Comparison

π Pi Challenge vs pi!

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

Head to head
About

π Pi Challenge

Features
Read full description

An app for memorizing the digits of Pi. It supports up to 30 million digits… totally unnecessary, but fun. Comes with a ranking feature! Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

pi!

Features
Read full description

How many digits of π can you memorize? π Memorizer helps you learn and recall the digits of pi using a simple, focused approach: see the digits, hide them, type them back. No gimmicks — just effective memorization. LEARN • Study digits in customizable chunks of 5, 10, or 20 • See the digits, then hide and input them from memory • Pick up right where you left off — progress saves automatically • Browse all 10,000 digits with your learned positions highlighted • Tap any group to jump to that position and start practicing TEST • Type digits of π from memory as fast as you can • Timer starts on your first tap — no pressure until you're ready • See your entered digits organized in clean, readable groups • Wrong digit? Game over. See exactly where you went wrong and what the correct digit was • Beat your personal record and track your improvement STATS • Personal best record, learning progress, current streak • Average speed (digits per second), total sessions, and practice time • Full session history to review past attempts APPLE WATCH • Quick-test on the go with a compact numpad • Best record syncs with your iPhone via WatchConnectivity DESIGNED FOR APPLE • Liquid Glass design language — beautiful on iOS 26, iPadOS, and macOS • Apple Pencil Scribble support on iPad — write digits by hand • iCloud sync keeps your progress across all your devices • Haptic feedback on every tap for a satisfying input experience Whether you're a math enthusiast, a memory athlete, or just curious how far you can go — π Memorizer is your companion for the journey from 3.14 to 3.14159265358979323846…

Screenshots

π Pi Challenge2 screens
pi!4 screens

Verdict

The call

The clearest difference is in-app purchases: pi! at none against π Pi Challenge's 1. pi! also leads on ads (none vs shown). π Pi Challenge's advantage is iOS requirement (13.0 vs 26.0). 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. π Pi Challenge sells 1 in-app purchase, starting at $0.99 per month. pi! asks for nothing beyond the download.

Scorecard3 real differences · 3 level
π Pi Challenge versus pi!: the parameters behind the verdict, then further details
Parameterπ Pi Challengepi!
PriceFreeFree
Update frequencyEvery 2 months—
AdsYesNo — better
In-app purchasesYesNo — better
DevicesiPhone, iPad, iPodiPhone, iPad, Apple Watch
Requires iOS13.0 — better26.0
Further details — not scored
Size73 MB4 MB
Age rating4+4+
DeveloperSIC Company LimitedSijun Yang

In-app purchases

1 purchases

π Pi Challenge

Subscriptions1
  • Monthly Subscription$0.991 Month
None

pi!

No in-app purchases

Questions

Is π Pi Challenge free?
π Pi Challenge is free to download, with in-app purchases available.
Is pi! free?
pi! is free to download, with no in-app purchases.
Do π Pi Challenge or pi! have ads?
π Pi Challenge shows ads; pi! does not.

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