17 Best FREE UML Diagram Tools & Software (2023) - The first knowledge sharing application in Vietnam

UML stands for Unified Modeling Language. It is a standard that is mainly used for creating object-oriented, meaningful documentation models for any software system present in the real world. It offers rich models that describe the working of any software/hardware system.

There are many tools available in the market for designing UML diagrams. Following is a curated list of the Top UML tools with popular features and the latest download links. This comparison list contains open-source as well as commercial tools.

Top Pick

EdrawMax

Edraw Max is a UML builder software that helps you to make diagrams using ready-made symbols and templates. It allows you to import your drawings to file formats such as PDF, PPT, Word, HTML, etc.

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Best UML Diagram Software & Tool (Open Source & Online)

EdrawMax is a UML builder software that helps you to make diagrams using ready-made symbols and templates. It allows you to import your drawings into file formats such as PDF, PPT, Word, and HTML.

#1 Top Pick

EdrawMax

5.0

Integration: Microsoft Visio, Dropbox, and Google Drive

Supported Diagrams: Flowchart, Mind Map, Org Chart, Gantt Chart, etc.

Multi-file Support: No

Free Trial: 15 Days Free Trial

Visit EdrawMax

Features:

You can create a flowchart, mind map, UML, electrical diagrams, network diagrams, etc.
It provides a user-friendly interface similar to MS Word.
This UML software helps you to create a Class diagram, Component Diagram, and composite structure Diagram.
EdrawMax helps you to share designs anytime, anywhere.
Allows users to re-use provided representations and work in total transparency on both DSL and UML models
This tool provides 280+ latest flowchart and diagram solutions.
Good usability gives the overall look and feel of a serious programming environment.
The tool provides an easy method for the transition from UML to domain-specific modeling.
Automate design reviews and generate documentation
Constantly added new features based on the feedback given by the users
It allows developers to embed modeling concept patterns, generation templates, and other abstractions in traditional code.
Offers pre-built templates for Marketing, Operating Model, HR and Mind Map
Seamlessly integrates with Microsoft Visio, Dropbox, and Google Drive
Free plan offers 20MB cloud storage
It provides multiple diagram options like 20MBl2
Supports PNG, JPG, SVG, PDF, Excel, Word, PowerPoint, Visio and HTML file formats
It Provides import/export options for SVG, PNG, JPG, ICO, BMP, HTML and Tiff
Offers 256-bit SSL encryption
Support programming language like C++ and Java
Provides Quick Access Toolbar, Ribbon, Canvas, Context Pane, Symbol Library, Gantt view and Cloud Collaboration
Offers Version history, Drag and Drop, and Print option
It provides customer support via Chat, Email, and Contact form
Supported Platforms: Windows, Mac, Linux, Web and iOS
Price: Plans start at $89 a year
Free Trial: 15 Days Free Trial

Visit EdrawMax

15 Days Free Trial

Adobe Express is a flowchart software that helps you design customized and streamlined flowcharts. It also allows you to save and share your flowchart diagrams.

Adobe Express

4.9

Integration: Canvas LMS

Supported Diagrams: Flowchart

Multi-file Support: Yes

Free Trial: Lifetime Free Basic Plan

Visit Adobe Express

Features:

Helps you resize your flowcharts in a fraction of the time.
You can build a flowchart that can be resized and reformatted for posters, infographics, emailers, etc.
Helps you to Collaborate with your engineering team
You can add animated stickers from GIPHY or apply a text animation for short-form graphic videos.
It is one of the best UML design tools, which has a straightforward and user-friendly interface for easy and fast development.
Allows you to instantly download or print your flowchart designs for home or office use.
This UML drawing tool helps system analysts to integrate the creation of data flow and business process diagrams.
Offers pre-built templates for Birthday card, Brochure, Business Card, Calendar, Certificate, Educational infographic, Facebook Cover, Flyer, Graph and Logo
Seamlessly integrates with Canvas LMS
Free plan offers 2GB cloud storage
It provides multiple diagram options 2GB cloud storage
Supports MP4, MOV, MPEG, MPE, MPG, M2V, MPA, MP2, M2A, MPV, M2P, M2T, MTS, M4V, M4A, VOB, 3GP, AVC and JPEG file formats
It Provides import/export options for AIFF, AIF, PNG, TIFF, JPEG and XML
Offers AES-256 encryption
Support programming language like C++ and Java
Provides Resize images instantly, Convert videos to GIFs, Trim and edit video clips, Crop video clips and Image Resize
Offers Version history, Multi-file support, Drag and Drop, and Print option
It provides customer support via Chat
Supported Platforms: Android, iOS, Windows, Mac, Linux
Price: Plans start at $9.99 a month. 16% Discount on Yearly Payment.
Free Trial: Lifetime Free Basic Plan

Visit Adobe Express

Lifetime Free Basic Plan

Lucidchart is HTML-5-based UML tool that also offers real-time collaboration capabilities. It is one of the best UML modeling tools that allow you to create a simple flowchart to complex technical diagrams.

Lucidchart

4.8

Integration: Salesforce, Slack, AWS, Azure, Zapier, Quip and Asana

Supported Diagrams: UML, Class, Activity and Sequence

Multi-file Support: Yes

Free Trial: Lifetime Free Basic Plan

Visit Lucidchart

Features:

Works with your team on any device across various platforms
Allows you to connect live data with your diagrams or import data to automatically build organization charts
Helps you to increase security and easily manage user accounts
Offers pre-built templates for Brainstorm Ideas, Build Flowcharts, Design UI & Layouts, Develop Business Strategy, and more
Seamlessly integrates with Salesforce, Slack, AWS, Azure, Zapier, Quip and Asana
Free plan offers 25MB cloud storage
It provides multiple diagram options 25MB cloud storage
Supports CSV, SVG, PNG, JPG and PDF file formats
It Provides import/export options for CSV, SVG, PNG, JPG and PDF
Offers AES-256, and TLS 1.2 encryption
Support programming language like Python, Java, and C++
Provides Real-time collaboration, Automated diagramming, Enhanced security and Visio, Gliffy, Omnigraffle import
Offers Multi-file support, and Drag and Drop
It provides customer support via Contact form and Chat
Supported Platforms: Android, Windows and iOS
Price: Plans start at $8.34 a month.
Free Trial: Lifetime Free Basic Plan

Visit Lucidchart >>

Lifetime Free Basic Plan

Creately helps you create UML modeling, design, and architecture with advanced technology.

Creately

4.7

Integration: Google Drive, Slack, Confluence, Zapier, OneDrive etc.

Supported Diagrams: ER, UML, Class, Sequence, Use Case and Flowchart

Multi-file Support: Yes

Free Trial: Lifetime Free Basic Plan

Visit Creately

Features:

Provides an intelligent, standard-compliant UML shape.
You can easily add UML shapes to your canvas using drag-and-drop tools.
Allows you to visualize objects, attributes, classes, actors, packages, etc., on a single connected workspace.
Provides real-time collaboration for team design sprints.
Tools like universal, full-text search help you quickly find specific nodes and information in large and complex UML diagrams.
Allows you to add notes, link models, and centralize design documents.
Offers pre-built templates for Marketing, Operations, Strategy, IT & Networking, HR, Education, Product and Engineering
Seamlessly integrates with Google Drive, Slack, Confluence, Zapier, OneDrive and Microsoft Teams
Free plan offers 100MB cloud storage
It provides multiple diagram options 100MB cloud storage
Supports JPEG, PNG and SVG and PDF file formats
It Provides import/export options for PDF, SVG, CSV, PNG, JPEG, BMP, GIF and ICO
Offers AES-256, and TLS 1.2 encryption
Provides Visual Workspaces, Custom Databases, Task Management, Multi-Player Collaboration, Wiki & Notes
Offers Version history, Multi-file support, Drag and Drop, and Print option
It provides customer support via Email, Phone and Contact Form
Supported Platforms: Android, Windows and iOS
Price: Plans start at $6.95 a month. 40% Discount on Yearly Payment.
Free Trial: Lifetime Free Basic Plan

Visit Creately >>

Lifetime Free Basic Plan

Microsoft Visio is a popular chart and visualization software. It belongs to the office family, so it can easily be integrated with other Microsoft office products.

Features:

Visio helps you to create professional diagrams by creating flowcharts, diagrams, org charts, engineering designs, and more.
Comprehensive software for professional modeling.
It is a useful data, process, and engineering modeling tool
Allows you to build professional-looking diagrams
Allows you to connect flowcharts and diagrams to real-time data.
It allows you to work together on diagrams from a web browser, from almost anywhere.
Offers pre-built templates for Brochures, Budgets, Calendars, Cards, Certificates, Decoration, Education, Flyers, Health, fitness, Invitations and Letters
Seamlessly integrates with Yammer, Splunk and Secureworks
Free plan offers 2GB cloud storage
It provides multiple diagram options 2GB cloud storage
Supports JPEG, PNG, PDF and DOC file formats
It Provides import/export options for TXT, CSV, Excel, MP4 and MOV
Offers AES-256, AES-192, AES-128-bit, DES-64-bit and 3DES-192-bit encryption
Support programming language like PHP, Python, C# and ASP.NET
Provides Collaboration and sharing, Intelligent diagramming, User experience and features, Templates, stencils, and shapes, Accessibility, and more
Offers Version history, Multi-file support, Drag and Drop, and Print option
It provides customer support via Chat and Phone
Supported Platforms: Android, Windows and iOS
Price: Plans start at $5.00 a month.
Free Trial: 30 Days Free Trial

Visit Visio >>

30 Days Free Trial

#6) Moqups

Moqups is an online tool that enables you to make flowcharts, and UML diagrams with minimal effort. It allows you to drag and drop shapes to visualize any flow.

Moqups

4.5

Integration: Drive, Dropbox, Box, Slack, Jira and Confluence

Supported Diagrams: Flowcharts, mind maps, storyboards, process maps, etc.

Multi-file Support: Yes

Free Trial: 90 Days Free Trial

Visit Moqups

Features:

You can collaborate easily with other people.
Easy to share your project link with stakeholders.
Includes numerous shapes and drawing arrows.
You can resize, rotate, and move shapes.
Offers pre-built templates for Wireframes & Mockups, Diagrams & Flowcharts, Charts & Graphs And Business Strategy
Seamlessly integrates with Drive, Dropbox, Box, Slack, Jira and Confluence
Free plan offers 25MB cloud storage
It provides multiple diagram options 25MB cloud storage
Supports JPEG, PNG, GIF, SVG and WEB file formats
It Provides import/export options for PNG, PDF, HTML, JPEG, PNG, GIF, SVG and WEBP
Offers 2FA encryption
Provides Wireframe Tool, Flowchart Maker, Graph Maker, Extensive range of Fonts & styling options, and more
Offers Multi-file support, Drag and Drop, and Print option
It provides customer support via Contact form
Supported Platforms: Windows
Price: Plans start at $17 a month. 22% Discount on Yearly Payment.
Free Trial: 90 Days Free Trial

Download link: https://moqups.com/

#7) ConceptDraw

ConceptDraw DIAGRAM offers a complete range of business graphic documentation solutions. These UML solutions offer business-specific add-ons which offer an extensive variety of workflow requirements.

Features:

ConceptDraw DIAGRAM v12 offers powerful and comprehensive drawing tools.
Helps you to empower your communication processes and improve your presentation techniques.
The tool is an ideal suite for building plan software.
You can use very important business metrics and track them with live object technology.
Offers pre-built templates for Calendar and Organizational
Seamlessly integrates with PowerPoint, Adobe Acrobat DC, Concept Draw MINDMAP, and Concept Draw Project
It provides multiple diagram options cloud storage
Supports PNG, JPG, VSD and XML file formats
It Provides import/export options for PNG, JPG, BMP, GIF, TIFF, PDF, HTML and SVG
Offers AES-256 encryption
Support programming language like C, C++, C#, Java, Lisp and Python
Provides Custom Diagramming Solution Builder, Sophisticated Diagramming Tools, Format Tools, Hyperlinks and Text Notes
Offers Multi-file support, Drag and Drop, and Print option
It provides customer support via Ticket and Phone
Supported Platforms: Windows and Mac
Price: Plans start at $199 a month.
Free Trial: 21 Days Free Trial

Download link: https://www.conceptdraw.com/products/drawing-tool

#8) StarUML

StarUML is a UML diagram modeling tool. It is one of the best UML software that provides eleven types of diagram. StartUML 2 is compatible with UML 2.x versions.

Features:

This UML diagram software allows you to discover and install third-party extensions.
No limit to using this commercial software for evaluation.
Offers pre-built templates for Class Diagram
It provides multiple diagram options cloud storage
Supports JSON, PNG, HTML and JPEG file formats
It Provides import/export options for PDF, XML, PNG, JPEG, HTML and SVG
Support programming language like C, C++, C#, Java and Python
Provides Custom Uml Profile, Auto Update, Model-driven Development, Fast Modeling, Dark And Light Themes and Code Markdown Support
Offers Multi-file support, Drag and Drop, and Print option
It provides customer support via Email
Supported Platforms: MacOS, Windows and Linux
Price: Request a Quote from Sales
Free Trial: Lifetime Free Basic Plan

Download link: http://staruml.io/

#9) Altova

Altova UModel is another useful UML tool that makes visual software design practical for any project. Visually design application models in UML, which can be generated using Java, C++, C#, or Visual Basic.

Features:

Intuitive Visual Modeling for all UML Diagrams
Helper windows allow you to build your desired models.
It allows you to add hyperlinks to any element in any UML diagram.
You can assign an element to a specific layer, and layers can be locked to prevent changes.
Offers pre-built templates for DITA, DocBook, NCAXML, NewsML, NITF, RIXML, DAISY, TEI, P3P and XMLResume
Seamlessly integrates with Visual Studio and Eclipse
It provides multiple diagram options cloud storage
Supports JSON, XBRL, XSL, XML, XPath, XSLT and HTML file formats
It Provides import/export options for Excel, XML, CSV, ISO, HTML, Text, PNG, RTF and PDF
Offers AES-256 encryption
Support programming language like Java, C++, C# and Visual Basic
Provides XML Editing & Validation, Project management support, Barcode support, Built-in Industry Standards Templates, and more
Offers Version history, Multi-file support, Drag and Drop, and Print option
It provides customer support via Contact form
Supported Platforms: MacOS, Windows and Linux
Price: Plans start at $155.42 a one time purchase.
Free Trial: 30 Days Free Trial

Download link: https://www.altova.com/umodel

#10) Visual Paradigm

Visual Paradigm is a software design tool that is tailored for engine software projects. This UML editor tool helps the software development team to model business information systems and development processes.

Features:

It offers a complete tool like for process analysis, system design, database design, etc.
Offers user story feature to capture and maintain users’ needs.
Offers pre-built templates for Social Media, Events, Business, Marketing, Documents, School, Personal, Infographics, Posters and Gift Card
Seamlessly integrates with Eclipse, NetBeans, IntelliJ IDEA, Visual Studio and Android Studio
Free plan offers 1GB cloud storage
It provides multiple diagram options 1GB cloud storage
Supports JPG, PNG, SVG, TIFF, EMF, PDF and DOC file formats
It Provides import/export options for JPG, PNG, SVG, TIFF, EMF, PDF and XML
Offers 256-bit SSL encryption
Provides Visual Modeling, Enterprise Architecture, Business Analysis & Design, Project Management, Agile & Scrum Development, Online Diagram Tool, Spreadsheet Tool, and Team Collaboration
Offers Multi-file support, Drag and Drop, and Print option
It provides customer support via Contact form
Supported Platforms: MacOS, Windows, iOS and Linux
Price: Plans start at $6 a month.
Free Trial: 30 Days Free Trial

Download link: https://www.visual-paradigm.com/

#11) Draw.IO

Draw.IO is a free online UML tool. It is one of the best UML tools that allows users to create and manage the drawing easily these tools. A lot of the wide and early share is available with this tool.

Features:

No limit on the number of sizes
Templates are present in the software design itself.
This free UML diagram tool allows you to save the model in your preferred location
Offers pre-built templates for diagram
Seamlessly integrates with Aha, Atom, Bioiocons, BookStack, Docstell, FOSWiki, Grafana, Growi, JupyterLab, Lark, LumApps, Nextcloud, Nuclino, Redmine and Sandstorm
It provides multiple diagram options cloud storage
Supports PNG, JPEG, SVG, JSON, XML, CSV and PDF file formats
It Provides import/export options for PNG, JPEG, SVG, JSON, XML, CSV and PDF
Offers firewall based encryption
Provides Keep your diagram data secure, Diagram wherever you want, Collaborate in real-time with shared cursors, Easy-to-use diagram editor, and Many advanced tools
Offers Version history, Drag and Drop, and Print option
It provides customer support via Email and Phone
Supported Platforms: Android, MacOS, Windows, iOS and Linux
Price: Plans start at $15 a month.
Free Trial: Lifetime Free Basic Plan

Download link: https://www.draw.io/

#12) GenMyModel

GenMyModel began as a UML tool but today, it has expanded to cover also business modeling with Archimate and BPMN support. It offers a centralized model repository which allows easy and simultaneous model collaboration.

Features:

Share your knowledge with versioning and access right management.
Useful for presentations to management and project stakeholders.
Helps you to combine the power of desktop modeling tools with a modern web solution.
Offers pre-built templates for Design
Seamlessly integrates with Jira and Confluence
It provides multiple diagram options cloud storage
Supports SVG, PNG, JPEG, XML and PDF file formats
It Provides import/export options for XML, SVG, PNG, JPEG, PDF and XSD
Offers AES encryption
Support programming language like C++ and Java
Provides Easy to use, A Modeling Toolkit, Cloud-native, Collaborative, Online repository, Multi-standards, Code-free customization, and Effortless documentation
Offers Version history, Multi-file support, Drag and Drop, and Print option
It provides customer support via Ticket, Email and Phone
Supported Platforms: MacOS, Windows and Linux
Price: Lifetime Free Web Version

Download link: https://www.genmymodel.com/

#13) Astah

Astah is a UML editor which is integrated with Mind mapping features. It is one of the best UML tools that helps you to visualize the essence of your ideas before you code.

Features:

Faster to create UML compares with Excel or non-UML-specific drawing tools.
Visualize requirements and functional requirements and all the relations between them and other model elements.
Merge, exclusive control, copy & paste support.
Seamlessly integrates with Miro, ClasHStamP, Confluence, DSM, Jira and FreeMInd
Free plan offers 2GB cloud storage
It provides multiple diagram options 2GB cloud storage
Supports XML, PNG and Excel file formats
It provides import/export options in XML, Excel, PNG, RTF, SVG, EMF, JPEG and CSV formats
Support programming language like Java, C++ and C#
Provides Simplicity, quality, Easy to use, Extensive add-on library, and Abundant online content
Offers Version history, Multi-file support, Drag and Drop, and Print option
It provides customer support via Contact form
Supported Platforms: MacOS, Windows and Linux
Price: Plans start at $5.99 a month. 85% Discount on Yearly Payment.
Free Trial: 20 Days Free Trial

Download link: http://astah.net/

#14) Visual Modeling Software

Microfocus is a visual modeling tool that allows business and software development to analyze and design software architecture.

Features:

This platform offers you to model enterprise architectures in such a way that requirements, architectures, and code are always in sync
Offers Model-driven Architecture and data modeling systems
Livesource technology feature allows you to use programming language source code to manage elements and eliminate unnecessary work
Offers pre-built templates for Design and Report
Seamlessly integrates with Kubernetes, Microsoft Teams, LoadRunner, Git, IBM and Jira
It provides multiple diagram options cloud storage
Supports TIFF, JPEG, PNG, GIF, BMP, PDF, XLS and RTF file formats
It Provides import/export options for XDB, WSF, IXF, CSV, Excel and XML
Offers AES-256 and 2FA encryption
Support programming language like Java, C++ and Visual Basic
Provides Leading-Edge Modeling Platform, Unified Modeling Language, LiveSource Technology, Model Visualization, Synchronization, and Design Patterns
Offers Version history, Multi-file support, Drag and Drop, and Print option
It provides customer support via Chat, Phone and Contact form
Supported Platforms: MacOS, Windows and Linux
Price: Request a Quote from Sales

Download link: https://www.microfocus.com/en-us/products/together/overview

#15) Sparx Systems

Sparx system is a diagram design tool for modeling documenting, building and maintaining object-oriented features. It is one of the leading vendors of innovative solutions based on the Unified Modeling Language.

Features:

Helps you with effective project management
High-performance model repository
Offers End-to-end traceability
Powerful document generation
Offers pre-built templates for Design, Document and Code
Seamlessly integrates with Application Lifecycle Management, Jazz, Jira & Confluence, Team Foundation Server, Wrike, Service Now, Autodesk, Bugzilla, SharePoint and Dropbox
Free plan offers 2GB cloud storage
It provides multiple diagram options 2GB cloud storage
Supports XML, PDF and HTML file formats
It Provides import/export options for XML, XMI, CSV, RTF, PDF and HTML
Offers 2FA encryption
Support programming language like JavaScript, Java, C++ and C#
Provides Traceability, Source code roundtrip, Application visualization, Model-driven architecture, Debugging and visualization, and Automation
Offers Version history, Multi-file support, Drag and Drop, and Print option
It provides customer support via Email, Phone and Contact Form
Supported Platforms: MacOS, Windows, iOS and Linux
Price: Plans start at $8 a month. 25% Discount on Yearly Payment.
Free Trial: 30 Days Free Trial

Download link: https://sparxsystems.com/

#16) Gliffy

Gliffy is a free online drawing tool that provides support for drawing UML diagrams. It is one of the most widely used online diagramming applications.

Features:

Allows you to draw a diagram with ease
This free UML tool offers the power of visual communication and collaboration.
Strong support for BPMP process models
Seamlessly integrates with Confluence, Atlassian and Jira
It provides multiple diagram options cloud storage
Supports PNG, JPG, SVG and GIF file formats
It Provides import/export options for JPEG, PNG, VSDX, VDX, JPG, GIF and SVG
Offers AES-256, and TLS 1.2 encryption
Provides Create with Ease, Collaborate Instantly, Share With Anyone, and Cloud-Fortified Collaboration
Offers Version history, Multi-file support, Drag and Drop, and Print option
It provides customer support via Contact form
Supported Platforms: Windows and MacOS
Price: Plans start at $8 a month. 25% Discount on Yearly Payment.
Free Trial: 14 Days Free Trial

Download link: https://www.gliffy.com/

#17) Modelio

Modelio is the first modeling environment. The tool combines BPMN support and UML support. It is one of the best free UML tools that provide support for a wide range of models and diagrams. It is accessible to the user as an open-source UML diagram tool for developing UML diagrams.

Features:

Modelio offers an XMI import/export feature that enables you to exchange UML2 models between various tools.
It is one of the best open-source UML tool that offers you to export diagrams in SVG, Gif or JPEG format.
You can extend Modelio for any language, methodology, or modeling technique.
It is a free and open-source HTML5 online flowchart software
You can work on UML 2.5 models.
Seamlessly integrates with Eclipse
It provides multiple diagram options cloud storage
Supports PNG, JPEG, WMF, XML, GIF and BMP file formats
It Provides import/export options for XML, XMI, EMF, PNG, JPEG and BMP
Support programming language like C++, C#, Java and SQL
Provides UML Modeler, BPMN support integrated with UML, Java code generator, HTML model publishing, Extension system, and Scripting language support
Offers Multi-file support, Drag and Drop, and Print option
It provides customer support via Contact form
Supported Platforms: MacOS, Windows and Linux
Price: Free Download

Download link: https://www.modelio.org/

#18) Software Ideas Modeler

Software Ideas Modeler is a designing tool for drawing UML, SysML, ERD, ArchiMate, and flowcharts. It is one of the best free UML tools that allows you to create user stories and offers wireframe support.

Features:

This UML modeling tool offers easy Diagramming and Layout.
Software Ideas Modeler tool offers you many predefined styles, making your diagrams more attractive.
Documented software has better maintainability.
Offers pre-built templates for Source code and Documentation
Seamlessly integrates with GIT
It provides multiple diagram options cloud storage
Supports DF, DOCX, RTF, HTML, ODT and TXT file formats
It Provides import/export options for BMP, PNG, JPG, GIF, TIFF, SVG, WMF, EMF, XMI and PDF
Offers AES-256 encryption
Support programming language like C#, VB.NET, Java, C++, Action Script, JavaScript, PHP, Ruby, Python and SQL
Provides Wireframing, Matrices, Auto scrolling, Configurable canvas, Diagram filtering, Source code parsing and Styling
Offers Version history, Multi-file support, Drag and Drop, and Print option
It provides customer support via Email
Supported Platforms: MacOS, Windows and Linux
Price: Plans start at $62 a month.
Free Trial: Lifetime Free Basic Plan

Download link: https://www.softwareideas.net/

FAQs

UML Diagram is a design standard mainly used for creating object-oriented and meaningful documentation models for any software system in the real world. It offers rich models that describe the working of any software/hardware system. UML stands for Unified Modeling Language.

If you want to learn about UML Diagram, here’s a free tutorial you’ll want to check out: UML Diagrams: History, Types, Characteristics, Versions, Tools

Following are some of the best UML modeling software:

EdrawMax
Adobe Express
Lucidchart
Creately
Microsoft Visio
Moqups
ConceptDraw
StarUML

You should consider the following factors while choosing the best UML diagram software:

It should allow you to create multiple types of diagrams
Easy-to-use user interface
Customizations offered
Features and functionalities offered
Collaboration features
Integration with other tools
Cross-platform support
Templates offered for easy creation of diagrams
Presentation features
Import-Export functionality to various file formats