Comparison

UltraMemory Spaced Repetition vs Unfog

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

Head to head
About

UltraMemory Spaced Repetition

Features
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Flashcards that get harder as you get better. You already know spaced repetition works. You've built the habit, done the reviews โ€” and still drawn a blank when it mattered. The problem isn't you. It's the prompt. Traditional flashcard tools ask the same question every time. After enough repetitions, you're not recalling โ€” you're pattern-matching. The knowledge stays brittle. ultramemory fixes this. Each card evolves through five stages โ€” recognition, application, production, transfer, and synthesis. The question gets harder as your recall matures. Once two concepts are truly owned, the system finds the connection between them and asks the question that bridges them. That's where real mastery is built. Capture is one tap. The AI handles the prompt, the stage, the schedule. You just show up. No streaks. No guilt trips. No gamification. When you miss a day, the queue waits โ€” honestly, without comment. Progress is shown, not celebrated. ultramemory is for: - Power users who find Anki too rigid - Non-native speakers who need words truly retrievable, not just familiar - Serious readers tired of losing a book three weeks after finishing it - Professionals who rely on frameworks and have felt the embarrassment of not retrieving one in the room A tool for the mind that compounds for years. https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Unfog

Features
Read full description

Stop rereading the same chapter and hoping it sticks. Unfog turns lectures, PDFs, and videos into real understanding โ€” you explain in your own words, and the app shows exactly what still needs work. The Feynman method, built for your phone: add material, explain it simply (as if to a friend), get honest feedback on gaps, then revise with quizzes, flashcards, and mind maps. WHAT YOU GET โ–ธ Learn by explaining โ€” voice or typed answers โ–ธ Honest gap feedback โ€” strengths and weak spots, so revision stays focused โ–ธ Smart notes โ€” clear summaries from your source material โ–ธ Quizzes and flashcards โ€” generated from your topic, in your language โ–ธ Mind maps โ€” see how ideas connect at a glance โ–ธ Many sources, one place โ€” PDFs, scans, recordings, YouTube, links, pasted text โ–ธ Shared study spaces โ€” revise with others, like a group session before exams โ–ธ Built for real sessions โ€” mobile-first, dark mode, English and Polish HOW IT WORKS 1. Add material โ€” a chapter, lecture, or lesson 2. Read smart notes to get oriented 3. Explain it simply, as if to a friend 4. Identify gaps and retry until it sticks 5. Revise with quizzes, flashcards, and mind maps Whether you are preparing for exams, learning a new skill, or revising after a meeting, the loop stays simple: capture โ†’ explain โ†’ fix gaps โ†’ revise. Unfog Pro unlocks full access to study features. Download Unfog and find out whether you truly understand what you just read. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

UltraMemory Spaced Repetition4 screens
Unfog4 screens

Verdict

The call

The clearest difference is device support: UltraMemory Spaced Repetition at 3 against Unfog's 1. UltraMemory Spaced Repetition also leads on iOS requirement (15.1 vs 17.0). On price, update cadence, ads and in-app purchases there is nothing between them.

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. UltraMemory Spaced Repetition sells 2 in-app purchases, starting at $12.99 per month and Unfog sells 3 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

UltraMemory Spaced Repetition ships an update every 4 days, Unfog every 2 days. The most recent releases landed on October 28, 2026 and October 25, 2026 respectively.

Scorecard2 real differences ยท 4 level
UltraMemory Spaced Repetition versus Unfog: the parameters behind the verdict, then further details
ParameterUltraMemory Spaced RepetitionUnfog
PriceFreeFree
Update frequencyEvery 4 daysEvery 2 days โ€” better
AdsNoNo
In-app purchasesYesYes
DevicesiPhone, iPad, iPod โ€” betteriPhone
Requires iOS15.1 โ€” better17.0
Further details โ€” not scored
Size65 MB80 MB
Age rating4+4+
DeveloperJoel LoveraBITSEC SP. Z O.O.

In-app purchases

2 purchases

UltraMemory Spaced Repetition

Subscriptions2
  • Pro Monthly$12.991 Month
  • Pro$99.991 Year
3 purchases

Unfog

Subscriptions3
  • Unfog weekly$2.997 Days
  • Unfog Monthly1 Month trial$17.991 Month
  • Unfog Annual$29.991 Year

Questions

Is UltraMemory Spaced Repetition free?
UltraMemory Spaced Repetition is free to download, with in-app purchases available.
Is Unfog free?
Unfog is free to download, with in-app purchases available.
Do UltraMemory Spaced Repetition or Unfog have ads?
Neither UltraMemory Spaced Repetition nor Unfog shows ads.
Which is updated more often, UltraMemory Spaced Repetition or Unfog?
UltraMemory Spaced Repetition ships an update every 4 days, and Unfog every 2 days. Most recently, UltraMemory Spaced Repetition was updated on October 28, 2026 and Unfog on October 25, 2026.

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