Comparison

Pi Brain vs Pi

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

Head to head
About

Pi Brain

Test and improve your ability to memorize digits of pi. Challenge yourself and friends to see who can recall the most numbers. This app serves as a fun learning tool for all ages to enhance memory retention.

Highlights
  • Memorize pi digits
  • Test memory recall
  • Score saving
  • Sort scores by date, name, or score
  • Friend contests
  • Learning tool
Features
Read full description

How many digits of pi can you remember? Since pi is an irrational number, the digits never end or repeat. You will probably never have to use more than a dozen digits in any calculation, so why learn the digits of pi? For some people this is a challenge. The Guinness record for remembered digits is 67,890 digits. With this program you will have the opportunity to test your memory, and learn a universal number. Have contests with your friends and family. This is a great learning tool for all ages. You be surprised how much you can remember with a little practice. The option to save the score will only appear if you do not make more than one mistake and do not use the hint or switch to the learn mode. Scores can be sorted by date, name, or score. Use this list to verify your retention over long periods.

About

Pi

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

Pi Brain1 screens
Pi3 screens

Verdict

The call

The clearest difference is update cadence: Pi at every 2 days against Pi Brain's every 5 months. Pi Brain's advantage is iOS requirement (6.0 vs 17.6). 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

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

Pi Brain ships an update every 5 months, Pi every 2 days. The most recent releases landed on October 15, 2026 and October 10, 2026 respectively.

Scorecard2 real differences · 8 level
Pi Brain versus Pi: the parameters behind the verdict, then further details
ParameterPi BrainPi
PriceFreeFree
Rating3.7 (9 ratings) — better—
Positive reviews84.4% of reviews—
Number of ratings9 — better—
Update frequencyEvery 5 monthsEvery 2 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS6.0 — better17.6
Further details — not scored
Size3 MB4 MB
Age rating4+4+
DeveloperHenry ChanOlivier Mallet

Bugs and requests

Pi Brain

Reported bugs

8 issues
  • Screen 'jumps' past ~100 digits
  • Score history deleted on update
  • Keyboard pops up and blocks buttons
  • Cannot save scores
  • App shuts down without saving score
Show 3 more
  • Latest update does not work
  • Frustrating bugs with saving/resetting
  • Blocks what row you are on after 40 digits

Requested features

10 requests
  • Allow starting from any digit
  • Option to not count '3' in row divisions
  • Add a clear button on test page
  • Practice mode for digits already mastered
  • Levels based on digits learned
Show 5 more
  • Leaderboard for competitive play
  • Ability to turn off sound
  • Graphics makeover
  • Option to save score at every mistake
  • Option to reset without closing app

Pi

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Pi Brain

No in-app purchases

None

Pi

No in-app purchases

Questions

Is Pi Brain free?
Pi Brain is free to download, with no in-app purchases.
Is Pi free?
Pi is free to download, with no in-app purchases.
Do Pi Brain or Pi have ads?
Neither Pi Brain nor Pi shows ads.
Which is updated more often, Pi Brain or Pi?
Pi Brain ships an update every 5 months, and Pi every 2 days. Most recently, Pi Brain was updated on October 15, 2026 and Pi on October 10, 2026.

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