# Back in Time vs FractionAndProbability

The clearest difference is price: FractionAndProbability at Free against Back in Time's $7.99. FractionAndProbability also leads on update cadence (every 2 days vs every 7 months). Back in Time's advantage is ads (none vs shown). On in-app purchases, device support and iOS requirement there is nothing between them.

FractionAndProbability is free to download; Back in Time costs $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Back in Time ships an update every 7 months, FractionAndProbability every 2 days. The most recent releases landed on October 24, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Back in Time | FractionAndProbability |
| --- | --- | --- |
| Price | $7.99 | **Free** |
| Rating | **[4.7 (27 ratings)](https://appshunter.io/ios/app/back-in-time/id450345693/reviews)** | — |
| Number of ratings | **27** | — |
| Positive reviews | 83.7% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 7 months | **Every 2 days** |
| Monetization | Paid | — |
| Size | 836 MB | 3 MB |
| Requires iOS | **16.0** | 16.6 |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Landka](https://appshunter.io/developer/450345696) | [Katsuhiko Yao](https://appshunter.io/developer/1543188534) |

## What reviewers say

### Back in Time

[App page](https://appshunter.io/ios/app/back-in-time/id450345693)

Explore the history of the Universe, Earth, Life, and Civilization through an immersive, interactive journey. This app uses custom animations, timelines, and interesting facts to bring historical events to life. It's designed to help users understand the connections between events and see the bigger picture.

**Highlights:** Interactive timeline of events, Custom animations and videos, Over 350 remarkable images, Little-known interesting facts, Offline access, Multilingual support

**Features:** macOS Compatibility

**In-app purchases:** none


### FractionAndProbability

[App page](https://appshunter.io/ios/app/fractionandprobability/id6742116020)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Back in Time free?

Back in Time costs $7.99, with no in-app purchases.

### Is FractionAndProbability free?

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

### Do Back in Time or FractionAndProbability have ads?

FractionAndProbability shows ads; Back in Time does not.

### Which is updated more often, Back in Time or FractionAndProbability?

Back in Time ships an update every 7 months, and FractionAndProbability every 2 days. Most recently, Back in Time was updated on October 24, 2026 and FractionAndProbability on October 4, 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.*