Diagrams.net

Security-first diagramming

TL;DR - Diagrams.net

Diagrams.net is a security-first diagramming tool offering online and desktop versions with no login required.
It features real-time collaboration, AI-powered diagram generation, and extensive integrations with major cloud storage and team collaboration platforms.
The platform emphasizes user privacy by allowing users to store their data wherever they choose, ensuring the service cannot access it.

Pricing: Free forever

Best for: Individuals & startups

Pros

No login or registration is required to use the online tool.
Users can choose where to store their data, enhancing privacy and control.
Supports real-time collaboration with shared cursors for team diagramming.
Offers extensive integrations with popular platforms like Google Drive, OneDrive, SharePoint, Atlassian (Confluence, Jira), GitHub, GitLab, and Dropbox.
Provides a desktop application for offline use and a VSCode integration, along with a Notion Chrome extension for embedding and editing diagrams.

Cons

Diagram generation relies on OpenAI, which may have implications for data privacy or usage terms depending on OpenAI's policies.
The Notion integration is a third-party Chrome extension, not a native integration, which might affect its reliability or feature set compared to first-party integrations.
While it states 'no login or registration required,' some integrations might implicitly require access to third-party accounts (e.g., Google, Microsoft) to function fully.