Duocortex vs Kern
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Duocortex
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Duocortex is the ultimate app designed by medicos, for medicos. Whether you’re preparing for exams, seeking mentorship, or just want a reliable study partner, Duocortex brings everything under one roof—smart, verified, and real-time
Kern
This app helps you retain knowledge from books you've read by creating interactive flashcards. It uses spaced repetition to resurface information as it begins to fade, supporting both fiction and non-fiction content. Review your library offline and see an honest picture of what you remember.
- Spaced repetition flashcards
- Supports fiction and non-fiction
- Offline review capability
- Interactive cards
- No account required
- Book fading visualization
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You spent ten hours reading a book. A month later, the sharpest ideas are fuzzy, characters blur, and the moments that moved you are already slipping away. Kern keeps the books you finish alive. Add a title and it becomes a deck of sharp, swipeable cards. For non-fiction, Kern brings back the key ideas, examples, arguments, and surprising connections. For fiction, Kern revisits the characters, relationships, turning points, themes, motifs, and settings that made the story stay with you. Then spaced repetition takes over, resurfacing cards as the book begins to fade. HOW IT WORKS 1. Add a book you've finished. Just the title - no uploads, highlights, or homework. 2. Kern creates a deck designed to bring that specific book back to mind. 3. Swipe for a few minutes a day. Cards from across your library interleave, while neglected books gradually return to the surface. FICTION AND NON-FICTION Fiction and non-fiction receive different kinds of cards because remembering a novel is not the same as remembering a business book. Fiction cards contain full-book spoilers and are intended for books you've already finished. WHY READERS PICK KERN - Cards for both fiction and non-fiction - Your whole library in one interleaved feed - Interactive cards that check what actually stuck - Original, paraphrased cards, not excerpts and not a substitute for reading - Review anywhere, fully offline after a deck is created - No account and no sign-up THE WALL Every book you add lives on the Wall. Review it and it stays inked. Neglect it and you can watch it fade. Fiction and non-fiction are clearly marked, and mixed libraries can open a feed for either type. No streaks, guilt trips, or leaderboards. Just an honest picture of what is still in your head. PRICING Your first book is free, with no payment required. Continue with Kern Plus for unlimited books, or unlock an individual book with a one-time purchase. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. You can manage or cancel them in your App Store account settings. Terms of Use: https://kern.cards/terms Privacy Policy: https://kern.cards/privacy Read on.
Screenshots
Verdict
The clearest difference is in-app purchases: Duocortex at none against Kern's 3. Duocortex also leads on iOS requirement (15.6 vs 17.0). On price, update cadence, 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. Kern sells 3 in-app purchases, starting at $5.99 per month. Duocortex asks for nothing beyond the download.
Duocortex ships an update every 11 days, Kern fortnightly. The most recent releases landed on October 5, 2026 and October 7, 2026 respectively.
| Parameter | Duocortex | Kern |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (2 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 2 — better |
| Update frequency | Every 11 days — better | Fortnightly |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 15.6 — better | 17.0 |
| Further details — not scored | ||
| Size | 40 MB | 23 MB |
| Age rating | 12+ | 4+ |
| Developer | Duocortex | Quantum IT |
In-app purchases
Duocortex
No in-app purchases
Kern
- Kern Plus (Monthly)$5.991 Month
- Kern Plus (Annual)$49.991 Year
- Unlock One Book$3.99









