# BILLeBOOK vs Dual Calculator

The clearest difference is ads: BILLeBOOK at none against Dual Calculator's shown. BILLeBOOK also leads on update cadence (every 3 weeks vs every 5 months) and iOS requirement (13.0 vs 15.0). On price, in-app purchases and device support there is nothing between them.

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

BILLeBOOK ships an update every 3 weeks, Dual Calculator every 5 months. The most recent releases landed on October 1, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | BILLeBOOK | Dual Calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 3 weeks** | Every 5 months |
| Size | 32 MB | 33 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ketan Sharma](https://appshunter.io/developer/1453581837) | [Huzaib Sayyed](https://appshunter.io/developer/1778310247) |

## What reviewers say

### BILLeBOOK

[App page](https://appshunter.io/ios/app/billebook-software/id1606010812)

**In-app purchases:** none


### Dual Calculator

[App page](https://appshunter.io/ios/app/dual-calculator-split-screen/id6738931674)

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

**In-app purchases:** none


## Frequently asked questions

### Is BILLeBOOK free?

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

### Is Dual Calculator free?

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

### Do BILLeBOOK or Dual Calculator have ads?

Dual Calculator shows ads; BILLeBOOK does not.

### Which is updated more often, BILLeBOOK or Dual Calculator?

BILLeBOOK ships an update every 3 weeks, and Dual Calculator every 5 months. Most recently, BILLeBOOK was updated on October 1, 2026 and Dual Calculator on October 4, 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.*