# Calculator HD for iPad. vs Duodecuple Calc

The clearest difference is in-app purchases: Duodecuple Calc at none against Calculator HD for iPad.'s 1. Duodecuple Calc also leads on update cadence (every 2 weeks vs every 2 months) and device support (3 vs 1). Calculator HD for iPad.'s advantage is iOS requirement (13.0 vs 15.8.3). On price and ads there is nothing between them.

Both are free to download. Calculator HD for iPad. sells 1 one-off in-app purchase. Duodecuple Calc asks for nothing beyond the download.

Calculator HD for iPad. ships an update every 2 months, Duodecuple Calc every 2 weeks. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Calculator HD for iPad. | Duodecuple Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (41 ratings)](https://appshunter.io/ios/app/calculator-hd-for-ipad/id581460240/reviews)** | — |
| Number of ratings | **41** | — |
| Positive reviews | 83.4% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 100 MB | 36 MB |
| Requires iOS | **13.0** | 15.8.3 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [良峰 侯](https://appshunter.io/developer/654444245) | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) |

## What reviewers say

### Calculator HD for iPad.

[App page](https://appshunter.io/ios/app/calculator-hd-for-ipad/id581460240)

This app provides a powerful and beautifully designed calculator experience for your iPad. It offers both basic and scientific functions, with customizable skins and a history log for your calculations. Enjoy a familiar interface with enhanced features.

**Highlights:** Live voice calculator, Basic and scientific modes, Calculation history, Customizable skins, Display of calculation steps, Dark Mode support

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |

**What reviewers like**

- 👍 Easy to use
- 💡 History of calculations
- 💡 Scientific functions available
- 👍 Large, clear keys
- 👍 Good design/interface

**What reviewers complain about**

- 🐛 Slow to open/load
- 🐛 Inconsistent calculation results (specific instances)
- 🐛 Missing algebraic functions (reported by one user)
- 🐛 Language issues (German not available as expected)
- 🐛 Ad banners present (for many users)

**Reported bugs**

- App crashes after update
- Calculation errors (e.g., 3^2 - 2^2 = 49, 2^4=4)
- Ad banner is intrusive and distracting
- Paid app still shows ads
- Slow to open/load

**Requested features**

- Remove ad banner
- Add German language support
- Improve calculation accuracy for complex functions
- Make an ad-free version available
- Add Binary, Octal, Decimal, and Hexadecimal interconversions


### Duodecuple Calc

[App page](https://appshunter.io/ios/app/duodecuple-calc/id6742208421)

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

**In-app purchases:** none


## Frequently asked questions

### Is Calculator HD for iPad. free?

Calculator HD for iPad. is free to download, with in-app purchases available.

### Is Duodecuple Calc free?

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

### Do Calculator HD for iPad. or Duodecuple Calc have ads?

Both Calculator HD for iPad. and Duodecuple Calc show ads.

### Which is updated more often, Calculator HD for iPad. or Duodecuple Calc?

Calculator HD for iPad. ships an update every 2 months, and Duodecuple Calc every 2 weeks. Most recently, Calculator HD for iPad. was updated on November 1, 2026 and Duodecuple Calc on October 30, 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.*