Best Free Diagram Software
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Compare the Top Free Diagram Software as of September 2025
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What is Free Diagram Software?
Diagram software allows users to visually represent data, processes, and ideas through various types of diagrams. These tools offer an intuitive interface that helps users drag and drop elements, easily connecting shapes, text, and images to create meaningful visual representations. Many diagramming applications come with templates and pre-designed components to speed up the creation process, allowing users to focus on customization. Collaboration features are often included, enabling teams to work together in real-time or asynchronously. Popular diagram software options are used across a wide range of industries, from project management to software design, helping streamline communication and decision-making. Compare and read user reviews of the best Free Diagram software currently available using the table below. This list is updated regularly.
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1
Miro
Miro
Keep your team's minds in sync with Miro (formerly RealtimeBoard and AWW app). A virtual whiteboard and remote collaboration tool, Miro helps cross-functional teams work more efficiently together to build great things. The platform allows teams to ideate, visualize, and share ideas without any boundaries. It comes with over 200 pre-made templates for capturing and visualizing ideas, collaboration tools such as comments, chat, screen sharing, and video chat, and integrations with popular business tools. Miro AI. You and your team, supercharged. You're here to create the next big thing and we're here to help. Unlock the power of your ideas with Miro AI – your new launchpad for creativity, collaboration, and productivity.Starting Price: $8 per month -
2
Figma
Figma
Where teams design together. Figma helps teams create, test, and ship better designs from start to finish. Fast and powerful, just like your work. Packed with design features you already love plus unique inventions like the Arc tool and Vector Networks, Figma helps you keep the ideas flowing. No need to stop to install, save, or export. It’s what any good cloud software should be. Bring your ideas to life faster in animated prototypes that feel like the real thing. Get insights from users and test concepts earlier and more often. Share a link to your design files or prototypes, and get feedback in context. Or, jump into the same file with your teammates—no matter where y’all are in the world—and co-edit live. Create a scalable design system that’s accessible for your organization and easy for you to manage. When all designers are speaking the same language, everyone’s more empowered to do their best work.Starting Price: $12.00/month/user -
3
Lucidchart
Lucid Software
Lucidchart is an advanced diagramming tool designed to help businesses and teams optimize their processes, systems, and workflows with intelligent, data-driven diagrams. The platform combines powerful AI features, such as AI-generated diagrams, data linking, and real-time collaboration, to make visualizing complex systems and architectures faster and more efficient. Lucidchart supports multiple use cases, including process maps, flowcharts, technical diagrams, organizational charts, and systems planning. Its seamless integrations with popular apps like Jira, Confluence, Slack, and Teams allow for enhanced collaboration, enabling teams to align on priorities and act on insights quickly. Lucidchart is the perfect tool for anyone looking to create professional diagrams in less time, while fostering better decision-making and innovation.Starting Price: $7.95/month/user -
4
Samepage
Samepage
Start collaborating with your team and get more things done with Samepage, an award-winning team collaboration software. With Sampage, teams of all shapes and sizes can take advantage of a wide range of online collaborative tools including team chat, video conferencing, task management, file sharing, real-time document collaboration, and more. Its integrates with leading business apps also helps users consolidate workflows and eliminated email overload.Starting Price: $7.50/month/user -
5
Backlog
Nulab
Backlog is a project management and collaboration tool for teams that want higher productivity, greater visibility, and simple project tracking. Development teams can work together with Design, Marketing, IT, and more to release high-quality projects, faster. Core features include Projects, Gantt Charts, Burndown Charts, Issues, Subtasking, Watchlist, Comment threads, Version control, File sharing, Wikis, and Bug Tracking. Update your projects on the go with iOS and Android apps.Starting Price: $35/month -
6
EdrawMax
Wondershare
Creating flow chart, mind map, org charts, network diagrams and floor plans with rich gallery of examples and templates. Edraw Max is an extremely powerful all-in-one diagramming tool that can serve all of your purposes. Whether you need to draw flowcharts, fishbone diagrams, UML diagrams or design floor plans, office layouts, you can find what you want in Edraw Max. Importantly, it is quite affordable. Templates let you go fast. Get inspired and start your design quickly by choosing from thousands of our professionally designed templates. Excellent file compatibility allows you to import Visio files or export your drawings to a variety of familiar file formats, such as Visio, PDF, Word, PPT, JPEG, Html, etc. Edraw Max allows you to create more than 280 sorts of diagrams effortlessly, from the technical diagrams to the attractive infographics, which leaves Visio far behind.Starting Price: $99 per user per year -
7
FigJam
Figma
An online whiteboard for teams to collaborate. Ideate, share, discover. Build and riff on ideas together. Communicate more ideas with sticky notes. Dot vote, stamp, emote, draw, or chat to react with soul. Use markers, shapes, and connecters to organize your thoughts and show how they work together. Document journeys and systems with out-of-the box shapes and connectors that snap to the grid. Easy to learn and intuitive to use, FigJam keeps you and your team flowing and jamming. FigJam and Figma live side-by-side, so all design work, from ideation to execution, can be found in one place. And, teammates can leverage design libraries in FigJam to create artifacts that are consistent and on-brand. Emote with quick expressions without cluttering your FigJam workspace. Use stamps to vote for ideas, share the love, or note where follow-up is needed. Cursor chat gives you a quick way to share thoughts when jamming live. Use default library assets or your own components to customize your work.Starting Price: $3 per editor per month -
8
Google Drawings
Google
Create shapes and diagrams. Add some color to your documents, presentations, and websites with easy to create charts and diagrams. Get it done together. Build charts, layout diagrams, create flow charts, and then easily add them to other documents or embed them on a website. Care to comment? Comment on a shape or text box to give context to your discussion. Send an email notification by adding someone to a comment .Access anywhere, anytime. All your drawings are automatically saved and stored in Google Drive. Access them wherever you go, from any device. -
9
draw.io
JGraph
draw.io (also known as diagrams.net) is a powerful and flexible online tool for creating diagrams, flowcharts, and visual representations. It allows users to design a wide range of diagrams, from simple organizational charts to complex network architectures. The platform integrates seamlessly with popular cloud storage services such as Google Drive, OneDrive, and GitHub, providing easy access and collaboration capabilities. Draw.io prioritizes privacy and security, allowing users to store their diagrams locally or on the cloud, ensuring that data remains private and under the user's control. -
10
Napkin
Napkin
Napkin turns your text into visuals so sharing your ideas is quick and effective. Forget prompting, Napkin works directly from your text. Napkin generates the most relevant visuals based on your text, then you pick the one that best expresses what you have in mind. Napkin visuals are fully editable, so you can adjust content and style to maximize their impact. Add or swap icons from our extensive database. Emphasize style, they’re smart & versatile. Dynamic connectors that can connect anything. Colors that always look good in light or dark mode. Visuals created in Napkin can be used anywhere. Captivate your audience with auto-generated infographics, diagrams, flowcharts, and more. Napkin helps you transform your existing text content into visuals like diagrams, charts, scenes, and images. Think of it as having a personal visual expert right at your fingertips, ready to bring your ideas to life.Starting Price: Free -
11
Cacoo
Nulab
Cacoo by Nulab is an online diagram software trusted by more than 2 million users. Cacoo lets modern teams create wireframes, flowcharts, organization charts, mind maps, and more, enhancing collaboration and productivity. The platform also offers integrations with leading apps, including Dropbox, Google Drive, Confluence, and more.Starting Price: $6/month/user -
12
QuickDBD
Dovetail Technologies
Draw diagrams quickly by typing. Draw schemas without leaving the keyboard. Only give the details you want. Capture ideas quickly. Don’t let GUI tools interrupt your flow. Pretty diagrams make your documents look good and help you communicate clearly. Share your diagrams online. -
13
ERD Lab
ERD Lab
ERD Lab is an online ER Diagram Tool that allows you to design your database visually. Import existing SQL or develop new database without writing a single line of code. Visualize your schemas to share & collaborate with your team. Export SQL or PDF/Image when done. All for FREE!Starting Price: $0 -
14
Pencil Project
Evolus
Pencil is an open source user interface drafting tool that Evolus builds on Mozilla 's technologies . This tool helps analysts and application interface developers to quickly draw application interfaces to document communication with customers in the process of collecting requirements or as a basis for the team. application development. The Pencil tool building project is one of Evolus' efforts to give back to the community. It is for that reason that Pencil has been released as an open source tool (GPL license) so that anyone can have the opportunity to use and access its source code to adjust and upgrade. . Pencil can be deployed as an add-on to the Mozilla Firefox 3 browser or as a standalone application. Pencil is a cross-platform application and can work well on any platform that Mozilla Firefox 3 supports. -
15
Creately
Creately
Creately is a AI powered diagramming and visual collaboration platform. It is one of the first products to support complex diagram generation through AI via standardized diagram templates. Visually add ideas to various frameworks, map processes, flows, or entire organizations, create technical architecture documents; the possibilities are endless with the 10,000+ templates that come with the platform. At first, Creately unlocks more innovation, creativity, and big-picture thinking in teams. On longer use, Creately becomes the single source of truth in projects and teams and acts as a Visual Database. You can add notes, attachments, link data, and bring together all relevant information in Creately. Creately is great for hyper-collaborative meetings and workshops, to run brainstorming sessions, map processes and flowcharts, create technical diagrams and designs, and plan and run agile projects.Starting Price: $8/month/user -
16
Venngage
Venngage
Venngage is the simple design platform for bringing your dull data, dry documents and complex communications to life. Using our engaging visual communication templates, created by our expert in-house designers, Venngage users can easily create powerful visuals; no design experience required. Our easy-to-use drag and drop editor, alongside some helpful articles, videos and courses, will have you creating dazzling designs in minutes. Venngage has a wide range of templates perfect for business and professional communications including infographics, charts, reports, diagrams, mind maps, presentations, and more so that you can impress your boss, your clients, prospects and online audience.Starting Price: $10/month -
17
JointJS
client IO s.r.o.
JointJS is a powerful JavaScript diagramming library that helps developers and companies of any size build advanced visual and No-Code applications. It comes in two versions: open-source (JointJS) with limited features and professional (JointJS+), which extends the features of JointJS and offers a wide range of customizable features, ready-to-implement demo applications and white-glove support.Starting Price: $2990 per developer -
18
Cloudairy
Cloudairy
Cloudairy is a modern collaboration platform that simplifies the way teams visualize, share, and manage information. Designed for distributed teams and dynamic workflows, Cloudairy offers seamless cloud-based collaboration with real-time editing, version control, and secure sharing capabilities. Whether you're building flowcharts, documents, or templates, Cloudairy brings clarity to complexity and keeps your workspaces organized and actionable. Trusted by agile teams and professionals across industries, Cloudairy accelerates productivity through intuitive tools and deep integration with your favorite cloud services. From brainstorming to delivery, we help you work faster, communicate clearly, and scale effortlessly. Start collaborating with Cloudairy today — where your ideas take flight.Starting Price: $8/month -
19
ClickCharts
NCH Software
ClickCharts lets you design flowcharts and diagrams easily with this software. Quickly create strong visuals of an organization, process, mind map, UML diagram and more. Map out your value streams and data flow. Find bottlenecks in the process and ways to optimize productivity. Jump start the process with template options or start fresh with your choice of shapes, symbols, line connectors and more. Export to jpg, gif, png and more.Starting Price: $39.99/one-time -
20
Software Ideas Modeler
Software Ideas
Software Ideas Modeler is an essential tool in software engineering. It is a feature-rich CASE tool that can help you with software design using various diagram notations and modeling tools. Try our UML modeler, ERD designer, flowchart maker, wireframing tools, or BPMN editor for free. The diagramming modules are optimized for particular tasks in the specific domain. Tools for UML diagrams, Layer diagrams, Flowcharts, and Data Flow Diagrams and others help you design your software or its crucial parts properly. Documentation and glossary modules in our CASE tool allow you to communicate your design effectively. Professionally process the user requirements using Advanced Use Case analysis or User Stories depending on your preference. Turn code to diagrams using the code analytic tools for many popular programming languages. Generate source code scaffold and code parts using source code generators, also using custom code templates.Starting Price: $68 one-time payment -
21
Plectica
Plectica
Diagram your thinking in real time, together. For strategists, educators, technologists, designers, policy makers, and thinkers of all sorts! Based on years of applied research on how we think and learn, Plectica works the way the human brain does: by visually organizing parts that can be combined and connected to each other to form a more complete picture. Whether you're diagramming an internal workflow, brainstorming new opportunities, or onboarding new team members, our mission is to help you map and share better ideas. Plectics is a broad transdisciplinary science which explores the hallmark of complex systems: simple rules underlie and unfold into the complexity you wrestle with everyday. Changing the way people visualize & connect information. Plectica helps individuals and teams organize, explain, and collaborate on complex information. Plectica helps make things crystal clear whether you’re diagramming an internal system, brainstorming new products, or onboarding new members.Starting Price: $3 per month -
22
TeamFlow
TeamFlow
Create clear and consistent process diagrams. Make it easy for everyone in your organization to understand what's going on. Build a Process Repository for your organization. This gives your team a single source of truth for all your process documentation. With TeamFlow® your diagram is more than just a picture. Each diagram is a fully-featured graph data model of your process. TeamFlow® uses a universal data model giving you more than just a picture. Jump right in and create your process diagram in seconds. Drag and drop tasks, meetings, decisions and more to bring your process to life. Easily visualize your process with clean shapes and colors so that everyone in your organization can understand your process flows. TeamFlow® uses a simple and easy-to-understand design language so that your process diagrams have a consistent look each and every time. TeamFlow® is committed to privacy and security at every level.Starting Price: $10 per month -
23
Zapier Canvas
Zapier
Create a visual overview and diagram your team's most important processes so you can more easily understand and improve your business workflows. Onboard teammates, collaborate cross-functionally and ensure stakeholders have the right visibility into the flows that power your work. Build out critical processes with your team, then identify opportunities to automate or streamline your workflows with AI-powered suggestions. Plan, build, and visualize workflows with your teammates live or asynchronously. Add notes and context so your team can iterate while maintaining access control to stop accidental edits. Get a holistic view of how your workflows, apps, and teammates fit together. Share your diagrams and provide a view into the apps and automations that power your business—all from one place.Starting Price: $19 .99 per month -
24
DrawExpress Diagram Lite
DrawExpress
DrawExpress is a fast gesture-recognition diagram application. With DrawExpress, you can draw diagrams and flowcharts in a simple and intuitive way. It's just as easy as using a pen and paper. Whether you work in software design, finance, business, law, or need it for school, DrawExpress is the ultimate solution to your diagramming needs.Starting Price: Free -
25
Mermaid Chart
Mermaid Chart
Effortlessly create complex diagrams from markdown-style text and collaborate with your team in real time using Mermaid Chart. This innovative text-based diagramming tool, enhanced by Mermaid AI, streamlines documentation processes, enhancing workflows and communication across your team. The Teams feature enables you to create projects, invite members, and maintain a unified source of truth, significantly boosting collaboration and productivity. Elevate your diagramming capabilities with Mermaid AI by writing simple prompts to generate complete diagrams in seconds. Generate sophisticated diagrams using AI, text, and visual editing capabilities, revolutionizing the way you create and manage diagrams for a smarter, more efficient workflow.Starting Price: $6.67 per month -
26
Heptabase
Heptabase
Heptabase empowers you to visually make sense of your learning, research, and projects. To truly make sense of what you've learned, visualize your notes with whiteboards, sections, and mindmaps. Bring all your highlights, annotations, PDFs, journals, and research notes together to discover new insights. Manage complex projects with clarity and flexibility by using powerful tags and properties. And of course, full offline access with blazing-fast speed. Sync and access your notes across unlimited desktop devices, mobile devices, and web browsers. Access all notes and files without an internet connection. Search, load, and edit your notes with blazing-fast speed. Heptabase is a visual note-taking software specifically designed to help you learn and research complex topics, establishing a deep understanding of things you care about. The design of Heptabase focuses on helping you better "understand the topics you care about," rather than simply "taking more notes."Starting Price: $8.99 per month -
27
AutoDiagram
AutoDiagram
AutoDiagram is an AI-powered platform that transforms textual descriptions into professional-grade diagrams, streamlining the visualization process for professionals across various fields. Users can simply input their concepts in plain text, and the AI interprets the context to generate accurate visuals, supporting over 20 diagram types including flowcharts, ER diagrams, architecture maps, and sequence diagrams. The platform offers intelligent error prevention to ensure high-quality outputs and provides multiple export options such as SVG, PNG, and PDF for seamless sharing and collaboration. AutoDiagram is accessible through a free plan, allowing the creation of up to five diagrams per month, and a Pro plan at $9 per month for unlimited diagram creation and advanced features. We prioritize data security with industry-standard protocols and encryption measures to protect your diagrams and information.Starting Price: $9 per month -
28
Gleek
Gleek
Gleek is a text-to-diagram tool designed for developers to create various types of diagrams using only the keyboard, eliminating the need for a mouse. It supports a range of diagram types, including flowcharts, UML class and sequence diagrams, state machine diagrams, Gantt charts, user journey diagrams, and entity-relationship diagrams. Gleek uses a unique, intuitive syntax that allows users to quickly generate diagrams by describing them in text and offers tools for live collaboration and version control. The platform allows for easy customization of diagram design, export options, and the use of pre-designed templates. It is ideal for quickly visualizing software architectures, processes, and project plans. Gleek helps streamline the process of diagramming with a focus on simplicity, speed, and efficient collaboration, making it especially useful for software developers, project managers, and engineers.Starting Price: $6.95 per month -
29
PlantUML
PlantUML
PlantUML is a powerful and flexible open source tool that allows users to create UML diagrams using simple text descriptions. It supports various diagram types, including sequence, use case, class, component, state, and activity diagrams. PlantUML also extends beyond traditional UML with support for other diagram types such as Gantt charts, mind maps, and entity-relationship diagrams. The platform uses a straightforward syntax to generate high-quality diagrams, making it easy for developers, system architects, and project managers to visualize complex systems and processes. Users can export diagrams in multiple formats like PNG, SVG, LaTeX, and ASCII art. PlantUML is compatible with a range of tools and integrates seamlessly into documentation workflows, enhancing productivity for teams and individuals.Starting Price: Free -
30
ArgoUML
ArgoUML
ArgoUML is a free, open source UML modeling tool supporting all standard UML 1.4 diagrams. It is available on any Java platform and is translated into ten languages. ArgoUML allows users to create and edit various UML diagrams, including class, state, use case, activity, collaboration, deployment, and sequence diagrams. The software features a user-friendly interface divided into four panels: a project hierarchy, an editor for the selected diagram, a to-do list, and a detail panel for object selection. ArgoUML is distributed under the Eclipse Public License and is widely used worldwide, having been downloaded over 80,000 times. The platform offers user manuals, quick guides, and resources for both users and developers, and it encourages community involvement and contributions. ArgoUML’s open-source nature allows for bug reporting, feature requests, and active participation in its ongoing development.Starting Price: Free