# BIG BANG TO US vs Electrical Engineer

The clearest difference is in-app purchases: Electrical Engineer at none against BIG BANG TO US's 1. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. BIG BANG TO US sells 1 one-off in-app purchase. Electrical Engineer asks for nothing beyond the download.

BIG BANG TO US ships an update every 2 weeks, Electrical Engineer weekly. Both last shipped on November 6, 2026.

## The numbers

| Metric | BIG BANG TO US | Electrical Engineer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/big-bang-to-us/id6795024569/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 2 weeks | **Weekly** |
| Monetization | Free with in-app purchases | — |
| Size | 474 MB | 71 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sang Heon Park](https://appshunter.io/developer/1675276100) | [hyuncheol seo](https://appshunter.io/developer/6797554122) |

## What reviewers say

### BIG BANG TO US

[App page](https://appshunter.io/ios/app/big-bang-to-us/id6795024569)

Explore the 13.8-billion-year history of the universe interactively. Trace the journey from the Big Bang to the formation of elements that make up your body. Discover the science, experience the timeline, and engage with a captivating story.

**Highlights:** Interactive universe timeline, Explore element origins, Cinematic science documentary, Immersive visual experience, Sci-fi story mode, Access production materials

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| BIG BANG TO US Unlock | $6.99 | one-time |


### Electrical Engineer

[App page](https://appshunter.io/ios/app/electrical-engineer-passrun/id6798078541)

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

**In-app purchases:** none


## Frequently asked questions

### Is BIG BANG TO US free?

BIG BANG TO US is free to download, with in-app purchases available.

### Is Electrical Engineer free?

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

### Do BIG BANG TO US or Electrical Engineer have ads?

Both BIG BANG TO US and Electrical Engineer show ads.

### Which is updated more often, BIG BANG TO US or Electrical Engineer?

BIG BANG TO US ships an update every 2 weeks, and Electrical Engineer weekly. Most recently, BIG BANG TO US was updated on November 6, 2026 and Electrical Engineer on November 6, 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.*