# Calc Pro HD vs Duodecuple Calc

The clearest difference is in-app purchases: Duodecuple Calc at none against Calc Pro HD's 10. Duodecuple Calc also leads on update cadence (every 2 weeks vs every 3 months) and device support (3 vs 1). Calc Pro HD's advantage is iOS requirement (9.0 vs 15.8.3). On price and ads there is nothing between them.

Both are free to download. Calc Pro HD sells 10 one-off in-app purchases. Duodecuple Calc asks for nothing beyond the download.

Calc Pro HD ships an update every 3 months, Duodecuple Calc every 2 weeks. The most recent releases landed on October 15, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Calc Pro HD | Duodecuple Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (1.4K ratings)](https://appshunter.io/ios/app/calc-pro-hd-ipad-calculator/id457004119/reviews)** | — |
| Number of ratings | **1.4K** | — |
| Positive reviews | 88.8% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 59 MB | 36 MB |
| Requires iOS | **9.0** | 15.8.3 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Panoramic Software Inc.](https://appshunter.io/developer/329216366) | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) |

## What reviewers say

### Calc Pro HD

[App page](https://appshunter.io/ios/app/calc-pro-hd-ipad-calculator/id457004119)

This app offers a comprehensive suite of 10 powerful calculators and 10 financial worksheets, designed to replace your physical calculator. It includes scientific, graphing, unit conversion, and financial tools, catering to students and professionals for a wide range of calculations.

**Highlights:** 10 powerful calculators, 10 financial worksheets, Scientific calculator with RPN, Graphing calculator, Unit converter (3000+ conversions), World currencies converter, Date & Time calculator

**Features:** macOS Compatibility

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Base Conversions | $0.99 | one-time |
| Date & Time Calculator | $0.99 | one-time |
| Design Pack | $0.99 | one-time |
| Graphing Calculator | $0.99 | one-time |
| Statistics Calculator | $0.99 | one-time |
| World Currencies | $0.99 | one-time |
| Constants | $1.99 | one-time |
| Financial Calculator | $1.99 | one-time |
| Unit Converter | $1.99 | one-time |
| Full Version | $7.99 | one-time |

**What reviewers like**

- 🚀 Comprehensive features
- 👍 Easy to use
- 💡 Versatile with various calculators
- 🔒 No ads in free version
- 👍 Large, clear buttons

**What reviewers complain about**

- 🐛 Conversion errors
- 💰 Expensive to unlock all features
- 🐛 Crashes and compatibility issues
- 🔒 Requires re-purchasing on new devices

**Reported bugs**

- Crashes on iOS 14.3
- Currency converter not updating

**Requested features**

- Bluetooth keyboard support
- Statistical functions
- Landscape mode on iPad
- Improved date/time calculator


### 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 Calc Pro HD free?

Calc Pro HD 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 Calc Pro HD or Duodecuple Calc have ads?

Both Calc Pro HD and Duodecuple Calc show ads.

### Which is updated more often, Calc Pro HD or Duodecuple Calc?

Calc Pro HD ships an update every 3 months, and Duodecuple Calc every 2 weeks. Most recently, Calc Pro HD was updated on October 15, 2026 and Duodecuple Calc on October 10, 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.*