# Explain 3D FREE vs Grade One Science

The clearest difference is rating: Grade One Science at 5.0 against Explain 3D FREE's 2.0. Explain 3D FREE's advantage is update cadence (every 6 weeks vs every 4 months) and ratings volume (5 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Grade One Science holds the better App Store score, 5.0 against 2.0. That said, the two scores are not equally well evidenced: Explain 3D FREE has 5 ratings behind it against 1, so its average is the more settled of the two.

Explain 3D FREE ships an update every 6 weeks, Grade One Science every 4 months. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Explain 3D FREE | Grade One Science |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.0 (5 ratings)](https://appshunter.io/ios/app/explain-3d-free-understand-how-stuff-works/id968247111/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/grade-one-science/id6736531855/reviews)** |
| Number of ratings | **5** | 1 |
| Positive reviews | 14.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 4 months |
| Monetization | Free | Free |
| Size | 84 MB | 201 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Explain 3D](https://appshunter.io/developer/1019479194) | [360ed Pte Ltd](https://appshunter.io/developer/1459468188) |

## What reviewers say

### Explain 3D FREE

[App page](https://appshunter.io/ios/app/explain-3d-free-understand-how-stuff-works/id968247111)

Explore interactive 3D simulations to understand how various systems and objects function. This free version includes a 4-stroke engine simulation, with more available in the full version. It aims to make learning engaging and fun through detailed models and animations.

**Highlights:** Interactive 3D simulations, Understand how things work, Car engine simulation (free), Detailed 3D models and animations, Engaging educational content, Intuitive interface

**Features:** Vision Pro support

**In-app purchases:** none


### Grade One Science

[App page](https://appshunter.io/ios/app/grade-one-science/id6736531855)

This app introduces fundamental science concepts for first graders through interactive lessons, engaging videos, and immersive 3D models. It supports classroom learning and independent exploration, helping to improve critical thinking and knowledge retention.

**Highlights:** Interactive lessons, Engaging educational videos, Immersive 3D models, Practice exercises, Progress tracking

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Explain 3D FREE free?

Explain 3D FREE is free to download, with no in-app purchases.

### Is Grade One Science free?

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

### Which has better reviews, Explain 3D FREE or Grade One Science?

Grade One Science is rated higher. Explain 3D FREE averages 2.0 out of 5 from 5 ratings, while Grade One Science averages 5.0 from 1 ratings.

### Do Explain 3D FREE or Grade One Science have ads?

Neither Explain 3D FREE nor Grade One Science shows ads.

### Which is updated more often, Explain 3D FREE or Grade One Science?

Explain 3D FREE ships an update every 6 weeks, and Grade One Science every 4 months. Most recently, Explain 3D FREE was updated on November 1, 2026 and Grade One Science on October 30, 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.*