Roman/Arabic/Oriental number converter

Available for iPhone/iPad (iOS 12 and up)

Overview | Features | Buy | What's New | Screen Shots | FAQ/Tips | Contact Info | Company


What year was MCMXCIX?

How do you write 333 or 1066 in Roman numerals?

What is 88,237 in Japanese or Chinese using the simple characters, or using the traditional "Banker/Financial" characters?  Romanoff will show you in a heartbeat.

SchwanSongs presents an elegant Roman/Arabic/Oriental number converter, for free!


  • Handles any number between 0 and 39,999 for Roman, or up to 99,999 for either Chinese or Japanese.
  • No need to "switch modes", just type your Roman or Arabic number.
  • Allows you to type Roman "guesses" and it converts them to proper prefixed format for you. For example, if you type "IIII", it will convert it to 4 and print the more common prefix-notation "IV".
  • Software is localized into: French, Spanish, German, Russian, Swedish, Chinese Simplified and Traditional, Japanese.

Pricing & Download

Free! Download it from the App Store, click here.

What's New

1.5.0, July 2021

  • You can tap each converted number to copy it to the clipboard for pasting into other documents.
  • Better screen layout on all device sizes, and supports accessibility text resizing.
  • Support for iOS 12 and up.

Some ScreenShots...

iPhone (English):
iPad dark mode (Japanese):


  • You can now tap any converted number to copy it to the clipboard for pasting into other documents

Privacy Policy

Yes, we have a Privacy Policy. Read it here.

Contact Information

Have more questions? Want to send me feedback?
Contact me here!