Cross-Platform Note Taking Apps

Notesnook is a cross-platform note-taking application designed for private knowledge management. It functions as a secure personal information manager that prioritizes user data confidentiality by employing client-side end-to-end encryption for all stored notes, attachments, and metadata. By utilizing a local-first synchronization model, the application ensures that information remains accessible offline while maintaining a consistent state across desktop and mobile devices. The platform distinguishes itself through a focus on privacy-centric organization and secure information handling. Users can structure complex knowledge bases using nested notebooks, tags, and bidirectional linking, all while keeping their data protected from unauthorized access via local application locks and multi-factor authentication. For external collaboration, the system provides password-protected sharing, ensuring that sensitive content remains encrypted and restricted to authorized recipients. Beyond core note-taking, the environment includes a component-based rich editor that supports tables, formulas, and media, alongside tools for capturing and archiving web content. The application also integrates task management features, allowing users to schedule reminders and track objectives directly within their notes. To support data sovereignty, the platform offers comprehensive import and export capabilities, enabling users to migrate data from other services or create local backups to prevent vendor lock-in. The software is available as native packages for major desktop and mobile operating systems, providing a consistent interface that can be customized to suit individual workflows.

Joplin is an open-source, cross-platform note-taking application designed for secure, private knowledge management. It functions as a local-first productivity platform, maintaining a complete relational database on the user's device to ensure offline availability and high-performance data retrieval. The application prioritizes data sovereignty by implementing an end-to-end encryption layer, which secures all information locally with a master key before any synchronization occurs. The platform distinguishes itself through a delta-based synchronization engine that transmits only specific file changes, optimizing performance across multiple devices and operating systems. Users can extend the core environment through a plugin-based architecture that supports custom themes, scripts, and UI components. For professional or collaborative environments, the software offers self-hosted synchronization options and team management capabilities, allowing organizations to maintain full control over their data infrastructure and security policies. Beyond core note-taking, the application supports rich multimedia content, including embedded files, diagrams, and mathematical expressions. It provides a comprehensive web-clipping tool for archiving online research and a RESTful API that enables programmatic access to notes and metadata for external integrations. The system is built on a cross-platform abstraction layer to ensure consistent behavior across desktop and mobile environments.

CryptPad is a self-hosted, zero-knowledge office suite designed for real-time collaborative editing and content management. It provides a privacy-centric infrastructure where documents, files, and notes are encrypted in the browser before transmission, ensuring that the server administrator cannot access the underlying data. The platform implements zero-knowledge user authentication, utilizing cryptographic keys to verify identities so that plain text passwords are never stored on the server. To further isolate sensitive operations, the system employs a security architecture that separates the user interface from cryptographic processes. The suite covers a range of administrative and operational capabilities, including user registration management, instance branding customization, and server parameter configuration. It also includes diagnostic utilities for system configuration and supports containerized deployment for consistent environment installation.

Notable is a local-first markdown note taking application and document manager. It functions as a personal knowledge base that persists notes as plain text files on the local disk to ensure data portability and user ownership. The application provides a markdown editor featuring a split-pane live preview for real-time rendering of content, including mathematical expressions and diagrams. Information is organized through a hierarchical tagging system that allows for nested labels and multi-dimensional categorization. The software includes tools for bulk note management to apply operations across multiple files simultaneously and a minimalist interface mode for distraction-free writing.

Siyuan is a self-hosted knowledge management platform designed for private note-taking and information organization. It functions as a local-first application that stores all user content as plain text files on the local file system, ensuring data ownership and offline availability. The platform utilizes a block-based document model, which structures information as a tree of independent content blocks to facilitate granular manipulation and bidirectional linking. Users can extend the core functionality through a sandboxed plugin architecture, allowing for the development of custom themes and scripts that modify the editor behavior and user interface to suit specific workflows. The software is built as a containerized application, supporting deployment within isolated environments to standardize dependencies and simplify maintenance across various hosting infrastructures. It maintains consistency across multiple devices through a persistent socket connection that propagates state changes in real time, while the interface utilizes virtual document object model reconciliation to manage updates efficiently.

Blinko is a personal knowledge management system and an LLM-powered knowledge base that enables users to capture and organize thoughts through a bi-directional knowledge graph. It functions as a RAG-enabled note-taking application and a self-hosted Markdown editor, allowing for the creation of permanent documentation and fleeting notes. The project distinguishes itself by integrating retrieval-augmented generation to provide conversational querying and AI-powered analysis of private document libraries. It supports both cloud-based and local AI model integration, enabling users to perform semantic searches across multimodal content, including PDFs and images, while maintaining data privacy. The system covers a broad surface of capabilities, including hierarchical tagging, bidirectional linking, and a plugin-based extensibility framework with a dedicated marketplace. It manages data through a combination of hub-based and peer-to-peer synchronization, with support for S3-compatible object storage and automated archiving. The application is available for cross-platform deployment on macOS, Windows, Linux, and Android, and can be self-hosted using Docker containers.

Trilium is a local-first personal knowledge management system designed to store and organize information on a user's own device. It functions as a hierarchical knowledge base where every note acts as both a standalone document and a container for nested children, allowing for complex information relationships and deep categorization. The platform distinguishes itself through a component-based interface that dynamically renders diverse content types, including rich text, diagrams, and executable scripts. All data is persisted within a single relational database file, which supports a versioned archive and a soft-delete lifecycle to protect information integrity. This architecture enables users to manage large volumes of interconnected data within a unified, extensible workspace. The system provides a comprehensive environment for digital asset organization, combining document management with scriptable automation. It utilizes a combination of server-side rendering and client-side orchestration to maintain a responsive interface for navigating and searching through structured information.

Pell is a JavaScript text editor library and browser-based rich text editor. It provides a lightweight WYSIWYG HTML editor for formatting styled text and outputting HTML directly within a web browser. The library is a dependency-free vanilla implementation that uses standard Web APIs. It allows for the definition of custom editor actions and text actions to extend the toolbar and the creation of custom visual themes to modify the editor appearance. The editor covers rich text editing and browser-based text formatting, including the application of bold, italic, headings, and lists. It also supports managing text layout and the insertion of media and links.

Boostnote is a local-first note management system and markdown text editor designed for personal knowledge management. It functions as a desktop application that reads and writes markdown files directly to the local disk, allowing for the creation of a searchable personal knowledge base and digital garden. The application provides a writing interface that renders markdown syntax in real time. It is used to organize fragmented information, maintain project documentation, and author structured technical guides.

Saber is an end-to-end encrypted note-taking application designed for handwritten content. It provides a digital ink canvas for creating documents and a system for organizing those notes within a hierarchy of nested folders. The application ensures privacy by encrypting both notes and device configurations on the client side before they are synchronized across devices. This process prevents the server from accessing stored content or user settings. The toolset includes digital ink annotation capabilities, such as text highlighting and layer-based stroke rendering. The user interface supports a dark mode palette for low-light environments. Stability is monitored through a mechanism that collects anonymized device specifications and crash logs.

Quill is a JavaScript rich text editor library used to build WYSIWYG web editors. It serves as a modular editor framework for creating browser-based document authoring tools with a customizable interface and document model. The system functions as a modular content editor, providing a plugin system to extend formatting and embedding capabilities. This allows for the development of specialized text editors through custom modules and formatting plugins. The library covers the implementation of visual content creation interfaces that render formatted text and media in real time. Its primary capabilities include rich text editing and the integration of visual authoring tools into web applications.

TinyMCE is a JavaScript rich text editor and WYSIWYG HTML editor that provides a visual interface for creating and formatting content within web applications. It functions as an extensible editor framework and web content management UI, allowing users to author and style documents through a browser-based interface. The project is distinguished by a plugin-based extension system and a public API that enable the addition of custom capabilities and modifications to the visual interface. It utilizes a framework-agnostic core, providing dedicated integration for React, Vue, and Angular. The system covers broad capability areas including rich text editing, web application content creation, and custom editor development. It includes a schema-driven HTML sanitization process to ensure valid output.

Omni-Notes is a mobile note-taking application and personal knowledge management tool used for creating and organizing text notes, checklists, and sketches. It functions as a multimedia knowledge base that integrates voice input, images, and audio files to maintain a searchable digital archive. The application utilizes a tag-based filtering system to group and search for stored information using metadata and categories. It further extends productivity by providing home and lock screen widgets that expose note snapshots and shortcuts for rapid access. The system supports the creation of structured content, such as to-do lists and hand-drawn sketches, alongside standard text notes. Capabilities include attaching multimedia files for supplementary context, capturing spoken text via voice commands, and exporting data for backup purposes.

Note-gen is an artificial intelligence-assisted note-taking application and knowledge management tool designed for local-first data ownership. It functions as a workspace that leverages language models to organize, summarize, and synthesize personal notes into structured documents while maintaining offline accessibility. The platform distinguishes itself through a multimodal workflow orchestrator that chains sequences of tasks to process text, images, and external data. By integrating vision-language models, it extracts information from visual inputs like screenshots and documents, converting them into structured text. Users can further extend these capabilities by connecting third-party artificial intelligence services and external search tools to ground generated content in their own local knowledge base. The system supports a variety of data management and retrieval methods, including vector-based semantic search to locate information based on intent rather than keywords. It maintains consistency across distributed environments by synchronizing files through remote storage providers such as version control systems or cloud storage.

This project is a web-based rich text editor designed for markdown content authoring. It provides a dual-mode interface that synchronizes raw markdown syntax with a visual WYSIWYG editing experience, allowing users to toggle between modes while maintaining a consistent document state. The editor distinguishes itself through a modular architecture that supports custom content blocks and plugin extensions. This system enables the integration of specialized features such as code syntax highlighting, chart rendering, diagram generation, and complex table formatting. It also includes a live preview mode that coordinates the vertical scroll position between raw input and rendered output for real-time feedback. Beyond core editing, the project offers a read-only viewer mode for displaying formatted content and supports interface localization for global accessibility. It is built to be embedded into web applications through specialized wrapper components that facilitate integration with various frontend frameworks.

wangEditor is a JavaScript-based web rich text editor and WYSIWYG interface used for composing formatted documents directly in a browser. It serves as a client-side editing component for web applications to handle document styling and content manipulation. The editor is built as a plugin-based engine, allowing new features and formatting capabilities to be added through a registration interface. It utilizes a schema-driven approach to validate HTML tags and attributes, ensuring clean and consistent document output. The project provides tooling for content management systems, frontend text input development, and the integration of styled text and document layouts into web projects.

anytype-ts is a TypeScript client library and offline-first knowledge base client designed for managing structured layouts and modular blocks within a private distributed database. It functions as a zero-knowledge data synchronizer and schema-driven API wrapper that enables the secure replication of encrypted data across devices. The library utilizes peer-to-peer connectivity and zero-knowledge encryption to ensure data remains private and unreadable to hosting infrastructure. It employs a schema-driven approach to compile data definitions into typed language bindings, ensuring consistent communication via a remote procedure call interface. The system supports personal knowledge management through a custom data model that organizes tasks, wikis, and diverse information. Its capability surface includes web content capture, localization synchronization, and the creation of composable content such as boards and calendars.

This project is a customizable browser text editor and a schema-driven document framework designed for building React-based WYSIWYG content editors. It replaces standard text areas with a system that represents content as a structured data tree rather than flat HTML, allowing for precise manipulation and validation of documents. The framework serves as an extensible content management interface and a TypeScript UI component library. It enables the development of specialized authoring tools through a plugin system and the use of strongly typed building blocks to ensure consistency across document updates. The system covers structured content authoring and the development of rich text workflows. It includes mechanisms for state-based change tracking to support undo operations and real-time synchronization across clients.

Marktext is a cross-platform desktop application designed for markdown document authoring and structured note-taking. It functions as a WYSIWYG text processor, providing a distraction-free interface that renders formatted content in real-time while hiding the underlying markup syntax. The application utilizes a multi-process architecture that separates system integration from the user interface, ensuring consistent performance across Windows, macOS, and Linux. By employing a custom editor core built on native browser capabilities and a structured syntax tree, it manages complex document elements such as mathematical expressions, diagrams, and code blocks. The software includes a plugin-based extension system that allows for the injection of custom functionality and interface components. It is distributed as an open-source project, maintaining a consistent environment for technical documentation and personal knowledge management.