# Learn Pi By Karina vs π Pi Challenge

The clearest difference is in-app purchases: Learn Pi By Karina at none against π Pi Challenge's 1. Learn Pi By Karina also leads on ads (none vs shown) and iOS requirement (11.4 vs 13.0). π Pi Challenge's advantage is update cadence (every 2 months vs every 25 months). On price and device support there is nothing between them.

Both are free to download. π Pi Challenge sells 1 in-app purchase, starting at $0.99 per month. Learn Pi By Karina asks for nothing beyond the download.

Learn Pi By Karina ships an update every 25 months, π Pi Challenge every 2 months. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Learn Pi By Karina | π Pi 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** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 25 months | **Every 2 months** |
| Monetization | Free | — |
| Size | 1 MB | 73 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) | [SIC Company Limited](https://appshunter.io/developer/1800842356) |

## 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 Pi Challenge

[App page](https://appshunter.io/ios/app/pi-challenge/id6756227034)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $0.99 | per month |


## Frequently asked questions

### Is Learn Pi By Karina free?

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

### Is π Pi Challenge free?

π Pi Challenge is free to download, with in-app purchases available.

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

π Pi Challenge shows ads; Learn Pi By Karina does not.

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

Learn Pi By Karina ships an update every 25 months, and π Pi Challenge every 2 months. Most recently, Learn Pi By Karina was updated on November 2, 2026 and π Pi Challenge on October 31, 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.*