Diagrams.so vs OpenCharts
Diagrams.so
diagrams.soOpenCharts
opencharts.comSide by side
| Figure | Diagrams.so | OpenCharts |
|---|---|---|
| Price from | $10/mo | $9.99/mo |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | — | Yes |
| macOS | — | Yes |
| API | Yes | Yes |
| Plans published | 3 | 4 |
| Spec score · AI Diagram Generators | 8.2 (#11) | 8.4 (#8) |
| Compliance | Diagrams.so says it follows SOC 2-aligned security practices but is not currently certified against SOC 2, HIPAA or PCI-DSS. | OpenCharts says it uses GDPR-aligned data handling and is working toward SOC 2 Type II and ISO 27001 certification. |
| Integrations | The product offers a REST API, MCP server, and Python and TypeScript SDKs, and names Claude, Cursor and VS Code as MCP clients. | Listed connectors include Stripe, HubSpot, Slack, Google Sheets, Discord, Airtable, Calendly, Apollo, Typeform, Monday, Gmail, Notion, GitHub, Linear, and others. |
| Security | The maker says data is encrypted in transit with TLS 1.3 and at rest with AES-256, and that it does not train AI models on customer diagrams or prompts. | OpenCharts states that data is protected with TLS 1.2+ in transit, AES-256 at rest, SSO/SAML, RBAC, row-level security, and two-factor authentication. |
Plans
OpenCharts
- Free ForeverFree
- Starter$9.99 a month
- Pro$24.99 a month
- Teams$14.99 a month
In their own words
Diagrams.so
Diagrams.so turns written descriptions into editable architecture diagrams, saved in Draw.io format. It generates flowcharts, sequence diagrams, entity relationship diagrams and cloud infrastructure diagrams, with official AWS, Azure, Google Cloud Platform and Kubernetes icon libraries alongside network, database, security and general-purpose shapes. Opinionated Mode can suggest missing components; non-blocking warnings flag risks such as single-AZ deployments and publicly exposed resources. Diagrams export as.drawio XML, PNG or SVG, and.drawio files open in Draw.io, Confluence, VS Code and Notion. Users can import.drawio files on every plan and compare or restore versions using history. The product offers a REST API, MCP server, and Python and TypeScript SDKs, with Claude, Cursor and VS Code listed as MCP clients. Free includes five credits, requires a BYO LLM key and watermarks exports. Free-tier diagrams are public; private diagrams require Pro or Power. Pro costs $10 a year billed annually or $15/mo billed monthly; Power costs $16.67 a year billed annually or $25/mo billed monthly.
OpenCharts
OpenCharts is an AI workspace for flowcharts, presentations, notes, code, video, and agents. Theo AI can create these materials from plain-language descriptions. Flowcharts use terminal, process, decision, and data nodes on an infinite canvas, with automatic layout and export tools. The presentation editor supports editable slides, speaker notes, transitions, AI generation, rehearsal coaching, web publishing, and PPTX export. Theo Agents can start on schedules, webhooks, monitoring triggers, or manually; they can use external connectors, human approval gates, and produce deliverables. Connectors include Stripe, HubSpot, Slack, Google Sheets, Discord, Notion, GitHub, and others. A REST API manages project types, and the Theo MCP server provides 113 tools and five readable resources. Each account starts with 10 GB of Drive storage, including Free Forever. That plan costs nothing and includes 500K AI credits and one of each project type. Starter costs $9.99 a month, Pro $24.99 a month, and Teams $14.99 a month with a three-user minimum. OpenCharts says it does not use customer data to train or fine-tune AI models.