Comparison

memoryOS vs Rabbit Hole AI

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

Rabbit Hole AI

This AI-powered learning app offers daily trivia, infinite knowledge exploration across various subjects, and global leaderboards. It's designed to challenge your mind and expand your understanding of science, history, AI, and more through interactive content and personalized recommendations.

Highlights
  • Daily trivia challenges
  • Infinite topic exploration
  • AI-powered recommendations
  • Global leaderboards
  • Daily updated content
  • Interactive learning design
Features
Read full description

Rabbit Hole: AI Learning App with Daily Trivia, Infinite Knowledge, and Global Leaderboards Unlock Endless Knowledge & Challenge Your Brain with Daily Trivia! Rabbit Hole is the ultimate AI-powered learning app designed for curious minds who love exploring science, technology, AI, world news, history, art, and more. With fresh, daily content and interactive topic exploration, you’ll uncover hidden connections and expand your knowledge effortlessly. NEW: Daily Trivia Challenge • Answer Infinite Daily Trivia Questions: Test your knowledge every day. • Compete on the Global Leaderboard: Battle against players worldwide for the #1 spot. • Sharpen Your Mind Daily: Stay sharp with fun, brain-boosting challenges. Key Features: • Explore Endless Topics: Dive into science, AI, history, world news, and more. • AI-Powered Recommendations: Personalized learning paths just for you. • Daily Updated Content: Stay informed with fresh discoveries every day. • Infinite Daily Trivia: Answer as many questions as you can, anytime. • Global Leaderboard: See how you stack up against the world. • Interactive & Intuitive Design: Built for learners of all ages. Whether you’re a student, lifelong learner, trivia lover, or just someone who enjoys fun, bite-sized knowledge sessions, Rabbit Hole combines AI learning and competitive trivia gaming into one seamless experience. Why Choose Rabbit Hole? • SEO-optimized learning topics: Science, technology, AI, history, art, and world news. • Daily Trivia for Mental Fitness: A fun way to boost your brainpower. • Stay Informed & Entertained: Knowledge and fun, hand-in-hand. Join thousands of curious minds and start your journey of discovery and trivia mastery today! Download Rabbit Hole now and become a global trivia champion while learning something new every day!

Screenshots

memoryOS4 screens
Rabbit Hole AI4 screens

Verdict

The call

The clearest difference is in-app purchases: Rabbit Hole AI at none against memoryOS's 10. Rabbit Hole AI also leads on iOS requirement (13.0 vs 15.2). memoryOS's advantage is ratings volume (17K vs 1) and update cadence (fortnightly vs every 5 weeks). On price, rating, ads 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. Rabbit Hole AI 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 5.0 for Rabbit Hole AI. That said, the two scores are not equally well evidenced: memoryOS has 17K ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

memoryOS ships an update fortnightly, Rabbit Hole AI every 5 weeks. The most recent releases landed on November 6, 2026 and October 30, 2026 respectively.

Scorecard6 real differences · 5 level
memoryOS versus Rabbit Hole AI: the parameters behind the verdict, then further details
ParametermemoryOSRabbit Hole AI
PriceFreeFree
Rating4.9 (17K ratings)5.0 (1 ratings) — better
Positive reviews80.3% of reviews—
Number of ratings17K — better1
Update frequencyFortnightly — betterEvery 5 weeks
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
Best chart rank#67 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.213.0 — better
Further details — not scored
Size232 MB26 MB
Age rating4+4+
DeveloperEncoder Inc.Manan Bhalodia

Customer experience

memoryOS

All ratings17,203 ratings
Positive97.2%
Neutral1.0%
Negative1.8%
Written reviews1,709 reviews
Positive80.3%
Neutral4.9%
Negative14.8%

Rabbit Hole AI

All ratings1 ratings
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

Rabbit Hole AI

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
None

Rabbit Hole AI

No in-app purchases

Questions

Is memoryOS free?
memoryOS is free to download, with in-app purchases available.
Is Rabbit Hole AI free?
Rabbit Hole AI is free to download, with no in-app purchases.
Which has better reviews, memoryOS or Rabbit Hole AI?
Rabbit Hole AI is rated higher. memoryOS averages 4.9 out of 5 from 17K ratings, while Rabbit Hole AI averages 5.0 from 1 ratings.
Do memoryOS or Rabbit Hole AI have ads?
Neither memoryOS nor Rabbit Hole AI shows ads.
Which is updated more often, memoryOS or Rabbit Hole AI?
memoryOS ships an update fortnightly, and Rabbit Hole AI every 5 weeks. Most recently, memoryOS was updated on November 6, 2026 and Rabbit Hole AI on October 30, 2026.

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