Easchi is a local-first, privacy-focused all-in-one system for encrypted knowledge.
We seamlessly fuse “bidirectional linking notes” with “scientific spaced repetition flashcards,” while supporting encryption for both local files and filenames.
From knowledge input, restructuring, and memorization to offline content distribution, Easchi helps you complete the full closed-loop management—ensuring your notes never turn into digital trash.
Absolute Data Sovereignty & Multi-level Encryption
Local-first, rejecting cloud lock-in, eliminating worries about data export or backup. Supports encryption for individual files, entire directories, and filenames. You have absolute sovereignty over your data.
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Markdown Input Mode & Standard HTML Storage
A quick input mode close to Markdown, built on standard HTML storage. It offers a lightning-fast text input styling experience while perfectly supporting rich media formats like mind maps, audio, and doodles, freeing you from worrying about Markdown syntax and dialects.
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Dual-Algorithm Flashcards & Server-Side Optimizer
Create flashcards from notes and blocks with one click. Supports both the FSRS algorithm and the TSRS algorithm. Provides standard front/back flashcards, cloze deletions, and advanced card types including single-choice, multiple-choice, and multi-blank fill-ins. Supports optimization using historical review data.
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Secure Card Package Distribution for Educators
Tailored for teachers and training institutions. Supports creating card learning packages tailored to courses. Supports setting passwords and expiration ranges, perfectly fitting offline content distribution scenarios, with teachers fully controlling distribution channels.
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To help you build absolutely secure digital assets, Easchi provides comprehensive advanced features in performance, security, knowledge management, and collaboration:
Deep Link Ecosystem: Supports bidirectional links, backlinks, outline views, and knowledge graphs, and allows flexible tagging anywhere within note content.
Multi-format Compatibility & Processing: Supports viewing and annotating PDF files, browsing office documents like docx and xlsx, and highlighting/editing source code files.
Decoupled Attachment Storage: Attachments can either be directly embedded within notes via Base64 encoding or converted into independent attachment storage, facilitating cross-referencing across multiple files and significantly reducing space usage.
Data Import & Migration: Supports importing and exporting standard Markdown syntax and partial Obsidian syntax, ensuring data integrity during user migration.
Full Plain Text Application Data Storage: Except for note content, non-cached data generated by application runtime is stored in plain text formats (such as TOML, TSV, JSONL, etc.) in the user document directory. For large knowledge bases, enabling database acceleration can significantly improve query and retrieval speeds.
Free Multi-Workspace Switching: Supports creating and independently managing multiple workspaces, each with fully isolated personalized configurations and independent file directories.
Dynamic Linking & Quick Card Creation: While reading and editing, supports converting an entire note or specific content blocks (Block) into flashcards with one click. The underlying content is bound in real-time; modifying the original note automatically synchronizes and updates the card content, completely saying goodbye to repetitive maintenance.
Dual-Algorithm Deep Optimization: Switch freely between built-in memory algorithms based on personal preference; also supports deep parameter tuning based on personal review history.
Secure Card Package Sharing: Supports filtering cards from your personal library and packaging them for sharing. Card packages can be customized with passwords and expiration dates, effectively protecting creators’ intellectual achievements.
Seamless Import & Learning: Supports one-click importing of card packages shared by others. Once system validity is verified and the correct password is entered, you can start learning immediately.
Built-in Multi-version Synchronization: The sync service supports multi-version backtracking, allowing you to view and flexibly clean up historical versions at any time; automatically merged into zip packages for upload as needed, vastly improving sync efficiency for heavy users.
