memoryOS vs Kinnu
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Interactive bite-sized lessons
- Virtual Mind Palaces game
- Spaced repetition system
- Scientifically proven techniques
- Improve knowledge retention
- Memorize diverse information
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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
Kinnu
This app offers bite-sized learning content across a wide range of subjects, from psychology and science to history and technology. It utilizes cognitive science and a unique "Memory Shield" technology to help users retain information effectively, making learning engaging and fun.
- Bite-sized, expert-edited content
- Memory Shield technology for retention
- Gamified learning sessions
- Community-driven content development
- Knowledge Bank progress tracking
- Interactive, adaptive questions
- Audio versions of content
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We built Kinnu to give everyone the power to learn anything they want to, whatever their goals. With Kinnu you can: Follow your curiosity Become the most interesting person in the room Never forget what you’ve learned with our Memory Shield technology Find a cure to doomscrolling on social media Our microlearning app harnesses cognitive science to help you build lasting knowledge across many domains. It’s the product of several years of research from experts in the science of learning. Popular courses: Psychology: Mental Health, Positive Psychology, Superpower Learning, Cognitive Biases Lifeskills: Personal Finance, Persuasion, Communications Health: Science of Sleep, Science of Exercise, Healthy Habits Science: Laws of Physics, Fungi, Astronomy, Quantum Physics, Chemistry, Zoology History: World History, Ancient Civilizations, Near Modern Civilizations, Rome Technology: Artificial Intelligence, Generative AI, Cybersecurity, Data Science Literature: Poetry, Folklore, 10 Great Novels, Shakespeare Absolutely Random: Dinosaurs, Greek Mythology, Secret Societies and Cults, Video Games Product features: Bite-sized, expert edited content Memory Shield technology – a new method to never forget what you’ve learned Highly addictive gamified learning sessions Community votes on where to take the app next Track your progress and watch your mind grow with the Knowledge Bank Super clean design that makes daily learning a joy Map based design to explore content and conquer new areas Interactive, adaptive questions and games to refresh and retain your knowledge. Audio version of all content to learn on the go What our users say about us: “Literally feel myself getting smarter using this app… the questions wire stuff to my brain when I do the smart session every day.” “Learning has never been this fun. Engaging, interesting, diverse. Kinnu has it all.” “Fun, easy to use. Super fun to have short little bites of education on tons of interesting topics.” “It’s amazing, and it’s enhancing my life.” Do you have an idea about how we could make our app and its content even better? Email us at support@kinnu.xyz - we listen, and we hear you. SUBSCRIPTION This app contains an optional in-app subscription. Payment will be charged to your iTunes Account at confirmation of purchase. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Manage subscriptions in your App Store account settings. By using this app, you agree to the Kinnu Terms of Use: https://kinnu.xyz/terms Privacy Notice: https://kinnu.xyz/privacy Email: support@kinnu.xyz
Screenshots
Verdict
The clearest difference is ratings volume: memoryOS at 16K against Kinnu's 494. memoryOS also leads on chart position (#47 vs unranked) and iOS requirement (15.2 vs 17.0). Kinnu's advantage is update cadence (every 6 days vs every 3 weeks). On price, rating, review sentiment 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
Both are free to download. memoryOS sells 20 in-app purchases, starting at $3.99 per 7 days and Kinnu sells 4 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.
On the App Store both sit at effectively the same score — 4.9 for memoryOS against 4.8 for Kinnu. That said, the two scores are not equally well evidenced: memoryOS has 16K ratings behind it against 494, 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 87% of Kinnu's.
memoryOS ships an update every 3 weeks, Kinnu every 6 days. The most recent releases landed on September 24, 2026 and September 22, 2026 respectively.
| Parameter | memoryOS | Kinnu |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (16K ratings) — better | 4.8 (494 ratings) |
| Positive reviews | 80.4% of reviews | 87.3% of reviews — better |
| Number of ratings | 16K — better | 494 |
| Update frequency | Every 3 weeks | Every 6 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | #47 — better | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.2 — better | 17.0 |
| Further details — not scored | ||
| Size | 248 MB | 101 MB |
| Age rating | 4+ | 12+ |
| Developer | Encoder Inc. | Kinnu Limited |
Customer experience
memoryOS
Kinnu
User reviews
memoryOS
From 16K App Store ratingsWhat 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
Kinnu
From 494 App Store ratingsWhat we love
- 👍 Engaging learning experience
- 🚀 Efficient micro-learning format
- 🔒 No ads or subscriptions
- 💡 Wide range of interesting topics
- 👍 Gamified learning approach
Room to improve
- 🐛 Occasional bugs and crashes
- 🐛 Syncing and progress issues
- 🐛 Inaccurate or incomplete information
- 🐛 AI-generated content quality concerns
- 🐛 Inability to contact developers
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
Kinnu
Reported bugs
4 issues- Frequent app crashes
- Progress and data loss issues
- Syncing problems
- Compatibility issues with older devices
Requested features
5 requests- Ability to highlight or take notes
- More in-depth content and sources
- Customization options (e.g., dark mode)
- Ability to connect with others
- Improved notification and reminder system
In-app purchases
memoryOS
- Student Weekly Plan$3.997 Days
- Student Monthly Plan7 Days trial$4.991 Month
- Expert Weekly Plan7 Days trial$6.997 Days
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- 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
- 10 Hearts$0.99
- 10 Loci Coins$2.99
- 50 Loci Coins$14.99
Kinnu
- Monthly$1.991 Month
- Kinnu Certificate$7.99
- Kinnu Certificate$14.99
- Kinnu Certificate$19.99








