Best Free Diagramming Tools in 2026

Visual collaboration for distributed teams

4.6/5 on G2 · 13,566 ratings, Sep 2026

Miro is a collaborative online whiteboard platform used by over 80 million users for visual teamwork and innovation. It provides an infinite canvas where distributed teams can brainstorm, diagram, plan projects, run workshops, and map workflows in real time. The platform includes 5,000+ templates for design sprints, agile retrospectives, customer journey mapping, and strategic planning. Miro integrates with 160+ tools including Jira, Asana, Slack, and Microsoft Teams. AI-powered features help generate diagrams, summarize boards, and create structured workflows from unstructured ideas, positioning Miro as a central hub for cross-functional collaboration from discovery to delivery.

Create and collaborate on any diagram, from flowcharts to technical designs

4.1/5 across G2, Capterra and SourceForge · 9,651 ratings, Sep 2026

Lucidchart is a web-based diagramming application for flowcharts, org charts, and technical diagrams. Real-time collaboration lets teams diagram together. Import from Visio and export to multiple formats. Integrations embed diagrams in Confluence, Google Workspace, and Microsoft apps. Templates and shapes for every use case from network diagrams to user flows. The diagram tool trusted by millions for visual communication.

Visual collaboration workspace

4.4/5 across G2 and Capterra · 1,610 ratings, Sep 2026

Creately is a visual collaboration platform that combines diagramming, whiteboarding, and work management on an infinite canvas. It supports flowcharts, org charts, mind maps, wireframes, ER diagrams, network diagrams, UML, BPMN, and other diagram types alongside real-time and asynchronous collaboration. The platform includes AI-powered diagram generation (VIZ), custom databases with data-linked visual apps, wiki-like knowledge management, and OKR alignment tools. Creately holds ISO 27001 and SOC 2 Type 2 certifications with regional data residency options. Over 10 million users and thousands of teams use it for process mapping, project planning, and organizational design.

Online whiteboard for real-time team brainstorming and diagramming

4.7/5 across G2 and Capterra · 501 ratings, Sep 2026

FigJam is Figma's online whiteboard for brainstorming, diagramming, and planning. Real-time collaboration with sticky notes, shapes, connectors, and stamps. Templates for retrospectives, user flows, and workshops. Built-in voting, timers, and cursors make facilitation easy. Seamlessly integrates with Figma design files. Where design teams think together before they design together.

Mind mapping and brainstorming

4.5/5 across G2 and Capterra · 585 ratings, Sep 2026

XMind is a mind mapping and brainstorming application available on desktop (Mac, Windows, Linux) and mobile (iOS, Android). It supports multiple diagram types including mind maps, org charts, tree charts, fishbone diagrams, and timelines. The Premium tier adds real-time collaboration, cloud sync, and an AI copilot for brainstorming assistance. XMind is popular with students, professionals, and teams who need visual thinking tools for planning, note-taking, and idea organization.

Collaborative event design platform for planners and venues to bring events to life.

4.3/5 across G2 and Capterra · 712 ratings, Sep 2026

Cvent Event Diagramming, formerly Social Tables, is a comprehensive event design platform that facilitates collaboration between event planners and venues. It enables users to create accurate, to-scale event diagrams and floor plans within minutes, streamlining the event planning process. The platform is designed to improve communication through real-time collaboration, commenting, and file storage, allowing all stakeholders to visualize and refine event layouts. It offers photo-realistic 3D walkthroughs and interactive floor plans, helping venues showcase their spaces effectively and generate more leads, while empowering planners to manage attendee details with visual seating charts and meal management. This tool is ideal for both event planners seeking to design and execute successful events, and venues looking to attract and convert more business by presenting their spaces in an engaging and detailed manner.

Collaborate in real time on flowcharts, wireframes, and more

4.6/5 across G2 and Capterra · 413 ratings, Sep 2026

Cacoo is a collaborative online diagramming tool by Nulab that lets teams create flowcharts, wireframes, mind maps, network diagrams, and process maps in real time. Multiple users can edit diagrams simultaneously with live cursors, built-in chat, and video integration for design discussions. The platform provides a template library, media assets, and chart components for professional visuals, along with comment-based feedback and secure sharing with password protection. Cacoo integrates with Slack, Google Drive, Confluence, AWS, Microsoft Teams, and supports Visio file imports. Over 4 million users worldwide rely on it for visual collaboration.

Free, open-source diagramming for any use case

4.4/5 on G2 · 452 ratings, Aug 2026

draw.io (also known as diagrams.net) is a free, open-source diagramming tool. Create flowcharts, network diagrams, UML, org charts, and more in your browser. Works offline and integrates with Google Drive, OneDrive, and Confluence. Extensive shape libraries cover every use case. Export to PNG, SVG, PDF, and other formats. No account required, completely free. The diagram tool that proves free can be best-in-class.

Collaborative mind mapping for visual brainstorming and planning

4.4/5 across G2 and Capterra · 332 ratings, Sep 2026

MindMeister is a collaborative mind mapping tool for brainstorming and planning. Teams capture ideas visually, organize thoughts, and create presentations from mind maps. The platform offers real-time collaboration and integrations with productivity tools.

Visual workspace for flowcharts, wireframes, mind maps, and docs

4.6/5 across G2 and Capterra · 247 ratings, Sep 2026

Whimsical is a visual workspace for creating flowcharts, wireframes, mind maps, and docs with AI assistance. Features real-time collaboration, templates, and team management.

Diagrams for teams, seamlessly integrated with Confluence and Jira

4.3/5 across SourceForge, G2 and Capterra · 361 ratings, Sep 2026

Gliffy is a cloud-based diagramming tool built for teams using Atlassian products, offering native integrations with Confluence and Jira for embedding flowcharts, UML diagrams, org charts, network diagrams, and BPMN flows directly into wiki pages and issues. It features a drag-and-drop interface, AI-powered diagram generation from natural language prompts, and a Zero Egress deployment option that keeps all data within Atlassian environments for compliance-sensitive organizations. Gliffy holds SOC 2 Type II, ISO 42001, and Atlassian Cloud Fortified certifications, and supports ITAR, GDPR, and HIPAA compliance requirements. Over 18 million Confluence users access Gliffy through organizations including Disney+, Netflix, Nike, and Siemens.

Collaborative mind mapping, concept mapping, and outlining with AI assistance and real-time editing.

4.9/5 across Trustpilot and G2 · 126 ratings, Aug 2026

Mindomo is a versatile collaborative tool designed for creating mind maps, concept maps, outlines, and Gantt charts. It caters to a wide range of users, from individuals for personal organization and learning to teams for brainstorming and project management, and educators for classroom activities. The platform offers real-time and offline editing capabilities, ensuring accessibility and continuous work regardless of internet connectivity. With AI-powered features, users can quickly generate brainstorming maps, refine content, and create structured notes, significantly boosting productivity and creativity. Mindomo supports cross-platform usage with automatic synchronization across devices, full history tracking, and comprehensive full-text search. Its rich feature set includes visual tags and filters, custom diagram themes, internal topic linking, and multimedia attachments, making diagrams highly interactive and informative. For educational settings, it provides specific tools like assignment creation, grading, and integrations with learning platforms like Google Classroom. For business users, it offers robust task management, project planning with Gantt charts, and extensive export options, making it a powerful solution for visualizing and organizing complex information.

Plan, design, and visualize website structures, user flows, and content with ease.

4.7/5 across G2 and Capterra · 152 ratings, Sep 2026

FlowMapp is a comprehensive website planning tool designed to streamline the process of creating sitemaps, user flows, wireframes, and content architecture. It provides a visual workspace for UX designers, project managers, content strategists, and developers to collaborate and define the structure and user experience of websites and applications. The platform helps users organize information, map out user journeys, and plan content effectively before development begins. By offering dedicated tools for sitemaps, user flows, and content planning, FlowMapp enables teams to visualize complex projects, identify potential issues early, and ensure a cohesive and user-friendly digital product. It aims to improve communication and efficiency throughout the design and development lifecycle.

Quickly design websites and apps with drag-and-drop wireframing

4.3/5 across G2 and Capterra · 154 ratings, Sep 2026

MockFlow is an online wireframing and UI planning tool for designing websites and apps. Create wireframes quickly with drag-and-drop components and pre-built templates. Build sitemaps to plan your information architecture. Collaborate in real-time with team members. Export designs to PDF or share interactive previews. MockFlow's simple interface makes it easy to sketch ideas and iterate on designs without learning complex tools.

Wireframe, diagram, and prototype online with a simple yet powerful visual collaboration solution.

4.3/5 across SourceForge, G2 and Capterra · 121 ratings, Sep 2026

Moqups is an all-in-one online visual collaboration platform designed for teams to share ideas, map flows, and create mockups for UI/UX designs. It allows users to create professional wireframes for websites, apps, and dashboards directly in the browser, without any installation. The platform supports drag-and-drop functionality for easy-to-configure elements, enabling the creation of UI/UX mockups from low to high fidelity. Beyond wireframing, Moqups facilitates the creation of polished flowcharts, sitemaps, org charts, storyboards, user flows, mindmaps, and UML diagrams to bring clarity to complex ideas. Users can also build interactive prototypes by adding interactivity to wireframes and mockups, simulating user experiences for stakeholder presentations and approvals. The tool emphasizes real-time collaboration, allowing teams to brainstorm, plan, design, and give feedback together with live-editing and online whiteboards, making it suitable for both remote and co-located teams. It integrates with popular tools like Slack, Google Drive, and Dropbox, and offers a comprehensive library of stencils, icon sets, and styling options to accelerate the creative process.