LetDraw vs Diagrams.so

LetDraw9.1Visit Diagrams.so8.6Visit

Higher score LetDraw #4 in AI Diagram Generators 9.1/10 Free plan Free plan✓ 3 of 3 features Visit LetDraw

vs

Diagrams.so #8 in AI Diagram Generators 8.6/10 Free plan Free plan✓ 1 of 3 features Visit Diagrams.so

• LetDraw fits best

  Budget-conscious technical teams

• Diagrams.so fits best

  Draw.io architecture diagram users

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Side by side

Feature	LetDraw 9.1/10 Visit ↗	Diagrams.so 8.6/10 Visit ↗
At a glance
Editor score	9.1	8.6
Ranking	#4 in AI Diagram Generators	#8 in AI Diagram Generators
Best for	Budget-conscious technical teams	Draw.io architecture diagram users
Pricing model	Free plan + paid	Free plan + paid
Starting price	$50/yr	$10/mo
Free plan	✓	✓
Free trial	—	—
Deployment	Cloud, Self-hosted	Cloud, Browser extension
Platforms	Web	Web
Support	Email, Community, Docs	Email, Docs
Built for	Small business, Mid-market, Enterprise	Solo, Small business, Mid-market
Features LetDraw 3/3 · Diagrams.so 1/3
Mermaid support	✓ (best)	—
Real-time collaboration	✓ (best)	Not checked yet
Diagram import	✓	✓
Specs
AI diagram limit	Not checked yet	Not checked yet
Platform	Web	Web
Export formats	PNG, SVG, PDF, Mermaid, D2, WebM	.drawio, PNG, SVG, PDF, JPG
Our review
Pros	Generates editable diagrams from prompts, images, voice, and technical sources Supports Mermaid, D2, Docker Compose, Kubernetes, Terraform, SQL, and OpenAPI Combines collaboration, API/MCP access, offline use, and Enterprise self-hosting	Generates editable Draw.io diagrams from natural-language descriptions Includes architecture warnings, validation, and version history Offers REST API, MCP server, and Python and TypeScript SDKs
Cons	The Free plan includes only 3 AI prompts The paid plans do not state a numeric monthly AI diagram quota Advanced identity and provisioning features are limited to Enterprise	Free exports are watermarked Free plan requires a BYO LLM key Does not support Mermaid
Our verdict	LetDraw is a browser-based whiteboard and diagramming tool for engineers, DevOps teams, data teams, and other software-focused groups. Its AI can generate editable diagrams from text prompts, images, and voice, as well as from sources… Read the review →	Diagrams.so is a browser-based AI diagram generator for architects, DevOps engineers, technical founders, and engineering teams. It turns natural-language descriptions into editable Draw.io diagrams and supports AWS, Azure, GCP, and… Read the review →

Strengths and trade-offs

• LetDraw — where it wins

  • Generates editable diagrams from prompts, images, voice, and technical sources
  • Supports Mermaid, D2, Docker Compose, Kubernetes, Terraform, SQL, and OpenAPI
  • Combines collaboration, API/MCP access, offline use, and Enterprise self-hosting

  Where it doesn't

  • The Free plan includes only 3 AI prompts
  • The paid plans do not state a numeric monthly AI diagram quota
  • Advanced identity and provisioning features are limited to Enterprise

• Diagrams.so — where it wins

  • Generates editable Draw.io diagrams from natural-language descriptions
  • Includes architecture warnings, validation, and version history
  • Offers REST API, MCP server, and Python and TypeScript SDKs

  Where it doesn't

  • Free exports are watermarked
  • Free plan requires a BYO LLM key
  • Does not support Mermaid

• LetDraw9.1/10 · Free plan

  A low-cost technical diagramming workspace with AI, collaboration, and developer-friendly imports.

  Visit LetDrawFull verdict →
• Diagrams.so8.6/10 · Free plan

  A Draw.io-focused AI diagram generator with validation, imports, exports, and developer access.

  Visit Diagrams.soFull verdict →