Comparison

memoryOS vs Spark

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

Spark

Engage with daily learning puzzles centered around a single theme. Explore history, science, and pop culture through four unique, human-crafted games designed for discovery and fun.

Highlights
  • Daily themed puzzles
  • Four unique game modes
  • Human-crafted puzzles
  • Explore history, science, and pop culture
  • Archive of past puzzles
  • No timers or tests
Read full description

Replace doomscrolling with learning. Each day, Spark explores a single theme through thoughtful puzzles spanning ancient history, mythology, movies, food, geography, and more.

With five unique games and new puzzles every day, Spark makes learning part of your routine. Each game offers a different way to explore the day's theme, and each one teaches you as you play.
 Spark's games include: This or That: Choose between two options to learn more about the day's theme Links: Find the common thread connecting people, places, and ideas Chrono: Put events in order to see how history really unfolded Knockout: Uncover surprising comparisons in a series of fun head-to-head matchups Hindsight: Pinpoint when and where a photo was taken to uncover the story behind it
 All of Spark's puzzles are crafted by experts, not AI, and designed to spark those "aha" moments that make ideas stick. Explore hundreds of topics in the Library, from ancient history to the animal kingdom, with past themes to revisit anytime. Along the way, you'll uncover facts that are fun to learn and even better to share.
 From the creators of Elevate and Balance, Spark is part of a collection of mental fitness apps designed to strengthen your mind. For additional information, please read our Terms of Service (https://themindcompany.com/terms-and-conditions?from=spark) and Privacy Policy (https://themindcompany.com/privacy-policy?from=spark).

Screenshots

memoryOS4 screens
Spark4 screens

Verdict

The call

The clearest difference is ads: memoryOS at none against Spark's shown. memoryOS also leads on ratings volume (16K vs 2.7K) and chart position (#57 vs #175). Spark's advantage is update cadence (weekly vs every 3 weeks) and review sentiment (93% 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 20 in-app purchases, starting at $3.99 per 7 days and Spark sells 10 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

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 Spark. That said, the two scores are not equally well evidenced: memoryOS has 16K ratings behind it against 2.7K, 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 93% of Spark's.

UpkeepUpdate frequency

memoryOS ships an update every 3 weeks, Spark weekly. Both last shipped on September 25, 2026.

Scorecard5 real differences · 6 level
memoryOS versus Spark: the parameters behind the verdict, then further details
ParametermemoryOSSpark
PriceFreeFree
Rating4.9 (16K ratings) — better4.8 (2.7K ratings)
Positive reviews80.4% of reviews92.7% of reviews — better
Number of ratings16K — better2.7K
Update frequencyEvery 3 weeksWeekly — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
Best chart rank#57 — better#175
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.2 — better16.0
Further details — not scored
Size248 MB145 MB
Age rating4+4+
DeveloperEncoder Inc.The Mind Company

Customer experience

memoryOS

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

Spark

All ratings2,713 ratings
Positive95.1%
Neutral1.4%
Negative3.5%
Written reviews1,626 reviews
Positive92.7%
Neutral2.4%
Negative4.9%

User reviews

memoryOS

From 16K App Store ratings

What we love

  • 🚀 Effective memory techniques
  • 👍 Interactive and engaging
  • 💡 Innovative use of memory palaces
  • 🤩 Impressive results in a short time
  • 🎉 Fun and enjoyable to use

Room to improve

  • 💰 Expensive subscription model
  • 🐛 Buggy and crashes frequently
  • 🤔 Confusing navigation and UI
  • 🔒 Lack of transparency around pricing
  • 🙄 Aggressive upselling and marketing tactics

Spark

From 2.7K App Store ratings

What we love

  • 🚀 Fun and free way to fight brainrot
  • 👍 Engaging and educational puzzles
  • 💡 Innovative and interesting themes
  • 👍 Clean visuals and smooth design
  • 👍 Balanced challenge and learning

Room to improve

  • 🐛 Potential inaccurate information in puzzles

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

Spark

Reported bugs

1 issue
  • AT&T blocking the website as potentially malicious

Requested features

2 requests
  • More games and puzzles
  • Dark mode option

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
10 purchases

Spark

Subscriptions10
  • Spark Plus$2.991 Month
  • Spark Plus$4.991 Month
  • Spark+$9.991 Month
Show 7 more
  • Spark+1 Year trial$39.991 Year
  • Spark Plus1 Year trial4 variants$39.991 Year
  • Spark Plus7 Days trial$39.991 Year
  • Spark Plus3 Days trial$39.991 Year
  • Spark+7 Days trial$59.991 Year
  • Spark+1 Year trial$59.991 Year
  • Spark+7 Days trial$79.991 Year

Questions

Is memoryOS free?
memoryOS is free to download, with in-app purchases available.
Is Spark free?
Spark is free to download, with in-app purchases available.
Which has better reviews, memoryOS or Spark?
memoryOS is rated higher. memoryOS averages 4.9 out of 5 from 16K ratings, while Spark averages 4.8 from 2.7K ratings.
Do memoryOS or Spark have ads?
Spark shows ads; memoryOS does not.
Which is updated more often, memoryOS or Spark?
memoryOS ships an update every 3 weeks, and Spark weekly. Most recently, memoryOS was updated on September 25, 2026 and Spark on September 25, 2026.
Which is more popular, memoryOS or Spark?
memoryOS currently peaks at #57 in the App Store charts, and Spark at #175. Chart position reflects recent download velocity rather than total install base.

Other comparisons