XLII vs ReadableCalc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
XLII
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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 - Ge'ez 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 Ge'ez to binary, or from Japanese to Babylonian. Some (ancient) formats don't support large numbers.
ReadableCalc
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ReadableCalc is a calculator app that displays large numbers—like 3 trillion 500 billion—in readable units. It’s designed to make extremely large numbers more intuitive at a glance. Main Features • Supports four basic operations (+, −, ×, ÷) • Displays results in English numeric units for easy readability • Handles decimals and negative numbers • DEL button for deleting one character at a time (Long press to clear the entire expression) • Long press on expressions or results to copy • Tap on the “readable” result to toggle display between: • Short scale / Long scale / Kanji numerals Additional features in landscape mode: • “00”, “000”, and “0000” buttons for quickly adding zeros • “x²” and “x³” buttons for quick exponentiation Note: • Numbers exceeding 200 digits may be rounded due to calculation and display limitations. Please be cautious if you need high precision. • Short scale and Long scale support numbers up to 10^198. • Kanji numeral display supports up to 10^72. Larger numbers are shown in Arabic numerals instead.
Screenshots
Verdict
The clearest difference is update cadence: ReadableCalc at weekly against XLII's every 12 months. ReadableCalc also leads on iOS requirement (12.0 vs 17.6). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
XLII ships an update every 12 months, ReadableCalc weekly. The most recent releases landed on October 11, 2026 and October 7, 2026 respectively.
| Parameter | XLII | ReadableCalc |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 12 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Requires iOS | 17.6 | 12.0 — better |
| Further details — not scored | ||
| Size | 15 MB | 28 MB |
| Age rating | 4+ | 4+ |
| Developer | telethon k.k. | YONAGARE LAB |
In-app purchases
XLII
No in-app purchases
ReadableCalc
No in-app purchases









