# Calculator HD Pro vs Units Plus Converter

The clearest difference is price: Calculator HD Pro at $9.99 against Units Plus Converter's $19.99. Units Plus Converter's advantage is in-app purchases (none vs 2) and iOS requirement (8.0 vs 15.2). On rating, review sentiment, ratings volume and update cadence there is nothing between them.

Calculator HD Pro costs $9.99 and Units Plus Converter $19.99 up front. Calculator HD Pro sells 2 one-off in-app purchases. Units Plus Converter asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.8 for Calculator HD Pro against 4.9 for Units Plus Converter. Both are backed by a comparable volume of ratings — 11K and 8.4K respectively. Written reviews are what separate them: 95% of Calculator HD Pro's written reviews are positive against 90% of Units Plus Converter's.

Calculator HD Pro ships an update every 2 months, Units Plus Converter every 5 weeks. The most recent releases landed on November 8, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Calculator HD Pro | Units Plus Converter |
| --- | --- | --- |
| Price | **$9.99** | $19.99 |
| Rating | [4.8 (11K ratings)](https://appshunter.io/ios/app/calculator-hd-pro/id565023649/reviews) | **[4.9 (8.4K ratings)](https://appshunter.io/ios/app/units-plus-converter/id593306620/reviews)** |
| Number of ratings | **11K** | 8.4K |
| Positive reviews | **94.9% of reviews** | 90.5% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 48 MB | 7 MB |
| Requires iOS | 15.2 | **8.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Cider Software LLC](https://appshunter.io/developer/465180756) | [Alan Mrvica](https://appshunter.io/developer/593306623) |

## What reviewers say

### Calculator HD Pro

[App page](https://appshunter.io/ios/app/calculator-hd-pro/id565023649)

This app offers a powerful and customizable calculator experience with a dual-line display for seeing input and results simultaneously. Save and organize your calculations with history, labeling, and email options. Personalize layouts, themes, and fonts for a comfortable and efficient user experience.

**Highlights:** Dual-line display, Multi-line input, Calculation history, Customizable layouts and themes, Full scientific functions, Left-handed mode, VoiceOver accessibility

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Widget | $1.99 | one-time |
| Multiple History Tapes | $1.99 | one-time |

**What reviewers like**

- 🚀 Significantly better than Apple's calculator
- 👍 Excellent app with great features
- 👍 Flawless app, very useful
- 👍 Fantastic calculator, meets all needs
- 👍 Best calculator app, highly recommended

**What reviewers complain about**

- 🐛 Bothersome pop-up review requests
- 🐛 Cannot delete lists in history tapes
- 🐛 Repeated rate and review pop-ups

**Reported bugs**

- Cannot delete lists in history tapes
- Ads still appear after purchasing full version

**Requested features**

- Add binary, decimal, and hex conversion
- Ability to manually sort result lines
- Add a tax calculation button


### Units Plus Converter

[App page](https://appshunter.io/ios/app/units-plus-converter/id593306620)

Easily convert between various units and currencies with a simple, intuitive interface. Features live currency updates for 155 world currencies, refreshed every 15 minutes. Optimized for a wide range of Apple devices, including iPads with Split View support.

**Highlights:** Unit conversion across 12 categories, Live currency updates for 155 currencies, Optimized for iPhone and iPad, iPad Split View support, Data-computer data conversion, Fuel-mileage conversion

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

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to use
- 🚀 Convenient and reliable
- 💰 Worth the purchase
- 🌍 Helpful for travel and international use
- 📊 Comprehensive range of conversions

**What reviewers complain about**

- 🐛 Occasional crashes or bugs
- 🔢 Limited unit options in some categories
- 🔍 Unintuitive interface for certain conversions
- 💰 Overpriced for the features offered

**Reported bugs**

- Decimal input not working
- Currency conversion not updating properly
- App crashing on certain devices

**Requested features**

- Add feet and inches conversion option
- Include kilojoules to calories conversion
- Improve currency conversion accuracy
- Add time zone conversion feature
- Provide more advanced unit options (e.g. torque, density)


## Frequently asked questions

### Is Calculator HD Pro free?

Calculator HD Pro costs $9.99, and also offers in-app purchases.

### Is Units Plus Converter free?

Units Plus Converter costs $19.99, with no in-app purchases.

### Which has better reviews, Calculator HD Pro or Units Plus Converter?

Units Plus Converter is rated higher. Calculator HD Pro averages 4.8 out of 5 from 11K ratings, while Units Plus Converter averages 4.9 from 8.4K ratings.

### Do Calculator HD Pro or Units Plus Converter have ads?

Neither Calculator HD Pro nor Units Plus Converter shows ads.

### Which is updated more often, Calculator HD Pro or Units Plus Converter?

Calculator HD Pro ships an update every 2 months, and Units Plus Converter every 5 weeks. Most recently, Calculator HD Pro was updated on November 8, 2026 and Units Plus Converter on November 6, 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.*