| What it does | Stop forgetting what you read.
| Free tutorials and resources for COBOL and mainframe technologies
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| Stage | Not given
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| Founded | Not given
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| Based in | HR
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| Pricing model | Freemium
| Free
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| Pricing | 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 | - 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
| - Comprehensive COBOL tutorials covering basic syntax to advanced techniques
- Step-by-step guides for JCL, COBOL, CICS, DB2, and z/OS concepts
- Progress tracking and practical challenges
- DB2 and VSAM data storage technologies
- Community forum for mainframe learners
- Quick reference guides and cheat sheets
- Interview questions and glossary resources
- Mainframe and COBOL job board
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| What makes it different | - 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
| - Preserves and shares mainframe knowledge as experienced professionals retire
- Designed for beginners and career changers with practical examples
- Guidance on integrating mainframe systems with modern technologies
- Comprehensive coverage of all major mainframe technologies and tools
- Completely free learning platform with no subscription required
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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) | 14 ▲ +1 (up) since last check | 11 ● no change since last check |
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| Trust Flow (Majestic) | 3 | 7 |
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| Citation Flow (Majestic) | 21 | 28 |
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| Referring domains (Majestic) | 23 | 47 |
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Kern
MainframeMaster