Yantra

Yantra: Diagram tool that turns JSON descriptions into interactive architecture diagrams and flowcharts saved as offline HTML files.

Yantra is an open-source diagram tool that turns short JSON descriptions into interactive architecture diagrams, flowcharts, sequence diagrams, state machines, ER diagrams, org charts, mind maps, and one-page answers with charts. It automatically handles layout, edge routing, and label placement without manual coordinate setting. A built-in validator checks for broken references, overlaps, and label collisions, reporting stable codes that coding agents can fix. The output ships as a single offline HTML file requiring no network requests, with support for SVG, PNG, and Markdown exports. It runs from the command line, through coding agents via MCP, in browser playgrounds, or via Python.

Yantra at a glance

Best for: Software engineer, Product manager
Runs on: Web, CLI, API, Python, Node.js, self-hosted, open source
Pricing: Free and open source
Released: October 2026
Category: AI coding tool
Website: github.com/niyankhadka/yantra

Key features

Automatic layered layout and orthogonal edge routing
Built-in validator checking references and overlaps
Single offline HTML file export with no network requests
Import from Mermaid, PlantUML, draw.io, and Visio
Interactive walkthroughs with steps and autoplay
Support for architecture, flow, sequence, and state diagrams
Command line interface and Python SDK
Model Context Protocol (MCP) server integration

Use it for

Draw architecture diagrams from JSON descriptions
Convert existing Mermaid or PlantUML files
Build diagrams using coding agents with MCP
Generate step-by-step walkthroughs for processes

Alternatives to Yantra

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Flowstep — Generates interactive multi-screen UI directly from text prompts, specs, or code.
Jantt — Generates structured schedules for AI agents with fewer tokens.
Enola — Generates a deterministic graph of system architecture locally without AI.

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