DiagramPreview
Online workspace for previewing and generating developer diagrams with AI assistance.
FreeCoding & Dev
Visit website Free to browse · updated 2026-06-19
What is DiagramPreview?
The platform supports a wide range of preview capabilities for code-related diagrams such as Docker Compose structures, Kubernetes manifests, and CI/CD pipelines. Additional utilities handle conversions between diagram types and offer visualizers for schemas, configurations, and API specifications. AI-driven generators allow creation of Mermaid diagrams, PlantUML outputs, and editable draw.io files directly from descriptive text. Specialized tools also produce Grafana dashboards, Prometheus rules, and observability packs to support infrastructure monitoring needs. Further options include sequence diagram generators from OpenAPI specs or HAR files, along with debuggers for elements like robots.txt files and sitemaps. These features enable developers to inspect, refine, and export diagrams within a single browser-based environment.
Key features
AI Diagram Generator for Mermaid from natural language
Text to Mermaid converter for notes and architecture
Mermaid AI Fixer for syntax and readability
AI PlantUML Generator using DeepSeek
AI Draw.io Generator for editable diagrams.net XML
Grafana Dashboard Generator for Prometheus monitoring
OpenAPI to Sequence Diagram converter
AI models DiagramPreview uses
DeepSeek
Used for AI PlantUML Generator
What you can use DiagramPreview for
Natural Language to Mermaid Diagrams
Users input prompts in plain language to generate Mermaid diagrams for architecture, flows, or notes without manual coding.
Syntax Repair and Readability Improvement
Broken Mermaid code is analyzed and corrected for valid syntax while enhancing clarity and structure.
Observability Setup from Monitoring Data
Prometheus metrics and related sources are turned into Grafana dashboards, alert rules, and supporting architecture diagrams.
How to use DiagramPreview
- 1Open the DiagramPreview site in a browser
- 2Choose a generator such as AI Diagram Generator or Grafana Dashboard Generator
- 3Paste natural language text, notes, or source like OpenAPI
- 4Click generate to preview and refine the output
- 5Export the diagram or dashboard JSON as needed
DiagramPreview pricing
Pricing model: Free. Plan details are indicative — check the site for current prices.
Free
Free
- No signup needed
- All AI diagram tools and previews accessible
Editor's verdict
Pros
- +No signup required
- +Browser-based workspace for multiple diagram formats
- +AI tools for generation, fixing, and conversion
Cons
- –Web-only access
- –Dependent on browser environment
Our take: DiagramPreview is a solid coding & dev choice. It's valued for no signup required and browser-based workspace for multiple diagram formats. The main trade-off is web-only access. A good pick if you want capable AI without a high upfront cost.
Frequently asked questions
It supports Mermaid, PlantUML, draw.io XML, Graphviz, D2, Markdown, and mind maps for preview and generation.
Summary
DiagramPreview is a solid coding & dev choice. It's valued for no signup required and browser-based workspace for multiple diagram formats. The main trade-off is web-only access. A good pick if you want capable AI without a high upfront cost.
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