2357P vs lostphone#9
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
2357P
A simple number-based game where players decompose and compose numbers using prime bases 2, 3, 5, and 7. Aim to achieve higher scores and compete on the Game Center leaderboard.
- Number decomposition
- Number composition
- Prime number bases (2, 3, 5, 7)
- Score-based gameplay
- Game Center leaderboard integration
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2357P is a simple game about number. 2, 3, 5 and 7 can compose many numbers, decompose numbers with these base numbers and go for higher score! 2 * 3 = 6 2 * 3 * 5 = 30 2 * 3 * 5 * 7 = 210 2 * 2 * 3 * 5 = 60 2 * 2 * 3 * 5 * 7 = 420 P = any prime number that can't be decomposed Try to break the record and see who's on the Game Center leaderboard!
lostphone#9
Test your memory by trying to recall phone numbers. This game challenges you to remember more numbers than the average person in today's digital age.
- Memory challenge
- Phone number recall
- Nostalgic theme
- Simple gameplay
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How many phone numbers can the human brain memorize? As the cellphones spreading, human has ceased to remember phone numbers. In the 1980s, people had memorized the telephone numbers of several friends, families, and colleagues. This is a challenge for you living today.
Screenshots
Verdict
The clearest difference is iOS requirement: lostphone#9 at 7.0 against 2357P's 15.0. On price, update cadence, ads and in-app purchases 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.
2357P ships an update every 15 months, lostphone#9 every 19 months. The most recent releases landed on October 15, 2026 and October 6, 2026 respectively.
| Parameter | 2357P | lostphone#9 |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (2 ratings) — better | — |
| Positive reviews | — | 50.0% of reviews |
| Number of ratings | 2 — better | — |
| Update frequency | Every 15 months — better | Every 19 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.0 | 7.0 — better |
| Further details — not scored | ||
| Size | 6 MB | 45 MB |
| Age rating | 4+ | 4+ |
| Developer | Yuantong Lu | takeshi nagahara |
Customer experience
2357P
lostphone#9
In-app purchases
2357P
No in-app purchases
lostphone#9
No in-app purchases
