Comparison

Serial 7s vs Pi

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Serial 7 subtraction gameplay
  • Tests attention and memory
  • Helps prevent cognitive decline
  • Measures subtraction speed
  • Randomized starting numbers
Features
Read full description

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.

About

Pi

Test your memory and math skills by recalling digits of Pi in a survival game. Unlock boosters to extend your game and improve your score. Perfect for all ages looking to sharpen their minds.

Highlights
  • Memorize Pi digits in survival mode
  • Unlock boosters for extended gameplay
  • Improve memory and mental math skills
  • Practice multiplication and math facts
  • Climb the leaderboard
  • Designed for all ages
Features
Read full description

Master the digits of Pi in this fast-paced memory survival math game! Challenge your brain to remember as many digits of Pi as possible while unlocking fun boosters that help you keep going. Great for students, families, and math lovers who enjoy improving memory, practicing multiplication, and sharpening mental math skills. Use quick thinking, pattern recognition, and strategy to survive longer and score higher. Unlock powerful boosters, level up your memory, and climb the leaderboard. Whether you’re a math fan or just love a good memory challenge, this game makes it fun and rewarding. Features: • Memorize Pi digits in an exciting survival mode • Use boosters to extend your run and maximize your score • Designed for players of all ages who enjoy math and memory games • Excellent for memory training, focus, and brain sharpness • Quick math challenges that boost mental agility • Supports multiplication and math facts practice • Ideal for family play, brain games, and math challenges Whether you’re into multiplication drills, math facts, memory challenges, or brain training, Pi Math Challenge brings a fun twist to improving your mind. Download now and see how far you can go! Optional in-app purchases available for boosters and bonus credits. Privacy Policy and Terms of Use: https://sites.google.com/view/pisurvival/terms-conditions

Screenshots

Serial 7s4 screens
Pi4 screens

Verdict

The call

The clearest difference is in-app purchases: Serial 7s at none against Pi's 5. Pi's advantage is ads (none vs shown). On price, device support and iOS requirement 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Pi sells 5 one-off in-app purchases. Serial 7s asks for nothing beyond the download.

Scorecard3 real differences · 7 level
Serial 7s versus Pi: the parameters behind the verdict, then further details
ParameterSerial 7sPi
PriceFreeFree
Rating5.0 (1 ratings) — better—
Positive reviews—100.0% of reviews
Number of ratings1 — better—
Update frequencyEvery 5 months—
AdsYesNo — better
In-app purchasesNo — betterYes
MonetizationAd-supported — betterFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.0 — better16.6
Further details — not scored
Size42 MB21 MB
Age rating9+4+
DeveloperHFX LabREMESHY LTD

Customer experience

Serial 7s

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Pi

Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Serial 7s

No in-app purchases

5 purchases

Pi

One-time5
  • 5K Credits$0.99
  • 12K Credits$1.99
  • 25K Credits$2.99
Show 2 more
  • 50K Credits$3.99
  • 100K Credits$4.99

Questions

Is Serial 7s free?
Serial 7s is free to download, with no in-app purchases.
Is Pi free?
Pi is free to download, with in-app purchases available.
Do Serial 7s or Pi have ads?
Serial 7s shows ads; Pi does not.

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