Learn Pi By Karina vs π Challenge
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Learn Pi By Karina
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.
- 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
Read full descriptionHide full description
Pi By Karina is an app which simplifies the learning process in memorizing the digits of Pi. The app is inspired by a technique that my daughter and I utilized in order to assist her for her Pi Contest at school on March 14th (Pi 3.14 = 3/14 = March 14). Other apps available do not break up the digits into simple smaller groups of numbers. Pi By Karina does this! You can learn many more digits of pi by breaking down the group of numbers as you would in learning a new phone number. Add a little tune to it, and you are set! Good luck! See you on Pi Day! Pi By Karina will go to 10,000 digits of Pi! Also when in testing mode, a scoreboard of the elapsed time will appear so you can see and track how many digits of Pi you can type in a certain amount of time!
π Challenge
Read full descriptionHide full description
"Pi Challenge" is a fun and engaging brain-training game designed to help you memorize Pi while improving your memory and concentration skills. Easy-to-use controls make this game accessible to everyone—just input the next digit of Pi correctly to extend your streak. Be careful—one wrong digit and it's game over! Compete against yourself and your friends, share your best scores on social media, and enjoy a quick brain exercise anytime, anywhere. Exciting updates are on the way, including a Time Attack mode, online leaderboards, and educational features to master memorizing Pi. Join the challenge today and become a Pi master!
Screenshots
Verdict
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.
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. 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.
| Parameter | Learn Pi By Karina | π Challenge |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (3 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 25 months | Every 9 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.4 — better | 13.0 |
| Further details — not scored | ||
| Size | 1 MB | 29 MB |
| Age rating | 4+ | 4+ |
| Developer | Sanjay Grover MD, FACS | Warashibe Tech LLC |
In-app purchases
Learn Pi By Karina
No in-app purchases
π Challenge
No in-app purchases
Questions
Is Learn Pi By Karina free?
Is π Challenge free?
Do Learn Pi By Karina or π Challenge have ads?
Which is updated more often, Learn Pi By Karina or π Challenge?
Other comparisons
