Side by side
LetDraw vs OpenCharts
Both stand on ai diagram generators. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan APISelf-hostedWeb
LetDraw combines diagram conversion, varied technical inputs, and a broad canvas toolset. Check its free-plan limits and paid-tier requirements for API, MCP, or self-hosting access before choosing it.
Visit LetDraw Free plan APIMacWeb+1
OpenCharts combines AI creation, project tools, and agent workflows, with a free tier and paid plans at stated monthly prices. Check the project limits and team minimum against how you plan to use it.
Visit OpenChartsThe facts
| LetDraw | OpenCharts | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Not published |
| Runs on | API, Self-hosted, Web | API, Mac, Web, Windows |
| Lowest paid plan | Pro: $5 a month | Starter: $9.99 a month |
| Plans published | 3 | 4 |
| Maker | Not published | Not published |
| Website | letdraw.com | opencharts.com |
| On ai diagram generators | #19 of 32 | #15 of 32 |
LetDraw: what it does well
- Converts Mermaid and D2 code into editable shapes.
- Generates diagrams from infrastructure and development inputs.
- Offers PNG, SVG, PDF, Mermaid, and D2 exports.
- Works offline and stores drawings locally by default.
- Live collaboration and shared snapshots use end-to-end encryption.
What to know first
- Free plan is limited to 3 documents and 1 workspace.
- Free users cannot create API or MCP tokens.
- Enterprise self-hosting is not included on other plans.
- Not formally SOC 2 or ISO 27001 certified.
OpenCharts: what it does well
- Free plan includes 500K AI credits and 10 GB storage.
- Theo AI creates multiple content types from descriptions.
- Presentation editor supports PPTX export and web publishing.
- Agents support triggers, connectors, and approval gates.
- OpenCharts says customer data is not used for AI training.
What to know first
- Teams requires at least three users.
- Starter limits flowcharts to 10.
- Compliance certifications are still in progress.
Alternatives to LetDraw Alternatives to OpenCharts The whole list