# CalConvert vs Adding Machine 10Key Universal

The clearest difference is price: Adding Machine 10Key Universal at $3.99 against CalConvert's $24.99. Adding Machine 10Key Universal also leads on review sentiment (94% vs 76%) and chart position (#158 vs unranked). On rating, ratings volume, update cadence and ads there is nothing between them.

CalConvert costs $24.99 and Adding Machine 10Key Universal $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.6 for CalConvert against 4.7 for Adding Machine 10Key Universal. Both are backed by a comparable volume of ratings — 299 and 136 respectively. Written reviews are what separate them: 76% of CalConvert's written reviews are positive against 94% of Adding Machine 10Key Universal's.

CalConvert ships an update every 5 weeks, Adding Machine 10Key Universal every 2 months. The most recent releases landed on October 12, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | CalConvert | Adding Machine 10Key Universal |
| --- | --- | --- |
| Price | $24.99 | **$3.99** |
| Rating | [4.6 (299 ratings)](https://appshunter.io/ios/app/calconvert-pro-calculator/id420224323/reviews) | **[4.7 (136 ratings)](https://appshunter.io/ios/app/adding-machine-10key-universal/id579385939/reviews)** |
| Number of ratings | **299** | 136 |
| Positive reviews | 75.8% of reviews | **94.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 2 months |
| Monetization | Paid | Paid |
| Best chart rank | — | **#158** |
| Size | 267 MB | 23 MB |
| Requires iOS | 15.6 | **12.4** |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Maple Media Apps, LLC](https://appshunter.io/developer/1289801633) | [Richard Silverman](https://appshunter.io/developer/297096643) |

## What reviewers say

### CalConvert

[App page](https://appshunter.io/ios/app/calconvert-pro-calculator/id420224323)

This app offers a powerful scientific calculator, extensive unit conversion capabilities across dozens of categories, and real-time foreign exchange rates for over 150 currencies. It also includes a world clock and convenient home screen widgets for quick access to its functions.

**Highlights:** Advanced scientific calculator, Extensive unit conversions (600+ units), Real-time currency exchange rates (150+ currencies), World Clock functionality, Home screen widgets for quick access, Calculation history tape

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Comprehensive and easy to use
- 🎨 Variety of skins/themes
- 💻 Works great on iPad
- ⚙️ Powerful scientific/conversion features
- 🔍 Clear and readable display

**What reviewers complain about**

- 🐛 Bugs with screen layout and display issues
- 🔄 Slow startup/loading times
- 🔧 Lack of updates and maintenance
- 🔊 Audio focus issues with other apps
- 🔒 Lack of Retina support in paid version

**Reported bugs**

- Screen layout issues in iPad portrait mode
- Inconsistent behavior when switching between portrait and landscape
- Paid version lacks Retina display support

**Requested features**

- Add widget support for quick calculations
- Implement fraction and tip calculator features
- Expand scientific functions for Apple Watch
- Improve memory management and performance
- Add customization options like dark mode


### Adding Machine 10Key Universal

[App page](https://appshunter.io/ios/app/adding-machine-10key-universal/id579385939)

**Currently charting:** #158 Top Paid · Finance (US App Store)

This app emulates a traditional 10-key adding machine for precise calculations. It offers features like reversed operator entry, percentage calculation, and the ability to review and edit entries on a digital paper tape. Users can save, export, and print their calculation tapes.

**Highlights:** 10-key adding machine emulation, Reversed operator entry, Percentage calculation, Digital paper tape with editing, Save and export tapes (PDF), TypeTone audio feedback (iPad)

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to use
- 🧮 Acts like an adding machine
- 🧾 Digital tape for review
- 🖨️ Can print tape
- 💾 Can save/export results

**What reviewers complain about**

- 🐛 Outdated and no support
- 🐛 Doesn't work for new iPad
- 🐛 Total only shows non-zero decimals
- 🐛 Ridiculous method to clear tape
- 🐛 % key not functional

**Reported bugs**

- Cannot save taped
- Cannot export results
- Does not work for new iPad
- Total only shows digits after the decimal that aren't zero
- Method to clear the tape is ridiculous

**Requested features**

- Add widget
- Add realistic sounds
- Add iCloud sync
- Improve tape clearing method
- Clarify functionality of % and +/- keys


## Frequently asked questions

### Is CalConvert free?

CalConvert costs $24.99, with no in-app purchases.

### Is Adding Machine 10Key Universal free?

Adding Machine 10Key Universal costs $3.99, with no in-app purchases.

### Which has better reviews, CalConvert or Adding Machine 10Key Universal?

Adding Machine 10Key Universal is rated higher. CalConvert averages 4.6 out of 5 from 299 ratings, while Adding Machine 10Key Universal averages 4.7 from 136 ratings.

### Do CalConvert or Adding Machine 10Key Universal have ads?

Neither CalConvert nor Adding Machine 10Key Universal shows ads.

### Which is updated more often, CalConvert or Adding Machine 10Key Universal?

CalConvert ships an update every 5 weeks, and Adding Machine 10Key Universal every 2 months. Most recently, CalConvert was updated on October 12, 2026 and Adding Machine 10Key Universal on October 14, 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.*