Comparison

memoryOS vs Thought Saver

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

Thought Saver

This app helps you build a better daily routine with tools like meditation timers, journaling, and chatbots. It also uses spaced repetition to help you remember important ideas and offers daily quizzes and pre-made flashcard decks for learning.

Highlights
  • Daily routine integration
  • Spaced repetition algorithm
  • Meditation timers
  • Gratitude journaling
  • Interactive chatbots
  • Daily quizzes
  • Flashcard decks
Features
Read full description

Discover a refreshed Thought Saver - your free, everyday companion for personal growth. We've added features to help you shape a wholesome daily routine, alongside our smart spaced repetition algorithm that helps remember important ideas. New routine tools: Integrate meditation timers, interactive chatbots, and gratitude journaling into your day. Smart spaced repetition: Our algorithm considers the importance of an idea and how well you recall it, helping you remember what truly matters. Daily quizzes: Expand your learning streak with handy quiz reminders. Idea exploration: Draw inspiration from our pre-existing flashcard decks and learn something new every day. Multi-platform sync: Seamless sync between our web app, mobile, and browser extension. Offline access: Create cards and take quizzes offline - we'll auto-sync once you're back online. Share with friends: Effortlessly share your cards and ideas via our cloud-based auto-syncing.

Screenshots

memoryOS4 screens
Thought Saver4 screens

Verdict

The call

The clearest difference is in-app purchases: Thought Saver at none against memoryOS's 28. Thought Saver also leads on review sentiment (100% vs 80%). memoryOS's advantage is ratings volume (16K vs 12) and chart position (#63 vs unranked). On price, rating, 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 20 in-app purchases, starting at $3.99 per 7 days. Thought Saver asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.9 for memoryOS against 4.8 for Thought Saver. That said, the two scores are not equally well evidenced: memoryOS has 16K ratings behind it against 12, so its average is the more settled of the two. Written reviews are what separate them: 80% of memoryOS's written reviews are positive against 100% of Thought Saver's.

UpkeepUpdate frequency

memoryOS ships an update every 3 weeks, Thought Saver every 2 weeks. The most recent releases landed on September 26, 2026 and August 29, 2026 respectively.

Scorecard5 real differences · 6 level
memoryOS versus Thought Saver: the parameters behind the verdict, then further details
ParametermemoryOSThought Saver
PriceFreeFree
Rating4.9 (16K ratings) — better4.8 (12 ratings)
Positive reviews80.4% of reviews100.0% of reviews — better
Number of ratings16K — better12
Update frequencyEvery 3 weeksEvery 2 weeks — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
Best chart rank#63 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.215.0 — better
Further details — not scored
Size248 MB41 MB
Age rating4+12+
DeveloperEncoder Inc.SparkWave

Customer experience

memoryOS

All ratings16,060 ratings
Positive97.2%
Neutral1.0%
Negative1.8%
Written reviews1,641 reviews
Positive80.4%
Neutral4.9%
Negative14.7%

Thought Saver

All ratings12 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews5 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

Thought Saver

Not enough reviews yet to summarise bugs or requests.

In-app purchases

20 purchases

memoryOS

Subscriptions17
  • Student Weekly Plan$3.997 Days
  • Student Monthly Plan7 Days trial$4.991 Month
  • Expert Weekly Plan7 Days trial$6.997 Days
Show 14 more
  • Essential Weekly Plan7 Days trial$6.997 Days
  • Essential Monthly Plan3 variants$14.991 Month
  • Essential Monthly Plan7 Days trial$14.991 Month
  • Student 3 Months Plan$19.993 Months
  • Expert Monthly Plan2 variants$24.991 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 Plan7 Days trial$149.991 Year
  • Expert Annual Plan1 Month trial2 variants$149.991 Year
One-time3
  • 10 Hearts$0.99
  • 10 Loci Coins$2.99
  • 50 Loci Coins$14.99
None

Thought Saver

No in-app purchases

Questions

Is memoryOS free?
memoryOS is free to download, with in-app purchases available.
Is Thought Saver free?
Thought Saver is free to download, with no in-app purchases.
Which has better reviews, memoryOS or Thought Saver?
memoryOS is rated higher. memoryOS averages 4.9 out of 5 from 16K ratings, while Thought Saver averages 4.8 from 12 ratings.
Do memoryOS or Thought Saver have ads?
Neither memoryOS nor Thought Saver shows ads.
Which is updated more often, memoryOS or Thought Saver?
memoryOS ships an update every 3 weeks, and Thought Saver every 2 weeks. Most recently, memoryOS was updated on September 26, 2026 and Thought Saver on August 29, 2026.

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