| What it does | Practice for the new AI-assisted coding interview format with real codebases and an AI assistant
| Stop forgetting what you read.
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| Stage | Startup
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| Founded | 2025
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| Based in | Not given
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| Pricing model | Freemium
| Freemium
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| Pricing | Free: a few complete problems with every stage and the first stage of additional problems. Nyrion Pro: $19/month or $149/year (35% off).
| First book free. Kern Plus subscription (monthly or yearly) unlocks unlimited books, or single-book one-time purchases available.
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| Key features | - Real multi-stage codebases instead of algorithm snippets
- AI assistant in the editor for directing and collaboration
- Test-gated progression with escalating requirements
- AI interviewer evaluation and detailed reports
- Problems tagged by company and difficulty level
- Coverage of multiple major tech company formats
- Persistent sessions and progress tracking
- Curated and continuously monitored problem content
- No AI solution generation without user direction
| - Flashcards generated from book titles without highlights or uploads
- Spaced repetition across all books in one interleaved feed
- Four card types: quick check, fill the blank, explain simply, myth buster
- Home Screen widget for answering cards without opening the app
- Wall widget showing how fresh each book is
- Lock Screen widgets showing which book is fading next
- Reminders at your chosen quiet time, only on days you haven't reviewed
- No account required, reviews work fully offline
- Works with paper books, Kindle, audiobooks and library copies
- Cards written in Kern's own words, not excerpts from books
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| What makes it different | - Practices the actual AI-assisted format now used by major tech companies, not traditional algorithm interviews
- Built by engineers who experienced these new interview formats themselves
- Problems curated from real candidate reports with continuous monitoring and updates
- Evaluates and reports on agent direction skills, not just solution correctness
- Free tier lets you try the format fully before paying
| - No account, sign-up or email capture required
- Works for books without highlights, uploads or notes
- Covers audiobooks and library copies that other retention tools cannot handle
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| Free plan | Not given
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| Open source | Not given
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| Platforms | Not given
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| Public API | Not given
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 7 ▲ +1 (up) since last check | 14 ▲ +1 (up) since last check |
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| Trust Flow (Majestic) | 7 | 3 |
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| Citation Flow (Majestic) | 26 | 21 |
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| Referring domains (Majestic) | 21 | 23 |
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Nyrion
Kern