# ChronoCalc vs Pressurisation

The clearest difference is update cadence: Pressurisation at every 2 months against ChronoCalc's every 12 months. ChronoCalc's advantage is iOS requirement (8.0 vs 17.0). On price, rating, ratings volume and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for ChronoCalc against 5.0 for Pressurisation. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

ChronoCalc ships an update every 12 months, Pressurisation every 2 months. The most recent releases landed on September 25, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | ChronoCalc | Pressurisation |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/chronocalc/id927026325/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/pressurisation/id956245284/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 237 MB | 9 MB |
| Requires iOS | **8.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Augusta University](https://appshunter.io/developer/319778530) | [Riccardo Arrigoni](https://appshunter.io/developer/956245283) |

## What reviewers say

### ChronoCalc

[App page](https://appshunter.io/ios/app/chronocalc/id927026325)

This app simplifies time calculations, offering features like addition, subtraction, multiplication, and division of time intervals. It supports various time formats, millisecond precision, and provides an activity timer for elapsed time tracking.

**Highlights:** Time addition, subtraction, multiplication, division, Millisecond precision, AM/PM and 24-hour time formats, Intervals in H:M:S:MS or decimals, Activity timer for elapsed time, Convert between hours, minutes, seconds, milliseconds, Multiple color schemes

**Features:** macOS Compatibility

**In-app purchases:** none


### Pressurisation

[App page](https://appshunter.io/ios/app/pressurisation/id956245284)

Visualize aircraft cabin pressurization with realistic cockpit instruments. Explore different aircraft types and monitor key metrics like cabin altitude and differential pressure. Ideal for aviation enthusiasts and students.

**Highlights:** Cockpit-style instrument displays, Multiple aircraft type modes, Cabin altitude monitoring, Differential pressure display, Cabin climb rate indicator, Ground speed display

**In-app purchases:** none


## Frequently asked questions

### Is ChronoCalc free?

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

### Is Pressurisation free?

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

### Which has better reviews, ChronoCalc or Pressurisation?

ChronoCalc and Pressurisation are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do ChronoCalc or Pressurisation have ads?

Neither ChronoCalc nor Pressurisation shows ads.

### Which is updated more often, ChronoCalc or Pressurisation?

ChronoCalc ships an update every 12 months, and Pressurisation every 2 months. Most recently, ChronoCalc was updated on September 25, 2026 and Pressurisation on October 1, 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.*