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Romanoff

Romanoff

Convert Roman/Arabic Numbers

2 ratings
5 reviews
🔧 Utilities
🔍 Reference
Free

Details

  • Released
  • Updated
  • March 15, 2013
  • December 15, 2025

Features

Developer

Eduard Schwan
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ipad
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About

Effortlessly convert numbers between Arabic, Roman, and Chinese/Japanese numeral systems. Get instant conversions as you type, with support for various numeral formats and a range up to 99,999.

✓Arabic to Roman numeral conversion
✓Roman to Arabic numeral conversion
✓Arabic to Chinese/Japanese numeral conversion
✓Chinese/Japanese to Arabic numeral conversion
✓Supports numbers up to 39,999 (Roman) and 99,999 (Chinese/Japanese)
✓Automatic correction of Roman numeral input (e.g., IIII to IV)
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What's New in Romanoff

1.5.1

December 15, 2025

Support for iOS 26, refreshed app icon

User reviews

Most RecentHighest RatedLowest Rated

Handy little App

Fun App to play around with. Allows you to convert to different number systems and is especially handy with those long Roman numerals - I think I'll try it out on a movie credit, where they show the long Roman numeral in the last frame, denoting the year. Probably very useful for someone who works with different number systems, such as a researcher.
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JasonofocJasonofoc

Not good

It would be better to be able to copy and paste them
Emtionally unstableEmtionally unstable

Response from developer

Finally, you can do that now, with any of the number fields! New in this release!

Outsource Technical

Really cool little app! Easy to use and fun.
Kathleen KrapflKathleen Krapfl

A handy tool for tutoring

I used this with a 5th grader I am tutoring-- he had to do some work in roman numerals, and I asked him to check his own work using the app. It's more fun (and a richer learning experience) for him to use this tool than to have me correct his work for him. And the price is right :)
Kinderteach2Kinderteach2

Very interesting

This app is a lot of fun and very interesting.
Moreover, it is free. Try it, and have fun.
DearmelodyluDearmelodylu

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FAQ

What is the maximum number Romanoff can convert to Roman numerals?

Romanoff can convert any number between 0 and 39,999 for Roman numerals. For Chinese/Japanese numbers, the limit extends up to 99,999.

Does Romanoff support different styles of Roman numeral input?

Yes, Romanoff can convert Roman "guesses" to the correct format. For example, if you type "IIII", it will convert it to 4 and display the more common prefix-notation "IV".

What devices is Romanoff compatible with?

Romanoff is available for iPhone, iPad, and iPod. It is designed for iOS devices.

How often is Romanoff updated?

The latest version, 1.5.1, was last updated on December 15, 2025. The app was initially released on March 15, 2013.

What is the age rating for Romanoff?

Romanoff has an age rating of 4+, making it suitable for young children and up.

Does Romanoff have ads?

No, Romanoff does not contain advertisements. It is a completely free application.

Can Romanoff convert numbers to formal Chinese/Japanese characters?

Yes, Romanoff can convert numbers to both simple and formal "Banking/Financial" characters for Chinese and Japanese numerals.

What is the user rating for Romanoff?

Romanoff has a rating of 4.0 stars based on 2 ratings.