 152 MB |
| Requires iOS | 11.0 | 11.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [IdeateGames](https://appshunter.io/developer/446654404) | [VIRTUAL FILAMENTS PRIVATE LIMITED](https://appshunter.io/developer/1474217212) |

## What reviewers say

### Science 8

[App page](https://appshunter.io/ios/app/science-8/id1082583626)

This app offers interactive tools and practice tests to help middle school students visualize and understand key science concepts. It includes simulations for density, molecular activity, and population dynamics, along with practice tests covering various science subjects.

**Highlights:** Interactive molecular activity demonstration, Density and buoyancy simulation, Comprehensive science practice tests, Category building exercises, Statistics exploration tool, Food web population dynamics simulation

**Features:** macOS Compatibility

**In-app purchases:** none


### Double Displacement Reaction

[App page](https://appshunter.io/ios/app/double-displacement-reaction/id1545135470)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Science 8 free?

Science 8 is free to download, with no in-app purchases.

### Is Double Displacement Reaction free?

Double Displacement Reaction costs $1.99, with no in-app purchases.

### Do Science 8 or Double Displacement Reaction have ads?

Neither Science 8 nor Double Displacement Reaction shows ads.

### Which is updated more often, Science 8 or Double Displacement Reaction?

Science 8 ships an update every 3 months, and Double Displacement Reaction every 33 months. Most recently, Science 8 was updated on November 2, 2026 and Double Displacement Reaction on October 27, 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.*