Comparison

memoryOS vs Dr. Kaizen

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

Dr. Kaizen

Features
Read full description

Fun games for your brain. Keep your brain sharp while having fun. Personality and intelligence tests. You probably know that despite aging, your brain is capable of growing, learning new things, and forming new neural connections. This process is called brain plasticity and requires regular training. DrKaizen - Brain Training offers an excellent way to improve your mental health through entertaining and stimulating mind games. Our quick brain workouts, combined with proper physical exercise and diet, can help keep your brain clear, alert, and ready to tackle daily life challenges. We offer a diverse range of personalized training programs for different brain areas (such as memory, attention, concentration, mental math, problem-solving, creativity, etc.) and training games designed to stimulate your cognitive abilities. The games are sufficiently challenging to ensure progression over time and understanding at any age and knowledge level. DrKaizen - Brain Training offers a 14-day free trial with complete access to games and exercises, without interruptions or advertisements. If you choose to subscribe, subscription fees will be charged based on your country. The subscription amount will be displayed in the app before you make the payment. Payment will be charged to your iTunes account upon purchase confirmation. The subscription automatically renews unless auto-renewal is turned off at least 24 hours before the end of the current period. Renewal will be charged to your account within 24 hours prior to the end of the current period, and the renewal cost will be identified. Subscriptions can be managed by the user, and auto-renewal can be turned off by going to the user's account settings after purchase. No cancellation of the current subscription is allowed during the active subscription period. Customer Support: - For any questions, feedback, or support needs, please contact us. Note: We do not offer or provide any medical advice or other health services, including, but not limited to, any test, diagnosis, or evaluation related to mental health. All recommendations should be considered as suggestions and are provided for educational and entertainment purpose. In case of a health problem, you should consult your doctor or other health professionals. ------ Terms and Conditions - Dr. Kaizen: https://www.gto.wtf/terms Privacy Policy - Dr. Kaizen: https://www.gto.wtf/privacy User License Agreement - Dr. Kaizen Subscription: https://www.apple.com/legal/internet-services/itunes/dev/stdeula Contact: https://www.gto.wtf/help

Screenshots

memoryOS4 screens
Dr. Kaizen4 screens

Verdict

The call

The clearest difference is ads: memoryOS at none against Dr. Kaizen's shown. memoryOS also leads on chart position (#55 vs unranked) and device support (3 vs 1). Dr. Kaizen's advantage is update cadence (weekly vs every 2 weeks). On price and in-app purchases 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 Dr. Kaizen sells 3 in-app purchases, starting at $6.99 per 7 days. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

memoryOS ships an update every 2 weeks, Dr. Kaizen weekly. The most recent releases landed on October 27, 2026 and October 25, 2026 respectively.

Scorecard5 real differences · 6 level
memoryOS versus Dr. Kaizen: the parameters behind the verdict, then further details
ParametermemoryOSDr. Kaizen
PriceFreeFree
Rating4.9 (17K ratings) — better—
Positive reviews80.3% of reviews—
Number of ratings17K — better—
Update frequencyEvery 2 weeksWeekly — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchases—
Best chart rank#55 — better—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.2 — better17.6
Further details — not scored
Size231 MB63 MB
Age rating4+12+
DeveloperEncoder Inc.GTO

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

Dr. Kaizen

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
3 purchases

Dr. Kaizen

Subscriptions2
  • Pro Weekly Unlimited3 Days trial$6.997 Days
  • Pro Yearly Unlimited14 Days trial$24.991 Year
One-time1
  • Energy Refill$0.99

Questions

Is memoryOS free?
memoryOS is free to download, with in-app purchases available.
Is Dr. Kaizen free?
Dr. Kaizen is free to download, with in-app purchases available.
Do memoryOS or Dr. Kaizen have ads?
Dr. Kaizen shows ads; memoryOS does not.
Which is updated more often, memoryOS or Dr. Kaizen?
memoryOS ships an update every 2 weeks, and Dr. Kaizen weekly. Most recently, memoryOS was updated on October 27, 2026 and Dr. Kaizen on October 25, 2026.

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