Flint: A Visualization Language for the AI Era

Microsoft Research's Flint is a visualization intermediate language designed to let AI agents create expressive and consistent visualizations from concise chart specifications alone.

Users only need to specify the data, semantic type, chart type, and encoding. The Flint compiler automatically generates low-level settings such as axes, scales, spacing, and layout based on the data and visual meaning, converting them into backend-specific chart specifications.

• Supports 50 chart types
• Provides 5 rendering backends: Vega-Lite, ECharts, Chart.js, Plotly, Excel
• npm packages available for JavaScript and TypeScript
• Provides an MCP server and Agent Skill for AI agent integration
• 121 examples available in the gallery

Chart specifications can be edited directly by humans, and a single unified interface can generate visualizations across multiple engines as well as Excel charts. Flint 0.4.0 added 38 Plotly chart types and 18 editable Excel chart templates, while the previous version introduced widget functionality for dynamically switching chart types and modifying properties.