AutoUML review
A free web tool for generating, editing, importing, and exporting five UML diagram types.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
AutoUML is a web-based AI diagram generator for students, solo developers, and engineering teams. It turns natural-language descriptions into class, entity relationship, sequence, use case, and activity diagrams. The Free plan includes AI UML diagram generation, PlantUML import, interactive editing, PNG and PDF export, and access without an account or credit card. Users can generate diagrams through AutoUML’s free allowance or connect their own API key from Gemini, OpenAI, or Grok.
The main strength is its focused workflow from description to editable diagram. A user can begin with plain English, refine the result on the interactive canvas, or import and render an existing PlantUML script. That combination suits people who want AI assistance without giving up a script-based workflow. Support for five specific UML types keeps the product aligned with software design and documentation rather than general-purpose visual diagramming.
Pricing is straightforward because the available plan is Free, with no account required to start. Bring-your-own API key support adds compatibility with Google Gemini, OpenAI, and xAI Grok, while the service remains web-only and provides PNG and PDF exports. AutoUML is a strong fit for lightweight UML creation, classroom work, technical planning, and individual documentation. Teams seeking broader diagram coverage, additional export formats, or a wider platform footprint should choose a tool designed around those needs instead.
AutoUML pros and cons
- Where it wins
- Generates five UML diagram types from natural-language descriptions
- Imports PlantUML scripts and supports interactive canvas editing
- Exports to PNG or PDF without requiring an account
- Where it doesn't
- Access is limited to the web platform
- Exports are limited to PNG and PDF formats
- Its focus is UML rather than a broader diagram catalog
AutoUML fact sheet, pricing and score →
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