Comparison

4 vs StudyGlen

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

Head to head
About

4

Features
Read full description

Control the animation speed from 0 to 33 frames per second. The framerate is precisely calculated to allow you to synchronize for filming (with the strobes on or off). You can change the strobe brightness - from zero to a maximum of 1ms in duration. One neat trick to really get maximum reactions from new observers is two switch the strobes on and off while the animation is running - instantly turning the animation into a spinning blur, or instantly turning a spinning blur into a magic solid animation. Just for fun the strobes are RGB so you can change the strobe colour with the colour buttons, and there is a "secret" disco mode triggered by the button combo of W,R,G,B. On the settings screen you can configure your 4-Mation to work with your local wifi, and you can set its name. There are also advanced settings to secure the app in kiosk mode for public display - and you can also configure 4-Mation to run an animation with the different number of frames, or to use a replacement motor with a different gear ratio. There's a detailed breakdown of the app features here: https://youtu.be/mMFHqckvUVc

About

StudyGlen

Features
Read full description

StudyGlen turns anything you're studying into smart flashcards and practice quizzes in seconds. Paste your notes, upload a PDF, snap a photo, or drop in a YouTube link, and StudyGlen's AI builds a complete deck for you. No more hours spent typing cards by hand. Then it helps you actually remember them. Using spaced repetition (the modern FSRS algorithm), StudyGlen shows each card right before you'd forget it, so revision sticks with less time and less cramming. When you want to check what you actually know, switch to Quizzes. The same AI turns your material into a practice quiz, with four question types to choose from: multiple choice, true or false, short answer, and fill in the blank. Every answer is marked instantly, with an explanation you can learn from. WHY IT WORKS • AI flashcard maker. Turn notes, PDFs, images, or YouTube videos into a ready-to-study deck instantly. • AI quiz maker. Build a practice test from the same material and find your weak spots before the exam does. • Spaced repetition that works. A smart SRS schedule plans every review for you. • On track for exam day. Set your exam date and StudyGlen paces the deck so it's fresh on the day. • Instant feedback. Every quiz answer is marked as you go, with an explanation. • Coming from Anki? Import your .apkg decks and keep your review progress. • Study anywhere. Review on the go, and your decks and progress sync across devices. • Visual cards. Built-in images make tough concepts easier to recall. • Simple to start. Get studying in under a minute. PERFECT FOR • Students prepping for exams, tests, quizzes, and finals • Medical, law, and language learners with a lot to memorize • Anyone who wants a faster, smarter alternative to expensive flashcard apps Stop studying the slow way. Let StudyGlen build your flashcards and quizzes, schedule every review, and help you remember everything you study, free.

Screenshots

41 screens
StudyGlen4 screens

Verdict

The call

The clearest difference is in-app purchases: 4 at none against StudyGlen's 3. 4 also leads on device support (3 vs 1) and iOS requirement (12.0 vs 16.4). On price, update cadence and ads there is nothing between them.

Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS

CostPrice Ā· In-app purchases Ā· Ads Ā· Monetization

Both are free to download. StudyGlen sells 3 one-off in-app purchases. 4 asks for nothing beyond the download.

UpkeepUpdate frequency

4 ships an update every 4 days, StudyGlen every 6 days. The most recent releases landed on October 6, 2026 and October 24, 2026 respectively.

Scorecard3 real differences Ā· 3 level
4 versus StudyGlen: the parameters behind the verdict, then further details
Parameter4StudyGlen
PriceFreeFree
Update frequencyEvery 4 days — betterEvery 6 days
AdsNoNo
In-app purchasesNo — betterYes
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS12.0 — better16.4
Further details — not scored
Size8 MB65 MB
Age rating4+4+
DeveloperKevin HolmesTuncay Technologies LTD

In-app purchases

None

4

No in-app purchases

3 purchases

StudyGlen

One-time3
  • Starter Pack$11.99
  • Plus Pack$29.99
  • Pro Pack$59.99

Questions

Is 4 free?
4 is free to download, with no in-app purchases.
Is StudyGlen free?
StudyGlen is free to download, with in-app purchases available.
Do 4 or StudyGlen have ads?
Neither 4 nor StudyGlen shows ads.
Which is updated more often, 4 or StudyGlen?
4 ships an update every 4 days, and StudyGlen every 6 days. Most recently, 4 was updated on October 6, 2026 and StudyGlen on October 24, 2026.

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