Serial 7s vs 초성퀴즈!
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Serial 7s
This game challenges you to rapidly subtract 7 from a starting number until you can no longer continue. It's based on a cognitive test used to assess attention and memory, with consistent play potentially improving brain skills and helping to prevent cognitive decline.
- Serial 7 subtraction gameplay
- Tests attention and memory
- Helps prevent cognitive decline
- Measures subtraction speed
- Randomized starting numbers
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Serial 7s is a brain training game that tests how fast you can perform continuous subtraction of 7 from a starting number. Inspired by the classic "Serial 7s" task—a standard component of the Mini-Mental State Examination (MMSE)—this game gives a proven cognitive test a fresh twist. Starting with a randomly generated number between 99 and 105, your total time to complete 14 consecutive subtractions of 7 is measured. Serial subtraction by 7 is widely used to evaluate focus, attention span, and working memory. Regular practice can help sharpen your mind and boost cognitive fitness. Recommended for anyone interested in brain training, keeping their mind active, or supporting long-term cognitive health and dementia prevention.
초성퀴즈!
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간단하고 재밌는 초성퀴즈입니다! 간단한 초성퀴즈를 통해 즐겁게 두뇌운동을 하며 어휘력을 향상할 수 있습니다! ▶꾸준한 업데이트 새로운 퀴즈가 꾸준히 업데이트됩니다. ▶다양한 난이도 다양한 분야의 단어로 구성되어 있어 게임을 즐기며 어휘력을 향상시킬 수 있습니다. ▶모든 콘텐츠가 무료 다양한 퍼즐들을 무료로 즐겨보세요. * 삭제 시 데이터가 초기화됩니다.
Screenshots
Verdict
The clearest difference is update cadence: 초성퀴즈! at every 3 weeks against Serial 7s's every 5 months. 초성퀴즈! also leads on iOS requirement (13.0 vs 15.0). 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
Serial 7s ships an update every 5 months, 초성퀴즈! every 3 weeks. The most recent releases landed on October 20, 2026 and October 24, 2026 respectively.
| Parameter | Serial 7s | 초성퀴즈! |
|---|---|---|
| Price | Free — better | — |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 5 months | Every 3 weeks — better |
| Ads | Yes | Yes |
| In-app purchases | No | No |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 42 MB | 224 MB |
| Age rating | 9+ | 4+ |
| Developer | HFX Lab | jingyoung lee |
In-app purchases
Serial 7s
No in-app purchases
초성퀴즈!
No in-app purchases
