The Best draw.io Alternatives in 2026

UMLet provides free, open source UML drawing with a simple interface for making diagrams, including sequence and activity diagrams.

Histogram Maker creates customizable histograms from entered values or imported CSV and Excel data, with image download options.

SankeyMATIC builds flow diagrams for comparing quantities across stages, with examples covering budgets, results, and processes.

Kroki provides one API for generating diagrams from textual descriptions using libraries such as Mermaid, PlantUML, Graphviz, and D2.

PlantText provides an online editor for PlantUML code and generates class, sequence, activity, and state diagrams.

RAWGraphs App provides a web interface for creating custom vector-based visualizations with the RAWGraphs core.

PlantUML generates UML and other diagrams from textual descriptions and exports results in formats including PNG, SVG, and PDF.

Pie Chart Maker creates customizable pie charts and lets users download them as JPG, PNG, or SVG files.

Bar, line, area, and scatter charts can be created with dimple, an open-source charting API for D3.js.

amCharts provides JavaScript charting components, maps, stock charts, and Gantt charts.

Interactive charts for multidimensional datasets can be built with dc.js, a JavaScript library that supports Crossfilter.

JSON Crack visualizes and edits JSON, CSV, YAML, and XML as interactive graphs, with formatting, querying, and validation tools.

text2diagram creates diagrams and charts from text descriptions, with real-time collaboration and document permissions listed on its page.

Kroki CLI converts diagram files through the Kroki service, inferring diagram type from the file extension by default.

Svgbob converts text-based ASCII diagrams into SVG graphics, with both a library and command-line interface.

Free open-source software for network visualization and analysis, with a desktop app and browser-based Gephi Lite for exploring graphs.

Line Graph Maker builds customizable line charts from labels and data values, with image export available from the page.

Graph Online creates graphs and applies algorithms for shortest paths, adjacency matrices, and minimum spanning trees.

The Chart.xkcd library creates charts in an xkcd style, with examples for line, XY, bar, pie, and radar charts.

BarGraphMaker creates customizable bar charts that users can download as JPG, PNG, or SVG images.

Gadfly provides statistical graphics and plotting tools for the Julia programming language.

torchvista visualizes a PyTorch model’s forward pass in notebooks and can export the visualization as an image, SVG, or HTML.

JSON Crack is an open source visualization application that turns JSON, YAML, XML, and CSV data into interactive graphs.

DiagramGPT generates diagrams from text prompts, with the project page describing diagram workflows for teams.