Comparison

Learn Pi By Karina vs Pi

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

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
Read 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!

About

Pi

Explore the infinite digits of the mathematical constant π with unparalleled precision. Access millions of digits offline or trillions via the internet. Ideal for students, mathematicians, or anyone curious about this fundamental number.

Highlights
  • Calculate first N digits of Pi
  • Find the Nth digit of Pi
  • Arbitrary precision up to 50,000 digits offline
  • Unlimited digits via internet API
  • Calculation history
  • Copy and share results
Features
Read full description

Discover π like never before. Pi — Infinite Digits lets you calculate any decimal of the mathematical constant π with absolute precision. Whether you're a student, a mathematician, or simply curious, this app gives you access to the infinite digits of π directly on your iPhone. Two powerful modes: First N digits — Display the first N decimal digits of π, from 1 to 50,000 locally, and beyond via the internet. Nth digit — Find exactly which digit appears at any position in π. What is the 1,000,000th decimal? Find out in milliseconds. Unmatched precision: Pi uses the Chudnovsky algorithm, one of the fastest known methods for computing π, combined with arbitrary-precision arithmetic (BigInt). Every digit is mathematically exact — no floating point approximation, ever. For large numbers: Beyond 50,000 digits, Pi seamlessly connects to Google's pi.delivery API, giving you access to over 100 trillion decimal digits of π. The largest calculation ever made, right in your pocket. Features: Arbitrary precision up to 50,000 digits — fully offline Unlimited digits via internet (Google pi.delivery) Real-time progress bar with elapsed time Calculation history (last 5 results) Copy result to clipboard Export and share your results Clean, intuitive interface No ads, no subscriptions, no data collection Did you know? π (pi) is an irrational number — its decimals never repeat and never end. Mathematicians have computed over 100 trillion digits. Now you can explore them too.

Screenshots

Learn Pi By Karina3 screens
Pi3 screens

Verdict

The call

The clearest difference is rating: Learn Pi By Karina at 5.0 against Pi's 4.0. Learn Pi By Karina also leads on ratings volume (3 vs 1) and iOS requirement (11.4 vs 17.6). Pi's advantage is update cadence (every 2 days vs every 25 months). On price, ads, in-app purchases and monetization model 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

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

Learn Pi By Karina holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 3 and 1 respectively.

UpkeepUpdate frequency

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

Scorecard4 real differences · 6 level
Learn Pi By Karina versus Pi: the parameters behind the verdict, then further details
ParameterLearn Pi By KarinaPi
PriceFreeFree
Rating5.0 (3 ratings) — better4.0 (1 ratings)
Positive reviews100.0% of reviews—
Number of ratings3 — better1
Update frequencyEvery 25 monthsEvery 2 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS11.4 — better17.6
Further details — not scored
Size1 MB4 MB
Age rating4+4+
DeveloperSanjay Grover MD, FACSOlivier Mallet

In-app purchases

None

Learn Pi By Karina

No in-app purchases

None

Pi

No in-app purchases

Questions

Is Learn Pi By Karina free?
Learn Pi By Karina is free to download, with no in-app purchases.
Is Pi free?
Pi is free to download, with no in-app purchases.
Which has better reviews, Learn Pi By Karina or Pi?
Learn Pi By Karina is rated higher. Learn Pi By Karina averages 5.0 out of 5 from 3 ratings, while Pi averages 4.0 from 1 ratings.
Do Learn Pi By Karina or Pi have ads?
Neither Learn Pi By Karina nor Pi shows ads.
Which is updated more often, Learn Pi By Karina or Pi?
Learn Pi By Karina ships an update every 25 months, and Pi every 2 days. Most recently, Learn Pi By Karina was updated on November 2, 2026 and Pi on October 31, 2026.

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