Independent automated assessment · 3 signal sources · 543 reviews scanned · analyzed 2026-10-05.
4.9 ★16,543 ratings
—Downloads
4+Age rating
260 MBApp size
FreeIn-app purchases
About this app
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.…
Preview
Real screenshots from the store listing.
Independent evidence report
The evidence behind this assessment
This is where the page changes from an app-store listing into an evidence report: findings, important reviews, pricing and a dated history.
Which version this describes
When we ran this analysis, and what the store lists now.
This analysis describes version 1.5.9 of the app, analyzed 2026-10-05 . The app may have changed since.
The store currently lists version 1.6.0, updated 2026-10-03.
The app has been updated since this analysis. The findings on this page describe version 1.5.9, not the version now listed on the store.
Release notes for the newer versions, in the developer’s own words:
Version 1.6.0 · 2026-10-03
Thank you for your continued feedback! We are dedicated to making mOS the best experience possible for you. In this update, we've focused on user experience and performance: Smoother Palaces We've resolved freezing issues that occurred while exploring 3D Palaces for a seamless, uninterrupted experience. Full Video Transcript You can now access the complete transcript of any video — follow along, review key points, or read at your own pace. Refreshed Pre & Post-test Experience We've updated the completion screens for both Pre and Post-tests, along with a cleaner Result Comparison view to better highlight your progress between the two. Under the Hood We've fixed several bugs and improved…
Shortened here; the full notes are on the store listing.
What we measured
Each line is a measurement published as a measurement, never a verdict.
Each line is a measurement, published as a measurement. Where we have not looked, the line says so rather than reading as a zero.
Developer replies to reviews
Replies to fewer than 1 review in 20
Price in the store description
States a price and a billing period
Cancelling, in the store description
Says how to cancel
Themes reported by reviewers
No theme reported
Counted from the reviews we have read for this app. "No theme reported" means no theme reached our reporting threshold — it is not a finding that nothing is wrong with this app, and we do not say it is.
Five-star share of ratings
90% or more five-star
Arithmetic on the stores' own published rating counts. It says nothing about why the ratings fall where they do.
In the package we scanned
No package has been scanned for this app, so nothing is published about what it ships. That is an absence of evidence about the app, not a finding about it.
Graded bands · predicate set 1.4 · how these are measured
What the analysis found
App-specific findings, grouped by what each one rests on. How they are graded lives on its own page.
Context 1
Measured and published because a reader would want to know — deliberately not a charge. The measurement alone does not show a harm.
Cheapest and priciest options are far apart
The disclosed in-app purchases span an unusually wide price range. Published as context: the cheapest and priciest items may be different kinds of product entirely, so the spread alone deducts nothing.
What we saw: In-app purchases run from USD 5.99 to USD 174.99 — a 29x spread across 10 items
Assessment & version history
App changes and Appworthy events in one timeline.
What this app sells
Useful store-disclosed pricing, kept below the app listing.
Business modelFree
Prices and terms as disclosed by the store listing.