# Roman Calculator vs CONVERT UNITS

The clearest difference is price: CONVERT UNITS at Free against Roman Calculator's $0.99. CONVERT UNITS also leads on update cadence (every 9 days vs every 5 months) and ratings volume (1.4K vs 4). Roman Calculator's advantage is in-app purchases (none vs 2) and ads (none vs shown). On review sentiment and device support there is nothing between them.

CONVERT UNITS is free to download; Roman Calculator costs $0.99 up front. CONVERT UNITS sells 2 in-app purchases, starting at $0.99 per month. Roman Calculator asks for nothing beyond the download.

Roman Calculator holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: CONVERT UNITS has 1.4K ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 80% of Roman Calculator's written reviews are positive against 76% of CONVERT UNITS's.

Roman Calculator ships an update every 5 months, CONVERT UNITS every 9 days. The most recent releases landed on October 22, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Roman Calculator | CONVERT UNITS |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/roman-calculator/id415183786/reviews)** | [4.7 (1.4K ratings)](https://appshunter.io/ios/app/convert-units/id1114969241/reviews) |
| Number of ratings | 4 | **1.4K** |
| Positive reviews | **80.0% of reviews** | 75.8% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 5 months | **Every 9 days** |
| Monetization | Paid | **Ad-supported** |
| Size | 41 MB | 22 MB |
| Requires iOS | 26.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | +4 |
| Developer | [John Millhouse](https://appshunter.io/developer/415183789) | [Adysseus](https://appshunter.io/developer/447444997) |

## What reviewers say

### Roman Calculator

[App page](https://appshunter.io/ios/app/roman-calculator/id415183786)

This calculator handles standard arithmetic and introduces roman numeral calculations, including fractions. Customize the look with different backgrounds and button styles. It offers advanced functions like trigonometry and memory in landscape mode.

**Highlights:** Roman numeral calculations, Roman fraction support, Convert Roman to Arabic and vice versa, Customizable backgrounds and button styles, Advanced functions (sin, cos, tan, sqrt, memory), Landscape mode with expanded functions

**Features:** macOS Compatibility

**In-app purchases:** none


### CONVERT UNITS

[App page](https://appshunter.io/ios/app/convert-units/id1114969241)

Easily convert between various units of measurement including length, weight, temperature, and currency. Features automatic currency updates, a vast selection of currencies, and customizable display options for accuracy and rounding. Optimized for multitasking on iPad and offers a beautiful dark design.

**Highlights:** Converts length, weight, speed, area, time, pressure, volume, power, fuel, temperature, data, and currency, Automatic currency updates, 160 currencies available, Multitasking enabled for iPad, Alphabetical quick links for units, Customizable startup categories, Adjustable accuracy and rounding

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove ads | $0.99 | per month |
| Remove ads | $19.99 | one-time |

**What reviewers like**

- 👍 Quick & easy to use
- 👍 Ease of use
- 👍 Simple and easy to use
- 👍 Well thought out and easy to use
- 👍 Excellent and very reliable

**What reviewers complain about**

- 🐛 Ads obstruct use
- 🐛 Subscription required to remove ads
- 🐛 Currency conversion not working

**Reported bugs**

- App got stuck, required uninstall/reinstall to fix
- Navigation issues, unable to get back to home page

**Requested features**

- Option to convert between functions (length to volume)
- Remember last conversion settings for each category


## Frequently asked questions

### Is Roman Calculator free?

Roman Calculator costs $0.99, with no in-app purchases.

### Is CONVERT UNITS free?

CONVERT UNITS is free to download, with in-app purchases available.

### Which has better reviews, Roman Calculator or CONVERT UNITS?

Roman Calculator is rated higher. Roman Calculator averages 5.0 out of 5 from 4 ratings, while CONVERT UNITS averages 4.7 from 1.4K ratings.

### Do Roman Calculator or CONVERT UNITS have ads?

CONVERT UNITS shows ads; Roman Calculator does not.

### Which is updated more often, Roman Calculator or CONVERT UNITS?

Roman Calculator ships an update every 5 months, and CONVERT UNITS every 9 days. Most recently, Roman Calculator was updated on October 22, 2026 and CONVERT UNITS on October 24, 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.*