Tool & Platform Beginner ★ Featured

draw.io (diagrams.net)

draw.io / JGraph

LevelBeginner

Who it's forDevelopers and PMs drawing flowcharts, architecture and UML diagrams

LanguageMultilingual (incl. Chinese)

PriceFree

PricingFree

Sign-upNo sign-up

Free tierCompletely free and open source (Apache 2.0)

Chinese supportChinese UI available

TypeTool & Platform

CategoryProductivity & Office

Link check2026-10-23

Overview

Open-source free online diagramming tool for flowcharts, UML, architecture and ER diagrams. Save locally or to Google Drive/GitHub — no sign-up.

Open source and self-hostable; files stay local or in your chosen cloud.

FlowchartArchitecture diagramOpen source

https://www.drawio.com/

Spotted an issue? Broken link · Wrong info