| Price from | — | €0.17/mo |
| Free plan | — | — |
| Free trial | — | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | Yes | — |
| macOS | Yes | — |
| Linux | Yes | — |
| iOS | — | Yes |
| Android | — | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | — |
| Plans published | 0 | 13 |
| Spec score · Diagramming Software | 7.9 (#31) | 8.8 (#7) |
| Spec score · Diagramming tools | 7.6 (#36) | 8.9 (#8) |
| Diagram types | software architecture diagrams; UML class diagrams; sequence diagrams | process maps,BPMN 2.0 diagrams,landscape maps,process houses,value chains,SIPOC diagrams,value stream maps,customer journey maps,swimlane diagrams |
| Free plan | Yes | No |
| Import/export formats | D2 (.d2); SVG; PNG; PDF; PPTX; GIF; ASCII | CSV export |
| Integrations | Official integrations include extensions for VSCode, Vim, and Obsidian; the extensions page also lists community plugins and tools. | Native connections include Microsoft Teams, SharePoint, OneDrive, Power BI, Power Automate, Power Apps, Google Drive and Azure AD. |
| Privacy | The repository FAQ says D2 does not use an internet connection after installation except to check periodically for version updates from GitHub. | Gluu states that data is not transferred to third-party countries and that it performs regular penetration testing. |
| Purpose | D2 is a declarative diagramming language that turns text into diagrams. | Gluu helps organizations understand, orchestrate, and improve end-to-end processes with work instructions, role-based access, and AI-powered mapping. |
| Support | The project directs users to Discord for help and GitHub Issues and Discussions for bugs, proposals, and feature requests. | Gluu advertises help-center articles, videos, in-app chat and rapid support response and closure times. |