5 Best Terraform Diagram Tools in 2026 (Honest Comparison)

Every few months we get the same question from teams evaluating Infragr.am: "How do you compare to Pluralith / Brainboard / Holori / Terravision?"

So we wrote it down. Honestly. Including where we lose.

A note on bias: we build Infragr.am, so this is not a neutral source. We've tried to be specific about where competitors are stronger, and we link to each tool so you can verify yourself.

How We Evaluated#

A diagram tool stops mattering the moment it stops being used. So the criteria below are weighted by what actually keeps teams using a tool six months in:

• Output quality — are the diagrams readable to a human who didn't write the code?
• Determinism — does the same Terraform produce the same diagram every time? See why determinism matters.
• Deployment model — SaaS, self-hosted, CLI?
• PR / CI integration — does it show up where reviewers already work?
• Coverage — which clouds and resources are supported?
• Pricing transparency — can you predict the bill?

1. Infragr.am#

What it is: A hosted service that generates layered architecture diagrams from Terraform. Output is deterministic — the same input always produces the same diagram. Available as an API, an MCP server (for AI agents), and a GitHub App.

Best for: Platform teams that want diagrams on every pull request without maintaining a CI step, and compliance contexts where reproducibility matters.

Strengths:

• Deterministic rendering — useful for diffs, drift detection, and audit evidence
• Layered output (Network, Security, Compute, Data) instead of one cluttered graph
• draw.io export, so teams can keep using their existing editing workflow
• GitHub PR integration posts the updated diagram as a comment automatically (see the how-to)
• MCP server for AI agents — useful if Copilot or Claude Code is writing your Terraform

Where it falls short:

• AWS and GCP coverage is solid; Azure coverage is newer and still catching up
• No real-time collaborative editing (it's a generation tool, not a whiteboard)
• Self-hosted deployment is available only on enterprise plans

Pricing: Free tier for small projects, paid tiers based on how many diagram builds you run each month, pooled across the whole organization rather than metered per repository. Repositories and seats are unlimited on every tier. Enterprise pricing for self-hosted deployments.

2. Pluralith#

What it is: A CLI that runs alongside Terraform, captures plan output, and generates diagrams. Integrates with a hosted dashboard that stores plan history.

Best for: Teams that want diagrams driven by real terraform plan output (not just static HCL) and a visual history of how plans evolved.

Strengths:

• Uses real plan output, which captures things static parsers miss (computed values, post-plan resource counts)
• Visual history of every plan stored in their dashboard
• Comments on pull requests automatically when wired into CI
• Strong AWS support

Where it falls short:

• Requires Terraform credentials in CI to run plan — bigger blast radius than tools that read HCL only
• The CLI is the primary surface; programmatic API access is more limited
• Visual layout is denser than some teams want — one big diagram rather than separate lenses

Pricing: Free for solo developers, team tiers with per-seat pricing.

3. Brainboard#

What it is: A visual cloud architecture designer that goes in both directions — you can design visually and generate Terraform, or import Terraform and get a diagram.

Best for: Teams that want a diagramming surface as their source of truth, and are willing to commit to a visual-first workflow.

Strengths:

• Two-way sync: edit the diagram, get updated Terraform; edit the Terraform, see the updated diagram
• Strong multi-cloud coverage (AWS, Azure, GCP, Scaleway)
• Collaboration features (comments, version history, role-based access)

Where it falls short:

• Heavier tool — you're adopting a platform, not adding a step
• Visual-first means engineers who prefer writing HCL by hand may push back
• Pricing scales fast for larger teams

Pricing: Multiple tiers with per-seat pricing. Free tier exists but is limited.

4. Holori#

What it is: A hosted tool that focuses on PR-time diffs. The diagram lives in a Holori dashboard; pull requests get comments showing what changed.

Best for: Teams whose primary use case is "what does this PR actually change in the architecture?" rather than ongoing documentation.

Strengths:

• PR diff workflow is the core product, not a side feature
• Good at highlighting what changed between two states
• Cost-estimation features built in (estimates the cloud cost impact of changes)

Where it falls short:

• The diagrams themselves are less polished than dedicated diagramming tools
• Coverage outside the major AWS services thins out
• Less flexibility in exporting to other editing tools

Pricing: Team-tier focused, transparent on their site.

5. Terravision#

What it is: An open-source CLI that converts Terraform into diagrams using official cloud icon sets. Self-hosted, free.

Best for: Engineers who want full control, no external service, and are happy maintaining a CI step themselves.

Strengths:

• Free and open source — no vendor lock-in
• Uses official AWS, GCP, and Azure icons
• Interactive HTML output with pan/zoom and search
• Optional AI annotations (which you'll want to turn off if determinism matters)

Where it falls short:

• You maintain the CI pipeline, dependency stack, and assets yourself
• Layout is functional but not architecturally layered
• Updates lag behind the cloud providers' newer resources
• No built-in PR integration — you have to wire it up

Pricing: Free.

Side-by-Side: Quick Reference#

Deterministic output:

• Infragr.am: yes
• Pluralith: yes (plan-driven, deterministic per-plan)
• Brainboard: yes
• Holori: yes
• Terravision: yes if AI annotations are off

PR integration out of the box:

• Infragr.am: yes (GitHub App)
• Pluralith: yes (CLI in CI)
• Brainboard: limited
• Holori: yes (core feature)
• Terravision: build it yourself

Layered diagrams (separate views per concern):

• Infragr.am: yes
• Pluralith: no (single dense view)
• Brainboard: configurable
• Holori: limited
• Terravision: no

draw.io export:

• Infragr.am: yes
• Pluralith: no
• Brainboard: yes
• Holori: limited
• Terravision: SVG only

Multi-cloud coverage:

• Infragr.am: AWS, GCP strong; Azure newer
• Pluralith: AWS strongest
• Brainboard: AWS, Azure, GCP, Scaleway
• Holori: AWS-focused
• Terravision: AWS, GCP, Azure

Self-hosted option:

• Infragr.am: enterprise plan
• Pluralith: CLI runs locally; backend hosted
• Brainboard: hosted only
• Holori: hosted only
• Terravision: fully self-hosted

Which Tool For Which Team#

A rough mapping based on the teams we talk to:

• Compliance-heavy environment, need audit-grade evidence: Infragr.am. Determinism is the core promise.
• Want plans (not just code) reflected in diagrams: Pluralith. The plan-output approach catches things static parsers miss.
• Diagramming is the source of truth, engineers happy to design visually: Brainboard. The two-way sync is the differentiator.
• Primary use case is "what changed in this PR": Holori. That's the product.
• Solo developer or strict no-SaaS policy: Terravision. Free, self-hosted, good enough for personal projects.

FAQ#

Are these tools interchangeable?#

Not really. They optimize for different things — Infragr.am for review and compliance, Pluralith for plan-driven visibility, Brainboard for visual design, Holori for PR diffs, Terravision for self-hosted simplicity. Pick based on the workflow you're trying to support.

Can I use more than one?#

Yes, and some teams do. A common pattern is Terravision for local development (free, no signup) and a hosted tool for the team's shared workflow.

Why did you leave out Eraser AI / generic diagram-from-prompt tools?#

We focused on tools whose primary input is Terraform code or state, not natural language. AI-only generators are useful for early sketching but produce probabilistic output, which makes them unsuitable for review or compliance. See our deep dive on AI vs deterministic diagrams.

How do I evaluate without committing?#

Most of these tools have a free tier or trial. Pick the three most relevant to your situation, throw a real piece of Terraform at each, and see whose output you'd actually show to a reviewer. The polished demo never matches what happens with your code.

Does AI-generated Terraform change which tool I should pick?#

It raises the bar on determinism. If Copilot or Claude Code is writing your modules, you need a way to verify what the AI produced — and that verification step should not itself be probabilistic. See Cognitive Debt: The Hidden Cost of Infrastructure as Code for the broader argument.

Closing#

The tool that wins for your team is the one that fits the workflow you already have. Generating a diagram is the easy part. Generating a diagram that stays current, gets seen by reviewers, and is trusted by auditors — that's where the tools actually differentiate. Start with the use case, not the feature list.