Comparison

memoryOS vs Natasha's Fluency Fix

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

Natasha's Fluency Fix

Features
Read full description

Your English is good. It should feel natural. You know what you want to say. In your own language, you would explain it clearly, hold the room, tell the story, respond to the unexpected question. But in English, something changes. The conversation moves quickly. You start translating, constructing the sentence instead of saying it. You simplify an idea you could explain perfectly in your own language. Or the moment passes before you've said what you actually meant. Natasha's Fluency Fix is built for that gap. FLUENCY THAT FEELS NATURAL — NOT TRANSLATED Fluency Fix is for people who already speak English but want to use it more naturally under real conditions. Not grammar labels or disconnected exercises — language built around what you are trying to say, in the situations where you need to say it. What happened? What changed? What matters now? What does the other person need to understand? You build the language around the communication. So English becomes something you reach for naturally, not something you have to construct. START WITH YOUR FLUENCY PROFILE Your programme begins with an AI-guided spoken assessment. You speak — the conversation adapts and explores how you currently communicate and what you want your English to do. Your personalised Fluency Profile shows your strengths, your development priorities, and the communication goals that matter most to you. YOUR PROGRAMME IS MATCHED TO YOU Based on your profile, you follow one of three tracks: Business Professional Fluency — for professionals who work in English but want more ease, precision and confidence in meetings, presentations and business conversations. Confident Everyday English — for people whose English works but doesn't feel natural in travel, social situations and spontaneous conversation. Executive Leadership English — for senior professionals whose English is competent but whose spoken authority doesn't yet fully reflect their expertise or role. LANGUAGE IN CONTEXT Each session brings together audio and video coaching, speaking practice, structured activities, flashcards, and Companion Readers — stories that place the language you're developing inside real professional and everyday situations. You encounter the same language across different formats and contexts. It becomes something you recognise, then understand, then reach for without thinking. BUILT AROUND REAL COMMUNICATION Fluency Fix grew from live coaching with international professionals and one consistent observation: knowing more English is rarely the answer. The next step is usually doing more with the English you already have. Explain a complicated idea without losing yourself halfway through. Respond when you haven't rehearsed the answer. Contribute while the conversation is still happening. Sound as capable in English as you actually are. WANT PERSONALISED SUPPORT? When you want direct feedback or help with a specific communication challenge, you can book a live 1:1 session with Natasha from the app. This isn't about perfect English. It's about having access to your thinking and your voice — when you're speaking it. Your English is already good. Now make it feel natural. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

memoryOS4 screens
Natasha's Fluency Fix4 screens

Verdict

The call

The clearest difference is update cadence: Natasha's Fluency Fix at every 3 days against memoryOS's every 2 weeks. memoryOS's advantage is chart position (#63 vs unranked). On price, ads, in-app purchases 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 23 in-app purchases, starting at $3.99 per 7 days and Natasha's Fluency Fix sells 10 in-app purchases, starting at $24.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

memoryOS ships an update every 2 weeks, Natasha's Fluency Fix every 3 days. The most recent releases landed on October 29, 2026 and October 25, 2026 respectively.

Scorecard2 real differences · 9 level
memoryOS versus Natasha's Fluency Fix: the parameters behind the verdict, then further details
ParametermemoryOSNatasha's Fluency Fix
PriceFreeFree
Rating4.9 (17K ratings) — better—
Positive reviews80.3% of reviews—
Number of ratings17K — better—
Update frequencyEvery 2 weeksEvery 3 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
Best chart rank#63 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.215.1 — better
Further details — not scored
Size231 MB48 MB
Age rating4+4+
DeveloperEncoder Inc.Natasha Stephens

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

Natasha's Fluency Fix

Not enough reviews yet to summarise bugs or requests.

In-app purchases

23 purchases

memoryOS

Subscriptions20
  • Student Weekly Plan$3.997 Days
  • Student Monthly Plan7 Days trial$5.991 Month
  • Expert Weekly Plan7 Days trial$6.997 Days
Show 17 more
  • Essential Weekly Plan7 Days trial$6.997 Days
  • Essential Monthly Plan7 Days trial$14.991 Month
  • Essential Monthly Plan2 variants$14.991 Month
  • Essential Monthly Plan$16.991 Month
  • Student 3 Months Plan$19.993 Months
  • Expert Monthly Plan$24.991 Month
  • Expert Monthly Plan$29.991 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 Plan1 Month trial$149.991 Year
  • Expert Annual Plan7 Days trial$174.991 Year
  • Expert Annual Plan1 Month trial$174.991 Year
One-time3
  • 10 Hearts$0.99
  • 10 Loci Coins$2.99
  • 50 Loci Coins$14.99
10 purchases

Natasha's Fluency Fix

Subscriptions8
  • Out & About English$24.991 Month
  • Confident Everyday English$24.991 Month
  • Business Professional Fluency$24.991 Month
Show 5 more
  • Executive Leadership English$24.991 Month
  • Out & About English$249.991 Year
  • Business Professional Fluency$249.991 Year
  • Confident Everyday English$249.991 Year
  • Executive Leadership English$249.991 Year
One-time2
  • Hermann's Journey Companion Reader$11.99
  • Elena at the Edge Companion Reader$11.99

Questions

Is memoryOS free?
memoryOS is free to download, with in-app purchases available.
Is Natasha's Fluency Fix free?
Natasha's Fluency Fix is free to download, with in-app purchases available.
Do memoryOS or Natasha's Fluency Fix have ads?
Neither memoryOS nor Natasha's Fluency Fix shows ads.
Which is updated more often, memoryOS or Natasha's Fluency Fix?
memoryOS ships an update every 2 weeks, and Natasha's Fluency Fix every 3 days. Most recently, memoryOS was updated on October 29, 2026 and Natasha's Fluency Fix on October 25, 2026.

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