Comparison

memoryOS vs Owner Builder Quiz

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

Owner Builder Quiz

Features
Read full description

Ace the 2024 Owner Builder Test with Confidence! Studying the book alone might not be enough. Our app helps you master every aspect of the 2024 Owner Builder Test with over 350 questions, directly based on the latest edition. In just a few weeks, you’ll be ready to pass with ease! The official test is 100 minutes long with 100 questions. To pass, you’ll need at least 70 correct answers . If you don’t pass, a second attempt will be available. With our app, you can practice anytime, anywhere—test your knowledge and get prepared for success! Key Features: • Exam Simulation Mode: Mimic real test conditions and evaluate your readiness. • Full Offline Access: Practice without needing an internet connection. • Customizable Tests: Create exams with up to 100 questions to tailor your study sessions. • Night Mode: Study comfortably at any time with an eye-friendly dark theme. • Timed Exams: Use the integrated timer to simulate the pressure of the real test. Learning for the Owner Builder Test has never been this fun and efficient! * Automatically renewable subscription • Your subscription will be charged to your iTunes account upon confirmation of purchase and will automatically renew (for the selected duration) unless auto-renewal is turned off at least 24 hours before the end of the current period. • The current subscription cannot be canceled during the active subscription period; however, you can manage your subscription and/or turn off auto-renewal by visiting your iTunes account settings after purchase. • Privacy policy and terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ This version gets to the point faster, presents your features more clearly, and keeps users focused on why your app is helpful. Let me know what you think!

Screenshots

memoryOS4 screens
Owner Builder Quiz4 screens

Verdict

The call

The clearest difference is update cadence: Owner Builder Quiz at every 2 days against memoryOS's every 2 weeks. memoryOS's advantage is chart position (#55 vs unranked) and iOS requirement (15.2 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. memoryOS sells 9 in-app purchases, starting at $5.99 per month and Owner Builder Quiz sells 2 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

memoryOS ships an update every 2 weeks, Owner Builder Quiz every 2 days. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.

Scorecard3 real differences · 8 level
memoryOS versus Owner Builder Quiz: the parameters behind the verdict, then further details
ParametermemoryOSOwner Builder Quiz
PriceFreeFree
Rating4.9 (17K ratings) — better—
Positive reviews80.3% of reviews—
Number of ratings17K — better—
Update frequencyEvery 2 weeksEvery 2 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
Best chart rank#55 — better—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.2 — better17.6
Further details — not scored
Size231 MB8 MB
Age rating4+4+
DeveloperEncoder Inc.Marc-antoine BAR

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

Owner Builder Quiz

Not enough reviews yet to summarise bugs or requests.

In-app purchases

9 purchases

memoryOS

Subscriptions9
  • Student Monthly Plan7 Days trial$5.991 Month
  • Essential Weekly Plan7 Days trial$6.997 Days
  • Essential Monthly Plan$15.991 Month
Show 6 more
  • Expert Monthly Plan$27.991 Month
  • Essential Annual Plan7 Days trial2 variants$89.991 Year
  • Expert Annual Plan7 Days trial$148.991 Year
  • Expert Annual Plan1 Month trial$149.991 Year
  • Expert Annual Plan7 Days trial$159.991 Year
  • Expert Annual Plan1 Month trial$159.991 Year
2 purchases

Owner Builder Quiz

Subscriptions2
  • Weekly Subscription$1.997 Days
  • Yearly Subscription$44.991 Year

Questions

Is memoryOS free?
memoryOS is free to download, with in-app purchases available.
Is Owner Builder Quiz free?
Owner Builder Quiz is free to download, with in-app purchases available.
Do memoryOS or Owner Builder Quiz have ads?
Neither memoryOS nor Owner Builder Quiz shows ads.
Which is updated more often, memoryOS or Owner Builder Quiz?
memoryOS ships an update every 2 weeks, and Owner Builder Quiz every 2 days. Most recently, memoryOS was updated on November 4, 2026 and Owner Builder Quiz on October 30, 2026.

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