XLII app for iPhone and iPad

XLII - Explore Numbers and Numerals help you learn about, discover, and explore number and numerals from around the world, ranging from familiar Roman numerals to the ancient Kharoṣṭhī script. You even can use your camera to scan numbers and convert them to an interesting output format. 

To achieve full immersion, use the XLII Clock widget to display the current date and time in a number format of your choosing directly in your Home Screen.

XLII - Explore Numbers and Numerals supports:
- Arabic numerals (naturally)
- Roman numerals
- Japanese numerals (including financial notation)
- Babylonian Cuneiform numerals (base 60)
- Aegean numerals (Linear B script)
- Chinese counting rods (籌)
- Egyptian Hieroglyphs
- Suzhou numbers (蘇州碼子)
- Phoenician numbers
- Kharoṣṭhī numerals
- Brahmi numerals
- Glagolitic numerals
- Cyrillic numerals
- Geez numbers
- Sundanese numbers
- Tibetan numbers
- Mongolian numbers
- hexadecimal, binary, octal, vigesimal, etc.
- spell-out notation for many languages

Most formats are also accepted as input, e.g. you can convert from Roman to Cyrillic, from Geez to binary, or from Japanese to Babylonian. Some (ancient) formats dont support large numbers.