InfraSketch

InfraSketch is a browser-based tool for turning infrastructure-as-code into architecture diagrams. It suits DevOps engineers and teams who need to map cloud infrastructure without drawing it by hand. Its broad format support, dependency analysis and export options make it a useful free choice, provided Terraform expressions that need evaluation are handled through plan JSON.

Overview

InfraSketch converts infrastructure definitions into diagrams that can be exported or shared. It works across several infrastructure formats and covers more than 85 resource types across AWS, Azure and GCP. Its client-side processing and offline use are notable for teams cautious about sending infrastructure code to a service.

Key features

Inputs include Terraform HCL and plan JSON, CloudFormation, CDK, Pulumi, Kubernetes, Terragrunt and Docker Compose; Bicep and ARM are also supported. That range makes InfraSketch relevant beyond Terraform-only teams. Raw HCL does not evaluate count, for_each or variables, however, so Terraform users relying on those expressions should use plan JSON for the affected cases.

Diagrams export as PNG, SVG, draw.io XML or Mermaid code and can be shared by URL. Diagram import is supported. Terraform users can upload a project ZIP to expand local modules or retrieve public modules from the Terraform Registry, helping expose components that would otherwise remain behind module references.

Blast-radius analysis shows direct and indirect downstream impact as well as upstream dependencies for selected resources. The maker also describes Checkov security and Infracost cost overlays, a GitHub Action, CLI, MCP server and embeddable web component. These options offer ways to bring diagramming and related views into broader workflows, though the tool's main value remains mapping infrastructure code.

The maker says parsing and rendering happen in the browser, without server processing, storage, telemetry, cloud credentials or uploaded code. The About page says InfraSketch works offline once loaded. The project is licensed under AGPL-3.0.

Pricing

InfraSketch has one Free plan at no cost. It requires no signup and has no usage limits; the plan is open source. There is no free trial because the product is free. With no paid tier described, it is a straightforward fit for individuals and teams who want the supported diagramming workflow without a subscription. Teams seeking a different pricing or support arrangement may prefer another tool.

Platforms

InfraSketch is available on the web and lists Linux, macOS and Windows platforms. Its browser-based processing and offline operation once loaded can suit users who need access without a continuously connected workflow.

Who it's for

InfraSketch is best suited to DevOps and SRE practitioners, infrastructure teams, and anyone who needs to inspect cloud-resource relationships from code. It is a particularly good fit for teams working across multiple infrastructure formats or needing dependency and impact views. Terraform users whose raw HCL depends on dynamic expressions should plan to use plan JSON; those looking primarily for a general-purpose diagram editor may find a broader diagramming tool more appropriate.

Pros and cons

• Pros: Broad infrastructure format support and coverage across AWS, Azure and GCP make it useful for varied cloud stacks.
• Pros: Multiple export formats, URL sharing and diagram import support several ways to reuse diagrams.
• Pros: Module expansion and upstream/downstream impact analysis help reveal infrastructure structure and dependencies.
• Pros: The free plan has no signup or usage limits, and the maker describes client-side processing and offline use once loaded.
• Cons: Raw Terraform HCL does not evaluate count, for_each or variables; affected workflows need plan JSON.

Alternatives

For a broader diagramming category, browse AI Diagram Generators.

• Creately is a freemium option with a Forever free plan that includes unlimited canvases and collaborators, with 45 items per canvas and one fold. Choose it when general collaborative canvases matter more than infrastructure-code analysis.
• Nimbalyst has a free Individual plan with no feature limits, and its desktop and iOS apps are MIT licensed. Consider it when those platforms or its open-source apps are a better fit.
• OpenCharts offers a Free Forever plan with 500K AI credits, one of each project type, one Code Canvas project, 10 GB Drive storage and all export formats. Choose it when AI credits and general project canvases better match your needs.
• Lucid Train has a free CLI with a full agent, local models or your own API keys, open-source code and no account requirement. It may suit readers seeking that local-model or agent workflow.
• AI Diagram Maker has a free Basic plan with 50 AI credits per month, AI generation and editing, and code, SVG or PNG export. Choose it when prompt-driven diagram creation is the priority.
• AI Flowchart offers a free plan with daily credits and ads. Consider it when a flowchart-focused option better fits the task.
• Archflow has a free plan with one project, three diagrams per project, user stories with a Kanban board and a basic UML-node editor. Choose it when those project-planning features matter more than code-derived infrastructure diagrams.
• ArchGPT has a free plan with recurring credits, saved diagrams and PNG downloads, alongside limits such as watermarked exports and a prompt-length cap. It may suit readers who want that free diagram-generation workflow.

Verdict

Choose InfraSketch if you want exportable architecture diagrams generated from infrastructure code, with resource-dependency analysis and no-cost, unlimited use. Its strongest case is the combination of broad infrastructure inputs, module handling and impact views. Look elsewhere if you need raw Terraform HCL expressions such as count, for_each or variables resolved directly rather than using plan JSON, or if your priority is general-purpose diagramming.