Best Diagramming Tools 2026
by Anonymous
Diagramming tools create visual representations of systems, processes, and architectures. From flowcharts and sequence diagrams to network topologies and ERD schemas, these tools help teams communicate complex ideas clearly. The best options balance ease of use with professional output quality, offering real-time collaboration, version history, and export formats suitable for documentation and presentations.
Excalidraw
Free, open source (Plus $7/mo)
price
Freeform whiteboard, any diagram
diagram types
Real-time, shareable links
collaboration
No, visual editor
code-based
JSON files, diffable
git integration
PNG, SVG, JSON
export formats
draw.io
Free, open source
price
Flowcharts, UML, network, ERD
diagram types
Via Google Drive/Confluence
collaboration
XML-based, visual editor
code-based
VS Code extension, GitHub
git integration
PNG, SVG, PDF, XML, VSDX
export formats
Mermaid
Free, open source
price
Flowcharts, sequence, Gantt, class
diagram types
Via Git (text-based)
collaboration
Yes, Markdown-like syntax
code-based
Native, renders in GitHub/GitLab
git integration
SVG, PNG (via CLI)
export formats
Lucidchart
Free 3 docs, from $7.95/mo
price
All types, 1,000+ templates
diagram types
Real-time, comments, cursors
collaboration
No, visual editor
code-based
No native git integration
git integration
PNG, SVG, PDF, VSDX, CSV
export formats
tldraw
Free, open source
price
Freeform whiteboard, shapes
diagram types
Real-time multiplayer
collaboration
No, visual editor
code-based
JSON files, diffable
git integration
PNG, SVG, JSON
export formats
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