# Leonhard Euler vs Parallel Chronology

The clearest difference is price: Parallel Chronology at Free against Leonhard Euler's $1.99. Parallel Chronology also leads on iOS requirement (13.0 vs 15.6). On update cadence, ads, in-app purchases and device support there is nothing between them.

Parallel Chronology is free to download; Leonhard Euler costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Leonhard Euler ships an update every 3 months, Parallel Chronology every 5 months. The most recent releases landed on September 25, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Leonhard Euler | Parallel Chronology |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/parallel-chronology/id1462606267/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 64.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 5 months |
| Monetization | — | Free |
| Size | 42 MB | 14 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPad, Mac, Apple TV | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Ventura Educational Systems](https://appshunter.io/developer/371324172) | [Neusara LLC](https://appshunter.io/developer/1462606266) |

## What reviewers say

### Leonhard Euler

[App page](https://appshunter.io/ios/app/leonhard-euler/id1451119959)

**Features:** Vision Pro support

**In-app purchases:** none


### Parallel Chronology

[App page](https://appshunter.io/ios/app/parallel-chronology/id1462606267)

Explore historical events and fictional timelines side-by-side. Compare information across different categories and time periods, from the dawn of the universe to the present and beyond. Discover new insights by juxtaposing diverse data points on an infinitely scrolling timeline.

**Highlights:** Side-by-side information display, Story units for comparative analysis, Infinite scroll timeline (99.9 billion BC to 99.9 billion AD), Tool for historical discovery, Supports custom fictional data, Links to Wikipedia for details, Universal device support (iPhone/iPad)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Leonhard Euler free?

Leonhard Euler costs $1.99, with no in-app purchases.

### Is Parallel Chronology free?

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

### Do Leonhard Euler or Parallel Chronology have ads?

Neither Leonhard Euler nor Parallel Chronology shows ads.

### Which is updated more often, Leonhard Euler or Parallel Chronology?

Leonhard Euler ships an update every 3 months, and Parallel Chronology every 5 months. Most recently, Leonhard Euler was updated on September 25, 2026 and Parallel Chronology on September 20, 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.*