Comparison

Knowt vs Aperture

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Knowt

This study app uses AI to transform notes and lecture videos into flashcards and practice tests. It offers various study modes, including spaced repetition, and provides free AP exam study guides. Millions of student-created resources are available.

Highlights
  • AI flashcard maker
  • Summarize lecture videos
  • Create practice tests from notes/PDFs/videos
  • Free Learn Mode with multiple study modes
  • Spaced Repetition algorithm
  • Free AP Study Guides
  • Sync across mobile and web
Features
Read full description

Discover a new way to study with Knowt, the all-in-one study app trusted by 7 million students. On top of being the #1 Flashcard App with Free Learn mode, Knowt also has unique AI features designed to save you time when studying. With one click, turn your notes into flashcards, or ask our AI to summarize your lecture videos and whip up flashcards on the key info for you. Knowt creates practice tests from any note, pdf, or video to help you prepare for exams. We offer a more efficient way to study, join us and take your learning to the next level with Knowt. What can you do on Knowt? Make flashcards sets: Use our AI flashcard maker to create your own set or grab some from popular sites like Quizlet. Turn your notes into flashcards and practice : Upload your notes and let our AI makes flashcards and practice tests to help you learn the material better. Study with Free Learn Mode : Master your flashcards with unlimited rounds of learn mode or one of our other study modes (Practice Test, Match, Spaced Repetition) Efficient note-taking: Use our AI note-taking feature to take notes faster Spaced Repetition : Nail your tests with our scientifically proven algorithm that helps you remember your flashcards longer Free AP Study Guides : Check out the Exams Tab for free AP exam study guides, flashcards, and practice tests. (We're adding more exams soon!) Explore Free Learning Resources: Choose from millions of digital flashcard sets, class notes, study guides, and pdfs on a wide range of subjects, all created by fellow students. Seamless Sync: All your stuff syncs between the mobile app and website, making it easy to pick up where you left off, regardless of the device you're using. --------- Download the new Knowt App today and take your notes & flashcards wherever you go. Improve your grades and unleash the power of AI to learn better & faster. Terms of Service : https://knowt.com/terms Privacy Policy : https://knowt.com/privacy --------------------------- Join the Knowt Community! Discord: https://knowt.com/discord TikTok: https://www.tiktok.com/@getknowt Instagram: https://www.instagram.com/getknowt --------------------------- We are committed to protecting your personal information and your right to privacy. If you have any questions or concerns about our practices with regard to your personal information, please contact us at contact@knowt.com

About

Aperture

Features
Read full description

Most practice journals can only ever agree with you. Aperture is built so it can tell you nothing happened. It hides the target, seals what you recorded before you can revise it, and scores your impressions against what was actually in the photo. You don't have to wonder whether you're improving. You can look. A SESSION, STAGE BY STAGE - Cool-down: a short breathing pacer to quiet the analytic mind - Ideogram: a fast reflexive mark, then tag the basic gestalt - Sensory: colors, textures, temperatures, sounds, forms - Sketch: the spatial layout, on a full canvas - Assemble: your final impressions, before you commit - Reveal: only now does the target appear, and the scoring begin Until you commit, the target is never shown, hinted at, or inferable. You work from a meaningless reference number. YOUR GUT, KEPT SEPARATE FROM YOUR GUESSES Raw sensory impressions stay visually separate from flagged guesses (AOL: the mind's premature conclusions). Flagging a guess never costs you points. That separation is the habit the whole method is built on. SCORING YOU CANNOT FUDGE Your score is how much of what you sensed matches what was really there, judged against a fixed vocabulary set in advance rather than your memory of what you meant. It rewards accurate sensory data, not lucky label-guessing, and shows you which impressions matched and which missed. Log enough sessions and it will tell you plainly whether you are beating chance. A REFEREE, NOT AN ORACLE (SUPPORTED IPHONES) An optional AI judge reads the session you already sealed and scores it against the target. It can lower a generous score but never inflate one, and it never tells you what you will perceive next time. NOTHING LEAVES YOUR IPHONE No account, no analytics, no server of ours. Your sessions live on your device. Optional Pro sync goes only through your own private iCloud, and the judge runs on-device, so nothing you write is sent anywhere for analysis. FREE TO TRY, PROPERLY Your first 3 sessions are complete and full-featured: the whole protocol, the full target pool, real scoring. Aperture Pro then unlocks: - Unlimited sessions - The full 300+ target library - Analytics that show your results against chance - Unlimited named viewers with separate histories - Relay mode: two people, one hidden target, revealed together - Session export (JSON) Aperture Pro is $6.99/month, or $39.99/year with 1 month free, or a one-time lifetime purchase. Subscriptions renew automatically unless cancelled. Aperture builds on Controlled Remote Viewing, the six-stage protocol developed at SRI in the 1970s and the subject of declassified government research. It makes no claims about psychic ability and predicts nothing. It is a practice journal and an attention-training tool. Test yourself, collect your own data, draw your own conclusions. Privacy policy: https://quietoptics.com/aperture/privacy.html Terms of use: https://quietoptics.com/aperture/terms.html

Screenshots

Knowt4 screens
Aperture4 screens

Verdict

The call

The clearest difference is chart position: Knowt at #114 against Aperture's unranked. On price, update cadence, ads and in-app purchases 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. Knowt sells 27 in-app purchases, starting at $5.99 per month and Aperture sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Knowt ships an update weekly, Aperture every 4 days. The most recent releases landed on October 24, 2026 and October 16, 2026 respectively.

Scorecard1 real difference · 10 level
Knowt versus Aperture: the parameters behind the verdict, then further details
ParameterKnowtAperture
PriceFreeFree
Rating4.7 (11K ratings) — better—
Positive reviews61.9% of reviews—
Number of ratings11K — better—
Update frequencyWeeklyEvery 4 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
Best chart rank#114 — better—
DevicesiPhone, iPadiPhone, iPad
Requires iOS16.4 — better17.0
Further details — not scored
Size150 MB57 MB
Age rating4+4+
DeveloperKnowt Inc.Quiet Optics LLC

Bugs and requests

Knowt

Reported bugs

4 issues
  • Flashcards disappearing or duplicating
  • Incorrect answers marked as correct
  • Freezing on update screen
  • Compatibility issues on certain devices

Requested features

6 requests
  • Split screen support for iPad
  • Ability to manually sort flashcards
  • More formatting options for flashcards
  • Improved AI-generated notes
  • Offline study mode
Show 1 more
  • Customizable audio/visual feedback

Aperture

Not enough reviews yet to summarise bugs or requests.

In-app purchases

27 purchases

Knowt

Subscriptions27
  • Student Plus Monthly3 Days trial$5.991 Month
  • Student Plus Monthly3 Days trial$7.991 Month
  • Teacher Plus Monthly7 Days trial$7.991 Month
Show 24 more
  • Student Ultra Weekly$9.997 Days
  • Student Ultra Monthly3 Days trial$12.991 Month
  • Teacher Ultra Monthly7 Days trial$12.991 Month
  • Student Ultra Monthly3 Days trial$14.991 Month
  • Teacher Ultra Monthly7 Days trial$14.991 Month
  • Student Ultra Monthly3 Days trial2 variants$19.991 Month
  • Student Ultra Monthly7 Days trial$19.991 Month
  • Student Ultra Monthly$19.991 Month
  • Teacher Ultra Monthly3 Days trial$19.991 Month
  • Student Plus Annual3 Days trial$23.991 Year
  • Student Ultra Monthly$24.991 Month
  • Teacher Plus Annual7 Days trial$35.991 Year
  • Teacher Ultra Annual7 Days trial$47.991 Year
  • Student Ultra Annual3 Days trial2 variants$59.991 Year
  • Teacher Ultra Annual$59.991 Year
  • Student Ultra Annual3 Days trial2 variants$95.991 Year
  • Teacher Ultra Annual7 Days trial$95.991 Year
  • Student Ultra Annual3 Days trial2 variants$119.991 Year
  • Student Ultra Annual$119.991 Year
  • Student Ultra Annual7 Days trial$119.991 Year
  • Student Ultra Annual14 Days trial$119.991 Year
  • Teacher Ultra Annual3 Days trial$119.991 Year
  • Student Ultra Annual7 Days trial$149.991 Year
  • Student ultra annual3 Days trial$149.991 Year
3 purchases

Aperture

Subscriptions2
  • Aperture Pro — Monthly$4.991 Month
  • Aperture Pro — Annual1 Month trial$29.991 Year
One-time1
  • Aperture Pro — Lifetime$59.99

Questions

Is Knowt free?
Knowt is free to download, with in-app purchases available.
Is Aperture free?
Aperture is free to download, with in-app purchases available.
Do Knowt or Aperture have ads?
Neither Knowt nor Aperture shows ads.
Which is updated more often, Knowt or Aperture?
Knowt ships an update weekly, and Aperture every 4 days. Most recently, Knowt was updated on October 24, 2026 and Aperture on October 16, 2026.

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