Wrist Cards vs pi!
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Wrist Cards
Practice multiplication facts on your wrist with this flashcard app. It offers a basic practice mode and a quiz option, with the ability to focus on specific digits. Designed for standalone watches, it's ideal for kids to practice math anywhere.
- Multiplication flashcards
- Practice mode
- Quiz mode
- Customizable digit focus
- Apple Watch compatible
- Family Setup compatible
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Flash cards on your Apple Watch, compatible with Family Setup. My kids needed a way to practice their math facts anytime, anywhere, and I couldn't find a flash card app that worked on standalone watches. So we made our own! Has a basic practice mode, as well as an option to take a quiz. Can also configure it to only challenge you with certain digits.
pi!
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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 price: pi! at Free against Wrist Cards's $0.99. Wrist Cards's advantage is chart position (#190 vs unranked) and iOS requirement (15.6 vs 26.0). On 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
pi! is free to download; Wrist Cards costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | Wrist Cards | pi! |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 39 months | — |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Best chart rank | #190 — better | — |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, Apple Watch |
| Requires iOS | 15.6 — better | 26.0 |
| Further details — not scored | ||
| Size | 1 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Spaddlewit Inc. | Sijun Yang |
In-app purchases
Wrist Cards
No in-app purchases
pi!
No in-app purchases
