# BitBacked vs Calk USA

The clearest difference is in-app purchases: BitBacked at none against Calk USA's 1. BitBacked also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. Calk USA sells 1 one-off in-app purchase. BitBacked asks for nothing beyond the download.

BitBacked ships an update every 2 months, Calk USA every 5 weeks. The most recent releases landed on October 14, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | BitBacked | Calk USA |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Size | 13 MB | 150 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [AI REKALL INC](https://appshunter.io/developer/1469941423) | [Konstantin Iakovlev](https://appshunter.io/developer/1896744607) |

## What reviewers say

### BitBacked

[App page](https://appshunter.io/ios/app/bitbacked/id6755203467)

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

**In-app purchases:** none


### Calk USA

[App page](https://appshunter.io/ios/app/calk-usa/id6778818228)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $4.99 | one-time |


## Frequently asked questions

### Is BitBacked free?

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

### Is Calk USA free?

Calk USA is free to download, with in-app purchases available.

### Do BitBacked or Calk USA have ads?

Calk USA shows ads; BitBacked does not.

### Which is updated more often, BitBacked or Calk USA?

BitBacked ships an update every 2 months, and Calk USA every 5 weeks. Most recently, BitBacked was updated on October 14, 2026 and Calk USA on October 17, 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.*