π Pi Challenge vs pi!
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
π Pi Challenge
Read full descriptionHide 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/
pi!
Read full descriptionHide 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
Verdict
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
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.
| Parameter | π Pi Challenge | pi! |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 months | — |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Requires iOS | 13.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 73 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | SIC Company Limited | Sijun Yang |
In-app purchases
π Pi Challenge
- Monthly Subscription$0.991 Month
pi!
No in-app purchases









