# RedbackINSTALL vs Crosswind Calculator

The clearest difference is in-app purchases: RedbackINSTALL at none against Crosswind Calculator's 1. RedbackINSTALL also leads on ads (none vs shown) and iOS requirement (10.1 vs 18.0). Crosswind Calculator's advantage is update cadence (weekly vs every 6 weeks). On price and device support there is nothing between them.

Both are free to download. Crosswind Calculator sells 1 one-off in-app purchase. RedbackINSTALL asks for nothing beyond the download.

RedbackINSTALL ships an update every 6 weeks, Crosswind Calculator weekly. The most recent releases landed on September 17, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | RedbackINSTALL | Crosswind Calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 weeks | **Weekly** |
| Size | 113 MB | 28 MB |
| Requires iOS | **10.1** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Redback Technologies](https://appshunter.io/developer/1070020850) | [Liam Robertson](https://appshunter.io/developer/1896319368) |

## What reviewers say

### RedbackINSTALL

[App page](https://appshunter.io/ios/app/redbackinstall/id1457916762)

**Features:** macOS Compatibility

**In-app purchases:** none


### Crosswind Calculator

[App page](https://appshunter.io/ios/app/crosswind-calculator/id6766731330)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $3.99 | one-time |


## Frequently asked questions

### Is RedbackINSTALL free?

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

### Is Crosswind Calculator free?

Crosswind Calculator is free to download, with in-app purchases available.

### Do RedbackINSTALL or Crosswind Calculator have ads?

Crosswind Calculator shows ads; RedbackINSTALL does not.

### Which is updated more often, RedbackINSTALL or Crosswind Calculator?

RedbackINSTALL ships an update every 6 weeks, and Crosswind Calculator weekly. Most recently, RedbackINSTALL was updated on September 17, 2026 and Crosswind Calculator on September 23, 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.*