Comparison

memoryOS vs SWDI

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 with interactive lessons and a 3D virtual mind palace game. This app uses scientifically proven techniques like spaced repetition to boost long-term memory storage and knowledge retention. It's designed to make memorization skills joyful and effective for everyone.

Highlights
  • Interactive memory lessons
  • 3D Virtual Mind Palaces
  • Spaced repetition system
  • Gamified learning
  • Memorize names, lists, numbers, and more
  • Advanced study techniques
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

SWDI

Access personalized progression plans and track your development. Enjoy features like offline synchronization and progress monitoring. The app is free to download with optional one-time purchases for in-app content.

Highlights
  • Personalized progression plans
  • Progress tracking
  • Offline synchronization
  • One-time in-app purchases
  • Free download
Features
Read full description

Here you get access to SWDI progression plans INFORMATION ABOUT THE APP AND PURCHASE OPTIONS By signing up, you will get access to subscription(s) that include features such as progress tracking, and offline sync. The download of SWDI is free of charge. Should you use SWDI app to access in-app content via available one-time purchase(s), a payment will be charged to your credit card once. Read our full Terms of Service and our Privacy Policy: https://passion.io/terms-of-service https://passion.io/privacy-policy

Screenshots

memoryOS4 screens
SWDI2 screens

Verdict

The call

The clearest difference is ads: memoryOS at none against SWDI's shown. memoryOS also leads on ratings volume (17K vs 13) and update cadence (fortnightly vs every 3 months). SWDI's advantage is review sentiment (100% vs 80%). On price, rating, 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. memoryOS sells 9 in-app purchases, starting at $5.99 per month and SWDI sells 10 one-off in-app purchases. 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 4.7. That said, the two scores are not equally well evidenced: memoryOS has 17K ratings behind it against 13, so its average is the more settled of the two. Written reviews complicate that: 80% of memoryOS's written reviews are positive against 100% of SWDI's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

memoryOS ships an update fortnightly, SWDI every 3 months. The most recent releases landed on November 11, 2026 and November 3, 2026 respectively.

Scorecard5 real differences · 6 level
memoryOS versus SWDI: the parameters behind the verdict, then further details
ParametermemoryOSSWDI
PriceFreeFree
Rating4.9 (17K ratings) — better4.7 (13 ratings)
Positive reviews80.2% of reviews100.0% of reviews — better
Number of ratings17K — better13
Update frequencyFortnightly — betterEvery 3 months
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
Best chart rank#52 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.215.1 — better
Further details — not scored
Size232 MB118 MB
Age rating4+4+
DeveloperEncoder Inc.Jens Frank

Customer experience

memoryOS

All ratings17,203 ratings
Positive97.2%
Neutral1.0%
Negative1.8%
Written reviews1,723 reviews
Positive80.2%
Neutral5.0%
Negative14.9%

SWDI

All ratings13 ratings
Positive92.3%
Neutral0.0%
Negative7.7%
Written reviews7 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

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

SWDI

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
10 purchases

SWDI

One-time10
  • Obedience - Sit.$45.00
  • Basic directionals.$45.00
  • Down$45.00
Show 7 more
  • Transport$45.00
  • Come to handlers side$45.00
  • Indication - Detection$49.99
  • Laser Directionals$49.99
  • Detection foundations$54.99
  • Tracking$59.00
  • Buried targets$69.00

Questions

Is memoryOS free?
memoryOS is free to download, with in-app purchases available.
Is SWDI free?
SWDI is free to download, with in-app purchases available.
Which has better reviews, memoryOS or SWDI?
memoryOS is rated higher. memoryOS averages 4.9 out of 5 from 17K ratings, while SWDI averages 4.7 from 13 ratings.
Do memoryOS or SWDI have ads?
SWDI shows ads; memoryOS does not.
Which is updated more often, memoryOS or SWDI?
memoryOS ships an update fortnightly, and SWDI every 3 months. Most recently, memoryOS was updated on November 11, 2026 and SWDI on November 3, 2026.

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