# Learn Pi By Karina vs π Challenge

The clearest difference is update cadence: π Challenge at every 9 months against Learn Pi By Karina's every 25 months. Learn Pi By Karina's advantage is iOS requirement (11.4 vs 13.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Learn Pi By Karina ships an update every 25 months, π Challenge every 9 months. The most recent releases landed on October 10, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Learn Pi By Karina | π Challenge |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/learn-pi-by-karina/id1219552192/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 25 months | **Every 9 months** |
| Monetization | Free | — |
| Size | 1 MB | 29 MB |
| Requires iOS | **11.4** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sanjay Grover MD, FACS](https://appshunter.io/developer/508941289) | [Warashibe Tech LLC](https://appshunter.io/developer/1567747524) |

## What reviewers say

### Learn Pi By Karina

[App page](https://appshunter.io/ios/app/learn-pi-by-karina/id1219552192)

This app helps users memorize the digits of Pi by breaking them into smaller, manageable groups. It's inspired by a method used to prepare for Pi Day contests, making memorization more accessible. Features include a testing mode with a scoreboard to track progress.

**Highlights:** Breaks Pi digits into smaller groups, Inspired by contest preparation methods, Supports memorization of up to 10,000 digits, Testing mode with elapsed time scoreboard, Track typing speed for Pi digits

**In-app purchases:** none


### π Challenge

[App page](https://appshunter.io/ios/app/challenge/id6743357759)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Learn Pi By Karina free?

Learn Pi By Karina is free to download, with no in-app purchases.

### Is π Challenge free?

π Challenge is free to download, with no in-app purchases.

### Do Learn Pi By Karina or π Challenge have ads?

Neither Learn Pi By Karina nor π Challenge shows ads.

### Which is updated more often, Learn Pi By Karina or π Challenge?

Learn Pi By Karina ships an update every 25 months, and π Challenge every 9 months. Most recently, Learn Pi By Karina was updated on October 10, 2026 and π Challenge on October 25, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*