# Prepper App Pro vs ChronoCalc Pro

The clearest difference is in-app purchases: ChronoCalc Pro at none against Prepper App Pro's 1. ChronoCalc Pro also leads on update cadence (every 8 days vs every 6 months) and iOS requirement (16.6 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. Prepper App Pro sells 1 one-off in-app purchase. ChronoCalc Pro asks for nothing beyond the download.

Prepper App Pro ships an update every 6 months, ChronoCalc Pro every 8 days. The most recent releases landed on October 16, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Prepper App Pro | ChronoCalc Pro |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 8 days** |
| Size | 12 MB | 4 MB |
| Requires iOS | 26.0 | **16.6** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 12+ | 4+ |
| Developer | [FOUTURE](https://appshunter.io/developer/1497510909) | [ERLEND JOHNSRUD VAAGE](https://appshunter.io/developer/1760100550) |

## What reviewers say

### Prepper App Pro

[App page](https://appshunter.io/ios/app/prepper-app-pro/id6654924460)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Prepper Full Access | $8.99 | one-time |


### ChronoCalc Pro

[App page](https://appshunter.io/ios/app/chronocalc-pro/id6757017750)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Prepper App Pro free?

Prepper App Pro is free to download, with in-app purchases available.

### Is ChronoCalc Pro free?

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

### Do Prepper App Pro or ChronoCalc Pro have ads?

Neither Prepper App Pro nor ChronoCalc Pro shows ads.

### Which is updated more often, Prepper App Pro or ChronoCalc Pro?

Prepper App Pro ships an update every 6 months, and ChronoCalc Pro every 8 days. Most recently, Prepper App Pro was updated on October 16, 2026 and ChronoCalc Pro on October 2, 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.*