XLII vs Bitcoin Mempool
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
XLII
Read full descriptionHide full description
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.
Bitcoin Mempool
Read full descriptionHide full description
Bitcoin memory pool visualization tool, which displays the pending transactions in the Bitcoin network in real time through blocks of different colors and sizes. It supports transaction details viewing and dynamic display of handling fees.
Screenshots
Verdict
The clearest difference is price: XLII at Free against Bitcoin Mempool's $0.99. Bitcoin Mempool's advantage is update cadence (every 3 weeks vs every 12 months) and iOS requirement (12.0 vs 17.6). On 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
XLII is free to download; Bitcoin Mempool costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
XLII ships an update every 12 months, Bitcoin Mempool every 3 weeks. The most recent releases landed on October 11, 2026 and September 29, 2026 respectively.
| Parameter | XLII | Bitcoin Mempool |
|---|---|---|
| Price | Free — better | $0.99 |
| Update frequency | Every 12 months | Every 3 weeks — 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 | 29 MB |
| Age rating | 4+ | 4+ |
| Developer | telethon k.k. | 艳华 赵 |
In-app purchases
XLII
No in-app purchases
Bitcoin Mempool
No in-app purchases









