# Back in Time for iPhone vs HKBUniverse

The clearest difference is price: HKBUniverse at Free against Back in Time for iPhone's $4.99. HKBUniverse also leads on update cadence (every 3 months vs every 8 months) and device support (4 vs 1). On ads, in-app purchases and iOS requirement there is nothing between them.

HKBUniverse is free to download; Back in Time for iPhone costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Back in Time for iPhone ships an update every 8 months, HKBUniverse every 3 months. The most recent releases landed on October 23, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Back in Time for iPhone | HKBUniverse |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[3.8 (16 ratings)](https://appshunter.io/ios/app/back-in-time-for-iphone/id483148811/reviews)** | — |
| Number of ratings | **16** | — |
| Positive reviews | 71.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 3 months** |
| Monetization | Paid | — |
| Size | 625 MB | 1.8 GB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 17+ |
| Developer | [Landka](https://appshunter.io/developer/450345696) | [Hong Kong Baptist University](https://appshunter.io/developer/427917925) |

## What reviewers say

### Back in Time for iPhone

[App page](https://appshunter.io/ios/app/back-in-time-for-iphone/id483148811)

Explore the history of the universe, Earth, life, and civilization through interactive timelines, stunning visuals, and custom animations. This app offers an immersive learning experience with social and historical context for key events.

**Highlights:** Interactive timelines, Over 350 images, 60+ animations and videos, 200+ interesting facts, Offline access, Multilingual support

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

**In-app purchases:** none


### HKBUniverse

[App page](https://appshunter.io/ios/app/hkbuniverse/id1669663392)

**In-app purchases:** none


## Frequently asked questions

### Is Back in Time for iPhone free?

Back in Time for iPhone costs $4.99, with no in-app purchases.

### Is HKBUniverse free?

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

### Do Back in Time for iPhone or HKBUniverse have ads?

Neither Back in Time for iPhone nor HKBUniverse shows ads.

### Which is updated more often, Back in Time for iPhone or HKBUniverse?

Back in Time for iPhone ships an update every 8 months, and HKBUniverse every 3 months. Most recently, Back in Time for iPhone was updated on October 23, 2026 and HKBUniverse 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.*