Comparison

Cogni vs StudyDeck

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

Head to head
About

Cogni

This app uses AI to generate flashcards from various sources like PDFs, notes, and lecture recordings. It employs spaced repetition with the FSRS algorithm to optimize memorization and allows for Anki deck import. Study notes can be generated alongside cards, and a library of pre-made decks is available.

Highlights
  • AI flashcard generation
  • FSRS spaced repetition
  • Anki deck import
  • Integrated study notes
  • Offline study mode
  • Library of pre-made decks
Read full description

Cogni is a flashcard app with FSRS spaced repetition, AI flashcard generation and Anki deck import. Study on iPhone, iPad, Android and the web: your decks and progress sync through one account, and reviews work offline. MAKE FLASHCARDS WITH AI Upload a PDF, photograph your notes or textbook pages, upload a lecture recording, paste text or type a topic. Cogni drafts question-and-answer and cloze cards. You check the drafts and keep the ones you want. FSRS SPACED REPETITION Every card is scheduled with FSRS, the open-source algorithm that predicts when you are about to forget. After each answer, rate your recall (Again, Hard, Good or Easy) and see when the card comes back. Each day you review only what is due. IMPORT YOUR ANKI DECKS Save an .apkg file in Files, tap + in Cogni and choose “Import .apkg”. Cards, subdecks, cloze cards, images and audio come with it. Anki's review history stays in Anki: FSRS builds a new schedule from your answers in Cogni. NOTES NEXT TO YOUR CARDS Generate study notes together with your cards and read them in Cogni on the web, linked to the cards they produced. READY-MADE DECKS Browse a library of 5,000+ decks for languages, medicine, anatomy and more, add a deck and start studying. BUILT FOR - Medical, nursing and pre-med students - Language learners building vocabulary - Students preparing for exams - Anyone moving their decks from another flashcard app FREE TO START Create cards, import decks, sync and study up to 40 card reviews a day for free, and try one AI generation. Cogni Premium removes the daily review limit, adds text-to-speech and includes AI generation within your plan's allowance. Terms of Use: https://cogni.cards/terms/ Privacy Policy: https://cogni.cards/privacy/

About

StudyDeck

Transform notes, PDFs, or photos into AI-powered flashcards instantly. Offers seven study modes, including spaced repetition and practice tests, to help you learn smarter and ace exams. On-device AI ensures your study materials remain private.

Highlights
  • AI-powered flashcard generation
  • Import notes, PDFs, and photos
  • Seven distinct study modes
  • Spaced repetition (FSRS algorithm)
  • On-device AI for privacy
  • Progress tracking and analytics
  • Share decks with classmates
Features
Read full description

Turn any notes, PDFs, or photos into AI-powered flashcards in seconds. StudyDeck uses artificial intelligence to generate study cards automatically, so you spend less time creating and more time learning. SMART FLASHCARD CREATION - Paste text, import a PDF, or snap a photo - AI does the rest - Camera OCR scans handwritten or printed notes instantly - AI generates front/back cards, multiple choice questions, and true/false statements - Edit, customize, and organize cards into decks 7 STUDY MODES - Flashcards - classic swipe-to-study with flip animations - Multiple Choice - AI-generated answer options test real understanding - True/False - quick-fire statements to reinforce key facts - Written Response - type your answer and get AI-evaluated feedback - Audio Quiz - speak your answers and study hands-free on iPhone - Spaced Repetition - the FSRS algorithm schedules reviews at the optimal time - Practice Tests - timed mixed-format tests to simulate the real thing LEARN SMARTER WITH SPACED REPETITION StudyDeck uses FSRS v5, the most accurate spaced repetition algorithm available. It tracks what you know and what you don't, scheduling reviews right before you'd forget. No more wasting time on cards you've already mastered. AI THAT WORKS ON YOUR DEVICE StudyDeck uses Apple Intelligence for fast, private AI processing right on your iPhone. AI generation and speech recognition run on-device where supported, so your study materials stay private. BUILT FOR STUDENTS - Track your study progress with detailed analytics - See accuracy, mastered cards, and study streaks - Share decks with classmates - Dark mode and haptic feedback throughout - No ads FREE TO START Study with all 7 modes for free - up to 3 decks and 100 flashcards. Free accounts also include limited AI generation and import credits each month. Upgrade to Premium for unlimited access to everything. StudyDeck Premium: - Annual subscription with 7-day free trial - Lifetime access - one-time purchase - Unlimited decks and flashcards - Unlimited AI card generation - Unlimited PDF and photo imports - Unlimited practice tests and study guides - Free version: 3 decks, 100 flashcards, 5 AI generations, 5 PDF imports, 5 photo imports, 3 practice tests, and 3 study guides per month Privacy: StudyDeck processes everything on your device. On-device AI means your notes stay private. See our privacy policy for details. Privacy Policy: https://studydeck.net/privacy.html Terms of Use: https://studydeck.net/terms.html Questions? Visit our support page at https://studydeck.net/support.html

Screenshots

Cogni4 screens
StudyDeck4 screens

Verdict

The call

The clearest difference is review sentiment: StudyDeck at 100% against Cogni's 36%. Cogni's advantage is iOS requirement (16.4 vs 26.0). 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. Cogni sells 9 in-app purchases, starting at $4.99 per month and StudyDeck sells 2 in-app purchases, starting at $12.99 per year. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Cogni ships an update weekly, StudyDeck every 2 weeks. The most recent releases landed on November 11, 2026 and November 5, 2026 respectively.

Scorecard2 real differences · 8 level
Cogni versus StudyDeck: the parameters behind the verdict, then further details
ParameterCogniStudyDeck
PriceFreeFree
Rating4.7 (1.7K ratings) — better—
Positive reviews35.8% of reviews100.0% of reviews — better
Number of ratings1.7K — better—
Update frequencyWeekly — betterEvery 2 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFreemium
DevicesiPhone, iPadiPhone, iPad, Mac — better
Requires iOS16.4 — better26.0
Further details — not scored
Size76 MB13 MB
Age rating4+4+
DeveloperCOGNIFLY LTDFrederic Bacro

Customer experience

Cogni

All ratings1,690 ratings
Positive92.8%
Neutral2.7%
Negative4.4%
Written reviews201 reviews
Positive35.8%
Neutral17.4%
Negative46.8%

StudyDeck

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

Cogni

Reported bugs

2 issues
  • App no longer available after paying for annual subscription
  • Occasional crashes

Requested features

4 requests
  • Integrate ChatGPT or Claude for automatic card creation
  • Add sub-decks for larger decks that need more review
  • Improve algorithm for hard/again ratings to better target struggling cards
  • Add subsections for decks to study different sections separately

StudyDeck

Not enough reviews yet to summarise bugs or requests.

In-app purchases

9 purchases

Cogni

Subscriptions7
  • Premium Monthly$4.991 Month
  • Premium Monthly$7.991 Month
  • Premium Monthly$14.991 Month
Show 4 more
  • Premium Annual$19.991 Year
  • Premium Annual$24.991 Year
  • Premium Annual$29.991 Year
  • Premium Annual$49.991 Year
One-time2
  • Lifetime Premium$69.99
  • Premium Lifetime$99.99
2 purchases

StudyDeck

Subscriptions1
  • StudyDeck Premium Annual7 Days trial$12.991 Year
One-time1
  • Lifetime Pass$39.99

Questions

Is Cogni free?
Cogni is free to download, with in-app purchases available.
Is StudyDeck free?
StudyDeck is free to download, with in-app purchases available.
Do Cogni or StudyDeck have ads?
Neither Cogni nor StudyDeck shows ads.
Which is updated more often, Cogni or StudyDeck?
Cogni ships an update weekly, and StudyDeck every 2 weeks. Most recently, Cogni was updated on November 11, 2026 and StudyDeck on November 5, 2026.

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