Dotori Roman Numerals
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About this app
Dotori Roman Numerals converts between ordinary numbers and Roman numerals, in both directions, as you type. Tap either box to choose which side you are editing; the other side updates with every key.
There is no system keyboard. Each box has its own keypad — digits for the Arabic side, the seven Roman letters for the other — so the controls never jump and half the screen is never covered.
Key features:
- Both directions, live. Type 1990 and MCMXC appears; type MCMXC and 1990 appears
- A keypad built for each side. Roman keys are laid out in value order: I V X / L C D / M
- Numbers past 3999, written the classical way. A bar over a group multiplies it by 1000 and a second bar multiplies it again, so 4000 is IV with one bar and 4,000,000 is IV with two. The app draws every bar itself rather than relying on a font, and covers 1 to 3,999,999,999
- Non-standard forms are read, not rejected. IIII, VV and IC all give a value, and the app shows you the standard spelling next to it
- A breakdown you can open: 1990 = M (1000) + CM (900) + XC (90)
- A help page covering the seven symbols, the six subtractive pairs, the repetition limits, the overline rule, and exactly how this app reads non-standard input. Every example is tappable — press one and it loads into the converter
- Dark and light themes, English and Korean, and a screen-orientation choice
- Works entirely offline. No account, no network access beyond the ad banner
Known limits:
- The app starts at 1. Roman numerals have no symbol for zero and no way to write a negative number or a fraction
- There is no text selection or clipboard support yet; tap a digit or letter to put the cursor there and edit from that point
- The overline is drawn, so a screen reader cannot see it as a line. The value box states it in words instead — "overlined I V times one thousand, then X I I, value 4012"
There is no system keyboard. Each box has its own keypad — digits for the Arabic side, the seven Roman letters for the other — so the controls never jump and half the screen is never covered.
Key features:
- Both directions, live. Type 1990 and MCMXC appears; type MCMXC and 1990 appears
- A keypad built for each side. Roman keys are laid out in value order: I V X / L C D / M
- Numbers past 3999, written the classical way. A bar over a group multiplies it by 1000 and a second bar multiplies it again, so 4000 is IV with one bar and 4,000,000 is IV with two. The app draws every bar itself rather than relying on a font, and covers 1 to 3,999,999,999
- Non-standard forms are read, not rejected. IIII, VV and IC all give a value, and the app shows you the standard spelling next to it
- A breakdown you can open: 1990 = M (1000) + CM (900) + XC (90)
- A help page covering the seven symbols, the six subtractive pairs, the repetition limits, the overline rule, and exactly how this app reads non-standard input. Every example is tappable — press one and it loads into the converter
- Dark and light themes, English and Korean, and a screen-orientation choice
- Works entirely offline. No account, no network access beyond the ad banner
Known limits:
- The app starts at 1. Roman numerals have no symbol for zero and no way to write a negative number or a fraction
- There is no text selection or clipboard support yet; tap a digit or letter to put the cursor there and edit from that point
- The overline is drawn, so a screen reader cannot see it as a line. The value box states it in words instead — "overlined I V times one thousand, then X I I, value 4012"
Convert Arabic and Roman numerals both ways, and learn how the notation works
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- No data collectedLearn more about how developers declare collection
What’s new
- Convert Arabic and Roman numerals both ways as you type
- Numbers up to 3,999,999,999 using one bar for thousands and two for millions
- Reads non-standard forms such as IIII and shows the standard spelling
- Help page with the symbols, subtractive pairs and overline rule
- Dark and light themes, English and Korean
- Numbers up to 3,999,999,999 using one bar for thousands and two for millions
- Reads non-standard forms such as IIII and shows the standard spelling
- Help page with the symbols, subtractive pairs and overline rule
- Dark and light themes, English and Korean
Everyone
Learn moreApp support
phone
Phone number
+821022871282
About the developer
곽종근
hugemail2me@gmail.com
South Korea
