Comparison

memoryOS vs Mahjpedia

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

Head to head
About

memoryOS

Enhance your memory and focus with interactive lessons and a virtual mind palace game. Learn scientifically proven techniques to improve knowledge retention and recall a wide range of information, from names and numbers to complex data and entire books.

Highlights
  • Interactive bite-sized lessons
  • Virtual Mind Palaces game
  • Spaced repetition system
  • Scientifically proven techniques
  • Improve knowledge retention
  • Memorize diverse information
Features
Read full description

memoryOS contains interactive bite-sized lessons by a 2X World Memory Champion and an educational 3D game of Virtual Mind Palaces - all in one easy-to-use app. It utilizes scientifically proven memory techniques, spaced repetition and patented game mechanics to enhance long-term memory storage and improve knowledge retention. memoryOS is loved by 500,000+ people worldwide because it is a whole new, joyful & game-changing tool for obtaining the most effective memorization skills. Co-founded by Jonas von Essen, who went from struggling to remember to becoming a World Memory Champion, winning on Who Wants To Be a Millionaire, "Jeopardy, and setting a world record by memorizing 100,000 decimals of Pi . memoryOS app has over 18k public worldwide ratings on Apple and Google app stores combined, averaging 4.8 stars. Users also continue adding 5-star reviews daily, sharing how effective and life-changing memoryOS has been for them. Also, memoryOS remains the most crowdfunded app in Kickstarter’s history. Memorization is as important as reading and writing and should be taught as our base skill. Our mission is to enable millions of people to remember needed information easily. With memoryOS, you will learn how to memorize: - Names, Long speeches, Lists of items, Birthdays, Personal facts, Passwords, Trivia, Languages, Vocabulary and phrases, Countries and Capitals, Flags, Historical timeline, Numbers, Periodic table - Content of complete books, Dates of significant events, Complex data structures, Concepts, and figures - Art, Anatomy, Decks of cards, Advanced number systems; Long sequences of numbers, Binary Digits You will also learn: - How to keep track of years, months, weeks, and days - Advanced study techniques, Spaced Repetition system, Speed memorization Why did Google Brands Accelerator recognize memoryOS as being 'Light Years Ahead' in the memory space? • memoryOS delivers results: During our pre-launch phase, thousands of users completed our demo and, on average, had a 70% increase in recall and a 60% increase in recall speed just after the first ~40min session. • Providing your mind with structured storage space: We have spent tens of thousands of hours creating and optimizing our Virtual Mind Palaces, so you don’t have to spend months constructing your own the hard way. These virtual palaces serve as blueprints for your mind's storage space, allowing you to easily encode, store and recall like a memory champion. • A proven innovative approach that works: During our research and development stage, thousands of people of all age groups and even those with difficult medical conditions found memoryOS as an effective and useful tool. Actual results exceeded our team’s expectations. • Gamified edtech at its best: memoryOS has proven to work on people with no prior gaming experience - anyone can use it. Utilizing the power of the Unity game engine, memoryOS is widely accessible on all mobile and tablet devices and is soon coming to VR. -- Joining memoryOS is free. This provides extensive value on the free plan, and you are not obligated to pay to start using it. You can subscribe to a Student Premium plan for as low as $3.49/month when billed annually or $4.99/month when billed monthly (it can be 10-20% higher in some countries due to local taxes). You can subscribe through the 'Shop' section of the memoryOS app and find the above-mentioned or go to your App Store app's profile and choose a desired plan there. Recurring payments will automatically renew unless you cancel your account at least 24 hours before the end of the current subscription period. You can manage your subscription, cancel anytime, or turn off auto-renewal by accessing your iTunes account. Join the memoryOS community of over 500,000+ early adopters who share this memorable journey! -- Terms: memoryOS.com/terms Privacy policy: memoryOS.com/privacy-policy Learn more at: memoryOS.com Contact us: support@memoryOS.com

About

Mahjpedia

Learn and master American Mah Jongg with this comprehensive educational app. Access lessons, guides, and premium features to enhance your gameplay and understanding of the game. Enjoy seamless access across devices with account registration.

Highlights
  • American Mah Jongg education
  • Comprehensive lessons and guides
  • Premium features unlock
  • Cross-device subscription access
  • Account registration for restoration
Features
Read full description

Mahjpedia is powered by The Mahj Connection LLC a company that provides education to the Mah Jongg enthusiast. Debbie Barnett, the President, has been playing American Mah Jongg for over 40 years, as well as teaching, leading groups, and speaking across the country. Debbie is passionate about sharing her love of Mah Jongg to other like-minded Mah Jongg enthusiasts one event at a time. Registration is optional before making a purchase, allowing you to easily subscribe to our features. Once you've made your purchase, you’ll have the option to create an account. This helps you access your subscription across multiple devices and ensures that you can restore your purchased content at any time. Note: Most features in this app are paid, with the exception of a few basic, guiding features. A purchase is required to unlock the full content and functionality. Registration is only needed to link your subscription to your account for seamless access across devices. Access Your Subscription Anytime, Anywhere! Users can easily access all their purchased content and subscriptions by logging into their account on any device. If you switch to a new device, simply log in, and you will automatically regain access to all your premium features without needing to restore purchases separately. To enjoy full access, download now and unlock all premium features for a better experience! Terms of Use: hhttps://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://mahjcon.com/privacy-policy/ Thank you for choosing Mahjpedia!

Screenshots

memoryOS4 screens
Mahjpedia4 screens

Verdict

The call

The clearest difference is rating: memoryOS at 4.9 against Mahjpedia's 4.0. memoryOS also leads on ratings volume (17K vs 8) and chart position (#54 vs unranked). On price, review sentiment, update cadence and ads 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. memoryOS sells 23 in-app purchases, starting at $3.99 per 7 days and Mahjpedia sells 4 in-app purchases, starting at $4.99 per year. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

memoryOS holds the better App Store score, 4.9 against 4.0. That said, the two scores are not equally well evidenced: memoryOS has 17K ratings behind it against 8, so its average is the more settled of the two. Written reviews complicate that: 80% of memoryOS's written reviews are positive against 83% of Mahjpedia's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

memoryOS ships an update every 2 weeks, Mahjpedia fortnightly. The most recent releases landed on October 23, 2026 and October 10, 2026 respectively.

Scorecard4 real differences · 7 level
memoryOS versus Mahjpedia: the parameters behind the verdict, then further details
ParametermemoryOSMahjpedia
PriceFreeFree
Rating4.9 (17K ratings) — better4.0 (8 ratings)
Positive reviews80.4% of reviews83.3% of reviews — better
Number of ratings17K — better8
Update frequencyEvery 2 weeksFortnightly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
Best chart rank#54 — better—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.2 — better16.6
Further details — not scored
Size248 MB61 MB
Age rating4+17+
DeveloperEncoder Inc.The Mahj Connection, LLC

Customer experience

memoryOS

All ratings16,799 ratings
Positive97.2%
Neutral1.0%
Negative1.8%
Written reviews1,692 reviews
Positive80.4%
Neutral4.8%
Negative14.8%

Mahjpedia

All ratings8 ratings
Positive75.0%
Neutral0.0%
Negative25.0%
Written reviews6 reviews
Positive83.3%
Neutral0.0%
Negative16.7%

Bugs and requests

memoryOS

Reported bugs

5 issues
  • Login issues and account management problems
  • Frequent crashes and app instability
  • Navigation and UI elements not working as expected
  • Syncing issues between devices and lost progress
  • Connectivity problems when using cellular data

Requested features

5 requests
  • More free content and lessons
  • Ability to create custom memory palaces
  • Better progress tracking and analytics
  • Integration with other learning/productivity apps
  • Offline mode for lessons and memory palaces

Mahjpedia

Not enough reviews yet to summarise bugs or requests.

In-app purchases

23 purchases

memoryOS

Subscriptions20
  • Student Weekly Plan$3.997 Days
  • Student Monthly Plan7 Days trial$5.991 Month
  • Expert Weekly Plan7 Days trial$6.997 Days
Show 17 more
  • Essential Weekly Plan7 Days trial$6.997 Days
  • Essential Monthly Plan7 Days trial$14.991 Month
  • Essential Monthly Plan2 variants$14.991 Month
  • Essential Monthly Plan$16.991 Month
  • Student 3 Months Plan$19.993 Months
  • Expert Monthly Plan$24.991 Month
  • Expert Monthly Plan$29.991 Month
  • Expert 3 Months Plan7 Days trial$49.993 Months
  • Expert 3 Months Plan$69.993 Months
  • Expert 6 Months Plan7 Days trial$89.996 Months
  • Essential Annual Plan1 Month trial$89.991 Year
  • Essential Annual Plan7 Days trial3 variants$89.991 Year
  • Essential Annual Plan14 Days trial$89.991 Year
  • Expert Annual Plan7 Days trial$148.991 Year
  • Expert Annual Plan1 Month trial$149.991 Year
  • Expert Annual Plan7 Days trial$174.991 Year
  • Expert Annual Plan1 Month trial$174.991 Year
One-time3
  • 10 Hearts$0.99
  • 10 Loci Coins$2.99
  • 50 Loci Coins$14.99
4 purchases

Mahjpedia

Subscriptions1
  • Mahjpedia$4.991 Year
One-time3
  • Mahjpedia$0.99
  • Mahjpedia$4.99
  • Mahjpedia$44.99

Questions

Is memoryOS free?
memoryOS is free to download, with in-app purchases available.
Is Mahjpedia free?
Mahjpedia is free to download, with in-app purchases available.
Which has better reviews, memoryOS or Mahjpedia?
memoryOS is rated higher. memoryOS averages 4.9 out of 5 from 17K ratings, while Mahjpedia averages 4.0 from 8 ratings.
Do memoryOS or Mahjpedia have ads?
Neither memoryOS nor Mahjpedia shows ads.
Which is updated more often, memoryOS or Mahjpedia?
memoryOS ships an update every 2 weeks, and Mahjpedia fortnightly. Most recently, memoryOS was updated on October 23, 2026 and Mahjpedia on October 10, 2026.

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