21 Open Source Alternatives to Notion

Affine combines powerful writing, drawing, and planning tools in one unified platform. Its multimodal AI copilot helps transform ideas into structured content while enabling real-time collaboration and effortless creativity. Built with a local-first, privacy-focused approach, this customizable, open-source tool is ideal for individuals and teams looking to streamline their workflow.

Joplin offers a comprehensive note-taking solution that supports multimedia content, mathematical expressions, and diagrams. With synchronization options via Joplin Cloud and other services, users can access and update their notes from Windows, macOS, Linux, Android, iOS, or even a terminal application. Its built-in end-to-end encryption ensures that your data remains private while enabling features like web clipping, custom plugins, and collaborative note sharing.

Notesnook delivers a fully encrypted note-taking experience that protects your data from the moment it leaves your device. The app supports real-time sync across desktop, mobile, and web clients, and features a rich text editor with Markdown, tables, and code blocks. It also includes advanced tools like a web clipper, bidirectional note linking, and a secure note vault with app lock options, all built with modern encryption protocols such as XChaCha20-Poly1305 and Argon2.

AppFlowy is an AI-powered collaborative workspace designed to enhance productivity through seamless project management, note-taking, and task organization. It features customizable content blocks, offline mode functionality, and self-hosting options, ensuring privacy and control over your data. With mobile apps and a vibrant community, AppFlowy caters to both individuals and teams seeking flexible and efficient work solutions.

Logseq empowers you to manage daily notes, tasks, and meetings using linked references, queries, and search features that transform scattered information into a coherent network. It supports a variety of workflows including PDF annotations, flashcards, and whiteboards, all within an intuitive, markdown-friendly interface. Enjoy robust community support, multiple plugins and themes, and mobile apps for both iOS and Android to extend its capabilities.

Outline enables your team to create, manage, and share a dynamic knowledge base with ease. The platform boasts a blazing fast editor with markdown support, realtime collaborative editing, and powerful search capabilities including AI question answering. Integrated with tools like Slack and over 20 other popular integrations, it also offers customization options such as dark mode and custom domains. Outline is open source, allowing users to self-host and tailor the experience to their organizational needs.

FastGPT delivers a robust knowledge base platform that enables the creation of domain-specific AI assistants by automating text preprocessing, vectorization, and QA segmentation. Its visual drag-and-drop interface streamlines the design of complex workflows, while seamless API integrations with platforms like Discord, Slack, and Telegram allow for easy expansion and customization of LLM applications.

XWiki organizes your company’s knowledge with its innovative Structured Wiki approach. The platform offers a suite of standard solutions like XWiki Standard, Business Apps & Connectors, and XWiki Cloud, as well as custom solutions tailored to specific organizational needs. Backed by 20 years of experience, XWiki enables fast, user-friendly information sharing and collaboration, reducing time wastage and enhancing operational efficiency for teams across various industries.

Orgnise consolidates your team’s knowledge, projects, and collaboration efforts into a single platform. With features such as structured workspaces, organized collections, a Notion-style rich text editor, and intuitive board views, it simplifies managing data and visualizing workflows. The system enables quick team onboarding and reduces context switching by replacing multiple tools with one efficient solution.

Vrite enables developers to write and format content effortlessly with a modern WYSIWYG editor that supports Markdown, IDE-level syntax highlighting, and autocompletion. The platform offers headless management with API integrations, Git sync for a docs-as-code approach, AI-powered semantic search with Q&A, and flexible customization including extensions and role-based controls. It provides dynamic views and panels to effectively manage content schedules and metadata.

Shelf helps teams track, manage, book, and check out assets ranging from office equipment to heavy machinery. The platform features real-time tracking via QR codes, customizable asset pages, a booking system to avoid double bookings, kit management, GPS location tracking, and an intuitive dashboard. With a progressive web app and mobile support, Shelf integrates seamlessly into your workflow and scales with your business needs.

SiYuan refactors your thinking by integrating block editing, bidirectional links, and a rich set of elements that support over 20 block-level and 10 span-level types. It facilitates smooth editing of large documents, offers visual outlines, and includes intelligent features such as spaced repetition and AI integration, all while prioritizing user privacy and local data control.

AnyType provides an all-in-one workspace with a powerful block-based editor, customizable databases, and a rich set of templates, enabling creative, no-code content creation. Its local-first design, featuring on-device encryption and peer-to-peer sync, assures true privacy and seamless offline access. Designed for diverse use cases—personal productivity, team collaboration, and community management—AnyType eliminates the dependency on central servers while maintaining rapid performance.

Docmost empowers teams to build and maintain a structured knowledge base by offering a real-time collaborative editor with support for rich-text, diagrams, tables, and LaTeX. The tool features a robust permissions system, organized spaces, group management, inline commenting, page history, nested pages, and efficient searching. It also facilitates file attachments and content import/export in Markdown and HTML, ensuring a seamless and versatile documentation experience.

OpenNotas delivers a streamlined note-taking experience across phones, tablets, and desktops. It features seamless syncing with offline support and robust end-to-end encryption using the AES algorithm, ensuring your data is private and secure. The app’s intuitive design lets you start writing notes with a single tap, eliminating unnecessary complexity.

Standard Notes offers a secure digital vault where you can store plain text, markdown, rich text, and more. The platform not only provides robust encryption and offline access across web, desktop, and mobile devices, but also scales with advanced features in its paid plans, such as nested folders, note revision history, and multi-account sharing. Its open source nature and independently audited security ensure you remain in complete control of your data.

Justnote provides a lightweight solution for drafting, editing, and storing notes with a user-friendly WYSIWYG editor offering options like bold, underline, and color customization. Available on web, iOS, and Android, it automatically syncs your data across devices. The decentralized approach leverages Web3 technology, ensuring your account is cryptographically generated and your notes remain encrypted and truly yours.

Bangle-io works directly in your browser, enabling you to create, edit, and organize notes that are stored locally as Markdown files. Designed with simplicity and power in mind, it offers a rich WYSIWYG experience, supporting features like collapsible headings, emojis, and Markdown shortcuts. Organizational tools such as folder views, tags, workspaces, and a robust search function help manage your notes efficiently without requiring sign-up or internet connectivity.

Boost Note offers a powerful markdown editor with support for diagrams and real-time collaboration, making it easy for teams to document and manage technical specifications, product backlogs, and meeting minutes. The tool provides flexible views such as Kanban, Calendar, and Table, while integrating seamlessly with popular apps like GitHub, Trello, and Slack to keep everyone aligned and productive.

Standard Notes offers a robust platform for creating and managing notes with advanced encryption that safeguards your data from unauthorized access. The app supports markdown, rich text, and secure file storage while ensuring smooth cross-platform syncing and offline accessibility. Its open-source design and independently audited security features make it a reliable choice for anyone who values privacy and data protection.

Zettlr supports your writing journey by managing projects from idea to publication. It integrates advanced citation management compatible with Zotero, JabRef, and Juris-M, offers customizable templates for various publication needs, and provides powerful note-linking and a Zettelkasten workflow. Its privacy-first design ensures your data remains local without forced cloud synchronization or telemetry.