Comparison

π Challenge vs NBack³

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

Head to head
About

π Challenge

Features
Read full description

"Pi Challenge" is a fun and engaging brain-training game designed to help you memorize Pi while improving your memory and concentration skills. Easy-to-use controls make this game accessible to everyone—just input the next digit of Pi correctly to extend your streak. Be careful—one wrong digit and it's game over! Compete against yourself and your friends, share your best scores on social media, and enjoy a quick brain exercise anytime, anywhere. Exciting updates are on the way, including a Time Attack mode, online leaderboards, and educational features to master memorizing Pi. Join the challenge today and become a Pi master!

About

NBack³

This brain training app uses the scientifically proven Dual N-Back method to enhance cognitive functions like working memory, focus, and decision-making. It offers adjustable difficulty levels and tracks progress with a visually engaging interface.

Highlights
  • Dual N-Back method
  • Adjustable difficulty (n=1-5)
  • Enhances working memory
  • Improves inhibitory control
  • Develops attention skills
  • Progress tracking
  • Streak bonus system
Features
Read full description

■ NBack³: The Scientifically Proven Brain Training Game ■ "My memory isn't what it used to be..." "I can't seem to stay focused..." "I want to sharpen my split-second decision-making..." If these sound familiar, NBack³ is the ultimate brain training app designed just for you. ◆ The Ultimate Workout for Your Working Memory ◆ Based on "Dual N-Back" research—a method scientifically proven to enhance cognitive function—NBack³ takes brain training to the next level. Working memory is your brain's ability to temporarily hold and process information. It is the vital foundation for memory, focus, and logical reasoning. ◆ Simple to Play ◆ Memorize the Position, Color, and Character shown on a 3×3 grid. Identify if the current tile matches the one shown "n-steps" ago. Fully adjustable difficulty levels from n=1 to n=5. ◆ 5 Cognitive Functions You’ll Sharpen ◆ Working Memory: Enhance your "mental scratchpad." Inhibitory Control: Filter out distractions and irrelevant info. Selective & Divided Attention: Focus on multiple streams of data simultaneously. Visuospatial Cognition: Recognize spatial relationships with precision. Multitasking Decisiveness: Handle multiple tasks with ease. ◆ Key Features of NBack³ ◆ Stunning Neon UI: A beautiful, modern design for an immersive experience. Dynamic Difficulty: Adjustable n-levels (1–5) to match your progress. Streak Bonus System: Stay sharp and rack up consecutive correct answers. Intuitive Controls: Smooth and responsive gameplay. Quick Sessions: 20-turn sets allow for efficient training in minutes. Progress Tracking: Keep motivated by tracking your scores. Smart Reminders: Daily notifications to keep your streak alive. Personal Bests: Record your highest scores for each N-level. ◆ Perfect For... ◆ Students aiming to boost memory and learning. Professionals looking to improve workplace productivity. Health-conscious individuals interested in brain longevity. Seniors working to prevent cognitive decline. Gamers who love a mental challenge. ◆ The Science ◆ N-back training has been widely reported in research to improve fluid intelligence and cognitive performance. By processing position, color, and character simultaneously, NBack³ delivers a "Triple N-Back" challenge that provides a higher cognitive load for more effective results. ◆ Consistency is Key ◆ Brain training works best when it's a habit. NBack³ is designed to be completed in just a few minutes, making it perfect for your commute or a quick break. Sharpen your mind with the scientifically-backed power of NBack³! Terms of Use: https://planet-firewall-419.notion.site/25d6c3f9d1f680b29d72e5cef4be6fbf Privacy Policy: https://www.notion.so/NBack-1f06c3f9d1f6807aa983c83530910b0d Subscription Details: Premium Plan: 120 JPY / month (tax incl.) Auto-Renewal: Can be canceled up to 24 hours before the period ends. Management: App Store Settings > Subscriptions

Screenshots

π Challenge3 screens
NBack³3 screens

Verdict

The call

The clearest difference is in-app purchases: π Challenge at none against NBack³'s 1. π Challenge also leads on ads (none vs shown) and iOS requirement (13.0 vs 17.0). NBack³'s advantage is update cadence (every 4 days vs every 9 months). On price 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. NBack³ sells 1 in-app purchase, starting at $0.49 per month. π Challenge asks for nothing beyond the download.

UpkeepUpdate frequency

π Challenge ships an update every 9 months, NBack³ every 4 days. The most recent releases landed on September 24, 2026 and August 14, 2026 respectively.

Scorecard4 real differences · 4 level
π Challenge versus NBack³: the parameters behind the verdict, then further details
Parameterπ ChallengeNBack³
PriceFreeFree
Positive reviews—71.4% of reviews
Update frequencyEvery 9 monthsEvery 4 days — better
AdsNo — betterYes
In-app purchasesNo — betterYes
Monetization—Free with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13.0 — better17.0
Further details — not scored
Size29 MB20 MB
Age rating4+4+
DeveloperWarashibe Tech LLCTaiki Nishimura

In-app purchases

None

π Challenge

No in-app purchases

1 purchases

NBack³

Subscriptions1
  • プレミアムプラン$0.491 Month

Questions

Is π Challenge free?
π Challenge is free to download, with no in-app purchases.
Is NBack³ free?
NBack³ is free to download, with in-app purchases available.
Do π Challenge or NBack³ have ads?
NBack³ shows ads; π Challenge does not.
Which is updated more often, π Challenge or NBack³?
π Challenge ships an update every 9 months, and NBack³ every 4 days. Most recently, π Challenge was updated on September 24, 2026 and NBack³ on August 14, 2026.

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