Best Diagram Software in 2026

Lucidchart is the diagramming product of Lucid Software, which also sells the Lucidspark whiteboard and airfocus, a product-management and roadmapping tool. Lucid reports more than 100 million individual users in over 180 countries and states that 99% of Fortune 500 companies use its products; customer logos on its site include Google, Amazon, Intel, Philips, Nvidia and General Electric.

Lucidchart is browser-based and covers flowcharts, org charts, network and cloud-architecture diagrams, process maps and entity-relationship diagrams, with real-time co-editing, data linking and AI-assisted diagram generation. Paid add-ons extend it for particular jobs: Process Accelerator for process documentation, Cloud Accelerator for generating and visualising cloud infrastructure, and Enterprise Shield for data-security controls. Lucid ranked 13th on Okta's 2026 list of most popular applications, an indicator of how widely it is deployed through enterprise single sign-on.

Its main strengths are breadth and familiarity in large organisations. Weaknesses are that the free plan is restrictive and that advanced capabilities are sold as add-ons. Lucid's pricing page did not render for this review, so plan prices are not quoted here; buyers should check the current per-user rates directly.

Visio is Microsoft's diagramming application and the format many engineering, facilities and IT departments still standardise on. It is sold as two subscriptions. Visio Plan 1 costs US$5 per user per month on annual billing and provides Visio for the web only, with 2 GB of OneDrive storage, templates and shapes, Teams collaboration and Power BI embedding.

Visio Plan 2 costs US$15 per user per month on annual billing and adds the desktop application for up to five PCs, Export to Word, Data Visualizer for Excel, Slide Snippets for PowerPoint, and the ability to connect diagrams to external data and embed them in Power BI dashboards.

Visio is the natural choice in organisations that run on Microsoft 365, because its files open in Teams and SharePoint and it supports the .vsdx format that other tools import. Its limitations are that the full desktop application runs only on Windows PCs, real-time collaboration is less fluid than in browser-native tools, and the web-only plan lacks the data-linking features many technical users want.

draw.io, also served as diagrams.net, is a free diagramming application whose source code is licensed under Apache 2.0. Its website credits draw.io Ltd and draw.io AG, and describes the company as private and not venture-capital funded. The online editor needs no sign-up and the project advertises "no paywalls".

A distinguishing design choice is storage: draw.io does not store diagrams itself. Users save to their own Google Drive, OneDrive, SharePoint, GitHub or local disk, and the company states it cannot access the data. Integrations include Google Docs and Slides, Microsoft Teams, a VS Code extension, a Notion browser extension, and apps for Confluence and Jira.

draw.io covers flowcharts, UML, network, cloud-architecture and ER diagrams with large shape libraries, making it the default free alternative to Visio and Lucidchart. Its interface is less polished, real-time collaboration depends on the chosen storage back end, and the free product carries no vendor support commitment.

Miro is a collaborative online whiteboard that has added structured diagramming, so it is often evaluated against Lucidchart and Visio. The paid plans add specialised shape packs and custom shapes, more than 4,700 shapes for Mermaid, UML, AWS and BPMN diagrams, Visio and Lucidchart import, Mermaid diagrams on the canvas, and an AWS Cloud View and cost calculator.

Pricing is published in US dollars: a Free plan, Starter at US$8 per member per month billed yearly, Business at US$20 per member per month billed yearly with a 14-day trial, and a custom-priced Enterprise plan from 30 members. Annual billing saves 20% over monthly. The free plan allows unlimited boards but only the three most recent remain editable, with 10 AI credits a month.

Miro's strength is mixing free-form workshops and precise diagrams on one canvas, with 250+ integrations and 7,000+ templates. For dense technical diagrams such as detailed network maps, a dedicated tool is usually faster, and specialised shape libraries sit behind the Business plan.

FigJam is the online whiteboard of Figma, the interface-design platform. It is used for flow diagrams, user journeys, architecture sketches and workshop boards, and its main advantage is that it sits beside design files that product teams already use.

FigJam is not sold as a separate product: access comes through Figma seats. The cheapest is the Collab seat, which includes full access to FigJam, at US$3 per month on Professional and US$5 on Organization and Enterprise; Full seats cost US$16, US$55 and US$90 per month respectively. The Starter plan is free with limited access to Figma products. Organization and Enterprise are billed annually.

FigJam is best for product and design teams. It has fewer formal diagram notations than Visio or Lucidchart, and organisations without Figma gain less from its integration.

Creately is a visual collaboration platform that combines an infinite canvas covering all diagram types with data-connected products named Atlas, Process, Blueprint, Compass and Clinical Maps. Its Pro and Business plans can connect diagrams to external data sources, refreshed daily on Pro and unlimited on Business, which lets an org chart or process map update from a spreadsheet or system of record.

The Free plan includes real-time collaboration but caps diagrams at 45 shapes and disallows image and PDF export, private links and email invitations. Pro removes the limits and adds exports and sharing controls; Business adds admin controls, roles, an audit log and priority support; Enterprise adds SAML SSO, SCIM, SLAs and data residency.

Creately suits teams that want diagrams linked to data. Its pricing page lists currencies (USD, EUR, AUD) but did not display Pro and Business amounts in the version reviewed, and the free plan's shape cap makes it impractical beyond trials.

Whimsical combines boards for flowcharts, mind maps and wireframes with a document editor. Its design emphasises speed and a constrained visual style, which produces consistent-looking diagrams with little formatting effort.

Prices are published per editor per month: Pro US$10 billed annually (US$12 monthly) and Business US$20 (US$24 monthly). Viewers and guests are free and unlimited on every plan. The Free plan allows 50 board objects and 50 doc blocks per month, watermarks exports and keeps seven days of version history; Business adds private teams, SAML SSO, SCIM and unlimited history.

Whimsical is well suited to product managers and start-ups producing quick flows and wireframes. It lacks the engineering notations, data linking and Visio compatibility that technical diagramming requires.

Gliffy is a diagramming product best known as an app for Atlassian Confluence. Its website footer names Perforce Software Inc. as copyright holder, indicating Perforce ownership.

For Confluence, Gliffy is free for up to 10 users with no time limit and costs US$3.80 per user per month, billed annually, for 11–100 users; larger deployments are quoted by sales, and purchases run through the Atlassian Marketplace. A "Zero Egress" edition is listed from US$2.80 per month. Evaluations last 30 days on Confluence Cloud and Data Center. A standalone Gliffy Online product also exists.

Gliffy is a practical choice for teams whose documentation lives in Confluence and who want diagrams to render and version inside pages. Outside Atlassian it has little advantage, and its feature set is narrower than Lucidchart's.

SmartDraw is a long-established diagramming application; its website copyright runs from 1994. The company describes its focus as scaled drawings, with floor plans the main use, alongside flowcharts, org charts, mind maps, timelines and technical and IT diagrams. AI features generate floor plans and other diagrams from a text prompt.

SmartDraw integrates with Microsoft and Google tools, can build org charts from Entra ID and architecture diagrams from AWS and Azure, offers an MCP server and data visualisers, saves files to a customer's own storage and supports SSO provisioning.

SmartDraw is unusual in combining office diagramming with dimensioned drawings, which makes it useful for facilities and real-estate teams that do not need full CAD. Its interface is less collaborative than browser-first rivals. The pricing page could not be opened for this review.

Cacoo is an online diagramming tool from Nulab. Nulab says Cacoo is used by more than 4 million users worldwide. It offers flowcharts, wireframes, network and AWS diagrams with real-time co-editing and comments.

Pro (one user) and Team (up to 1,000 users) both cost US$6 per user per month on monthly billing, with 17% off for annual billing; Enterprise is quoted and adds SAML SSO, SCIM and audit logs. Paid plans include a 14-day trial without a card, and an education plan is available. The free plan has unlimited users but a small sheet allowance.

Cacoo is one of the cheapest collaborative options. Its template and integration range is smaller than Lucidchart's, and downgrading from paid to free is not permitted.

OmniGraffle is a native diagramming and layout application for macOS, iPadOS and iOS from The Omni Group, which also makes OmniFocus, OmniOutliner and OmniPlan. The Mac version requires macOS 14 and the iPad/iPhone version iOS 16; stencils, projects and JavaScript automation are shared across devices.

It is one of the few products here still sold as a perpetual licence: in US dollars, Mac v7 Standard costs $149.99 and Pro $249.99, iPhone/iPad v3 Standard $59.99 and Pro $119.99. An annual subscription at $129.99 covers Mac, iPhone and iPad with the Pro version. A 14-day free trial is offered.

OmniGraffle is favoured by designers and Mac users who need precise layout control. It has no Windows or browser version, which rules it out for mixed-platform teams, and its collaboration is file-based rather than real-time.

Excalidraw is an open-source virtual whiteboard known for its hand-drawn visual style, suited to informal architecture sketches in documentation and presentations. Its code is published on GitHub, and a commercial service, Excalidraw+, adds cloud features.

The free tier includes the full editor, one infinite scene, unlimited collaborators, 10 generative AI requests a day and PNG/SVG export, with scenes encrypted end-to-end in the browser. Excalidraw+ costs US$6 per user per month with a 14-day trial and adds unlimited scenes and folders, cloud saving, sharing, PDF/PPTX export, comments, presentations, 100 AI requests a day and MCP and REST API access in beta; SOC 2 Type 2 compliance is listed.

Its informal look is deliberate and is the main reason to choose it; it is unsuited to formal notations, precise layouts or Visio compatibility.

Mermaid Chart is the commercial service from the team behind Mermaid, the open-source text syntax for generating flowcharts, sequence, class, Gantt and other diagrams from code. The company states that the core Mermaid syntax remains free and open source, while paid plans add AI features, diagram storage, real-time collaboration, integrations and security controls.

Plans: Basic is free with three diagrams; Plus costs US$10 per user per month billed annually with unlimited diagrams; Premium costs US$20 with 2,000 AI credits a year, shared workflow runs and unlimited free viewers; Enterprise is custom with SSO.

Diagrams-as-code suit engineering teams that keep documentation in Git, since diagrams can be reviewed like source code and rendered by GitHub, GitLab and many documentation tools. The approach is unfamiliar to non-technical users, and visual control is limited compared with drag-and-drop editors.