Mermaid Chart
6.6#17 in ai diagram generatorsFrom $12 a monthFree planWebAPIExtension
VisitMermaid Chart vs OpenCharts
OpenCharts
8.2#8 in ai presentation makersFrom $9.99 a monthFree planWebAPImacOSWindows
VisitWhat both publish
| Fact | Mermaid Chart | OpenCharts |
|---|---|---|
| Integrations | Official plugins and add-ons cover VS Code, JetBrains IDEs, Cursor, Windsurf, Claude Code, ChatGPT, Confluence, Jira, Google Docs, Microsoft Word, and PowerPoint. | Listed connectors include Stripe, HubSpot, Slack, Google Sheets, Discord, Airtable, Calendly, Apollo, Typeform, Monday, Gmail, Notion, GitHub, Linear, and others. |
| MCP server | Mermaid MCP can validate and render diagrams without authentication, while authenticated users can create, retrieve, update, and manage Mermaid Chart diagrams and projects. | Theo MCP provides 113 tools, five readable resources, a hosted Streamable HTTP endpoint, and 120 requests per minute per key. |
| Security | Mermaid states that it provides secure access controls, encryption, SOC 2 compliance, and SSO. | 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. |
Mermaid Chart plans
- BasicFree
- Plus$12 a month
- Premium$24 a month
- EnterprisePriced on request
OpenCharts plans
- Free ForeverFree
- Starter$9.99 a month
- Pro$24.99 a month
- Teams$14.99 a month
Pick Mermaid Chart if…
Mermaid Chart suits people who want to create diagrams from text or prompts, including developers, analysts, technical writers, project managers, and designers. Teams may value its live co-editing and comments.
Pick OpenCharts if…
OpenCharts suits people who want AI-assisted tools for visual planning, presentations, notes, code, and automated agents. Its stated focus on healthcare, insurance, and regulated industries may appeal to teams in those fields.