Epi Tools vs Cogni
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Epi Tools
This app provides a suite of epidemiological calculation tools for disease frequency, association, and effect measures. It also includes sample size calculators, diagnostic test validation, and a comprehensive glossary of terms.
- Measures of disease frequency with confidence intervals
- Measures of association and effect
- Sample size calculators
- Diagnostic test validation
- Post-test probability estimation
- Random number generator
- Epidemiology glossary
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Functions include measures of disease frequency (including confidence intervals for prevalence, incidence risk and incidence rates), measures of association and measures of effect (from 2 × 2 table data), various sample size calculators, diagnostic test validation, estimation of the post-test probability of disease, a random number generator and a comprehensive epidemiology glossary.
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.
- AI flashcard generation
- FSRS spaced repetition
- Anki deck import
- Integrated study notes
- Offline study mode
- Library of pre-made decks
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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/
Screenshots
Verdict
The clearest difference is review sentiment: Epi Tools at 100% against Cogni's 36%. Epi Tools also leads on in-app purchases (none vs 9) and rating (5.0 vs 4.7). Cogni's advantage is update cadence (weekly vs every 2 months) and ratings volume (1.7K vs 1). On price, ads and device support 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
Both are free to download. Cogni sells 9 in-app purchases, starting at $4.99 per month. Epi Tools asks for nothing beyond the download.
Epi Tools holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Cogni has 1.7K ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 100% of Epi Tools's written reviews are positive against 36% of Cogni's.
Epi Tools ships an update every 2 months, Cogni weekly. The most recent releases landed on November 3, 2026 and November 12, 2026 respectively.
| Parameter | Epi Tools | Cogni |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | 4.7 (1.7K ratings) |
| Positive reviews | 100.0% of reviews — better | 35.8% of reviews |
| Number of ratings | 1 | 1.7K — better |
| Update frequency | Every 2 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Freemium |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 13.4 — better | 16.4 |
| Further details — not scored | ||
| Size | 19 MB | 76 MB |
| Age rating | 12+ | 4+ |
| Developer | Mark Stevenson | COGNIFLY LTD |
Customer experience
Epi Tools
Cogni
Bugs and requests
Epi Tools
Not enough reviews yet to summarise bugs or 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
In-app purchases
Epi Tools
No in-app purchases
Cogni
- Premium Monthly$4.991 Month
- Premium Monthly$7.991 Month
- Premium Monthly$14.991 Month
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- Premium Annual$19.991 Year
- Premium Annual$24.991 Year
- Premium Annual$29.991 Year
- Premium Annual$49.991 Year
- Lifetime Premium$69.99
- Premium Lifetime$99.99









