10 Best Diagramming Software of 2026

Lucidchart is the most balanced diagramming tool on this list for teams that draw a mix of flowcharts, process maps and architecture diagrams. The free plan is a sampler: 3 editable documents, 75 shapes per document and 100 templates, though it already includes basic data linking, commenting and presentation mode. Individual, at $9 per month billed yearly, removes the document and object limits and adds Visio import and export, premium shape libraries and 1 GB of storage. Team, at $10 per user per month billed yearly, is the plan most groups need, because it adds revision history with versioning, Call others to me, password protected publishing and integrations with Microsoft 365, Confluence, Jira, LeanIX and Ardoq. Enterprise adds team hubs, SAML, sharing restrictions, Salesforce integration and Lucidspark for whiteboarding. The trade-offs are a tight free tier and a trial that needs a card, so plan a short evaluation.

draw.io is the default free choice for technical diagrams. The web and desktop apps are free forever, need no sign-up and store files wherever you point them, such as Google Drive, OneDrive, SharePoint, GitHub or a local disk, and the company says it cannot access your data. It integrates with Google Docs and Slides, Microsoft Teams, Confluence and Jira, VS Code and Notion, and diagrams can be embedded as interactive viewers or exported to SVG, PNG and PDF. Real-time collaboration with shared cursors is included, and the source code is Apache 2.0 licensed, so there is no paid tier for features like SSO. draw.io reports more than 100 million users and says files from 2005 still load today. The limits are what a free tool skips: no hosted team workspace with admin controls, a plainer interface than Lucidchart or Miro, and community support rather than a help desk.

Visio remains the reference tool for formal diagrams in Microsoft-centered companies. Many teams already have Visio in Microsoft 365 through their commercial plan, which covers basic flowcharts, viewing and real-time collaboration in the web app and in Teams. Plan 1, at $5.00 per user per month paid yearly, adds thousands of shapes and Microsoft product icons, cross-functional flowcharts, network diagrams, Azure and AWS architecture diagrams, ERD and UML 2.5, layers and containers, shape data and Power BI integration. Plan 2, at $15.00, adds the desktop app with offline files, more than 250,000 shapes, BPMN 2.0, P&ID, electrical diagrams, floor plans, two-way data sync and AutoCAD file support. Both plans offer a one-month free trial and annual or monthly commitment. The interface is denser than browser-first tools, Plan 1 is web only, and the value depends on how much of the company already runs on Microsoft 365.

Miro started as a whiteboard but now has a full diagramming toolset, which makes it a good fit when diagrams grow out of workshops. Its diagram builder includes more than 2,000 shapes across UML, Kubernetes and Google Cloud, layers for multi-level diagrams, custom shape packs and AI that turns a text prompt into a flowchart, UML, ER diagram or process map. You can import existing work from Visio, draw.io and Lucidchart, or paste Mermaid and PlantUML code through apps. The free plan creates unlimited boards, but only the 3 most recent stay editable. Starter, at $8 per member per month billed yearly, adds unlimited private boards, visitor editing and high-resolution exports, plus 25 AI credits per member each month. Business, at $20, adds unlimited guests and private workspaces. Miro is less suited to strict notations and offline work than Visio, and large boards can feel busy for people who only need a clean diagram.

Whimsical is the quickest way on this list to get a tidy flowchart in front of a team. Flowcharts, mind maps, wireframes and docs share one workspace, and AI tools generate flowcharts, mind maps and wireframes from a prompt for you to edit. The free plan includes unlimited boards, members and guests, but it caps creation at 50 board objects and 50 doc blocks per month and adds a watermark to exports, so it works for evaluation rather than daily use. Pro, at $10 per editor per month billed annually, removes those limits and extends version history to 90 days. Business, at $20, adds private teams, SAML SSO, SCIM and unlimited history. Viewers and guests never need a paid seat, which keeps costs tied to the people who draw. The trade-off is depth: Whimsical has no large engineering or cloud shape libraries, so network and infrastructure diagrams are better done in Lucidchart, Visio or draw.io.

SmartDraw is a long-running Visio alternative that covers more than flowcharts. It ships with thousands of industry-standard symbols, lets you add data such as product numbers and costs to shapes and then generate manifests, and can build org charts from Entra ID and architecture diagrams from AWS and Azure. Its AI generates floor plans, flowcharts, org charts, mind maps and timelines from a prompt. For IT, it supports SSO provisioning and saving files to your own storage. Pricing is simple: Individual is $7.95 per month and Team is $6.95 per user per month, both billed annually, with a 3 user minimum on Team. Those are introductory prices for new customers against a listed $10.95, so check the renewal cost before you commit. There is no permanent free plan. SmartDraw suits companies that mix process diagrams with floor plans and site plans, which most diagramming tools on this list do not handle.

Visual Paradigm Online is the low-cost choice for people who draw formal software and architecture diagrams. Every plan includes unlimited diagrams and shapes, and the suite covers more than 200 diagram types, with a VPasCode editor for PlantUML, Mermaid and Graphviz. The free plan is limited to non-commercial use. Starter, at $4 per user per month billed annually, adds commercial rights, watermark-free and high-resolution exports and basic collaboration. Advance, at $9, adds diagram revisions and fuller team collaboration, and Combo, at $15, adds the wider AI suite and tools such as a flipbook maker and form builder. Deluxe, at $30, includes an AI diagram chatbot trained on more than 40 diagram types, from UML and ERD to C4, SysML and ArchiMate. Visio stencils and drawings can be imported. The trade-offs are a crowded interface and small live collaboration limits on the cheaper plans: 3 participants on Starter and 5 on Advance.

Eraser is built for engineers who document software architecture. You can paste a prompt, drop in Terraform or upload a design doc, and Eraser lays out a diagram that you then refine on a visual canvas or through AI chat. Diagram-as-code, markdown notes and more than 3,000 tech icons are on every plan, and integrations cover GitHub, Notion, Confluence and VS Code, plus an MCP server so AI clients can create and update diagrams. The free plan allows 3 files and 3 AI credits. Business, at $45 per member per month billed annually or $60 monthly, adds unlimited files, 100 AI credits a month, one Git repo and one data source, private files and unlimited version history. Business Plus, at $42 per member with a 10 seat minimum, adds SAML SSO and more connected sources. Guests are free on every plan. The price is high for general diagramming, and the tool is aimed at technical diagrams rather than org charts or business processes.

Gliffy is a focused pick for Confluence teams. Its main product, Gliffy Diagrams for Confluence, puts the editor inside Confluence pages, so flowcharts, UML, BPMN, network and Mermaid diagrams sit next to the documentation they explain and inherit Confluence permissions. It imports Visio and draw.io files, exports to JPEG, PNG and SVG and includes an AI feature that generates diagrams. Pricing is low: free with no time limit for up to 10 users, then $3.80 per user per month for 11 to 100 users, billed annually through Atlassian Marketplace. A Zero Egress edition, priced from $2.80 per month, is built for teams on Atlassian Government Cloud or Isolated Cloud and keeps diagram data inside the Atlassian environment, with ITAR, GDPR, HIPAA and SOC 2 compliance listed. The limit is scope: Gliffy only makes sense if Confluence is your documentation home, and it offers less for live workshops or standalone diagram libraries than Lucidchart or Miro.

Creately has grown from a diagramming app into a set of visual products. Its workspace keeps an infinite canvas with all diagram types and a real-time whiteboard, while Process maps work in BPMN 2.0 or swimlane flowcharts and can pull procedures out of PDF and Word files with AI. Atlas builds org charts from CSV imports, and Blueprint maps cloud systems. The free plan includes every diagram type and the AI tools, but caps diagrams at 45 shapes. Pro removes shape limits and adds exports to PDF, SVG, PNG and JPEG, private links and one connected data source refreshed daily. Business adds unlimited data sources, admin roles, an audit log and priority support. Enterprise is needed for advanced features in each product, plus SAML SSO, SCIM and data residency. We could not confirm Pro and Business prices in US dollars on the date checked, so treat the cost as pending and confirm it on the vendor's page.