Serial 7s vs Sky Sprint
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.
Sky Sprint
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Sky Sprint – Neon Speed. No Mercy. Dash through an endless synthwave track filled with shifting tiles and sudden gaps. The speed is relentless, the colors are electric, and one wrong move ends your run. Swipe, Dodge, Survive You’re always sprinting — all you control is your direction. Swipe left or right to stay on the path. Miss? You're done. Every Second Gets Harder The track vanishes behind you, gaps appear faster, and the tempo rises. The better you get, the more brutal it becomes. Addictive by Design Instant retries. No loading. No nonsense. Just one more run… and then another. Retro Future Style With bold neon colors, glowing tiles, and pulsing synth beats, this game feels like an arcade machine from the future. Game Features: * Swipe to move left or right * Fast-paced, endless synthwave runner * Sudden gaps and collapsing paths * Instant restarts and non-stop action * Stylized neon visuals & retro ambiance * Leaderboards for competitive play
Screenshots
Verdict
The clearest difference is iOS requirement: Sky Sprint at 13.0 against Serial 7s's 15.0. 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.
| Parameter | Serial 7s | Sky Sprint |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 5 months | — |
| Ads | Yes | Yes |
| In-app purchases | No | No |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 42 MB | 126 MB |
| Age rating | 9+ | 4+ |
| Developer | HFX Lab | FATCAT GAMES LLC |
In-app purchases
Serial 7s
No in-app purchases
Sky Sprint
No in-app purchases









