Free online chart and diagram tools

8 tools

Diagram editors, flowchart and sequence-diagram generators, chart builders, mind maps and whiteboards. Check the export formats (SVG, PNG, source text) before you invest time, since they decide whether a diagram can leave the tool.

Showing 1–8 of 8

0.478score
Graphviz DOT Renderer
Simon Willison
Renders DOT graph source as SVG as you type and stores the graph in the URL fragment for sharing.
ArtifactNo sign-upIn-browservisualization
0.478score
Pandas Bar Chart in Pyodide
Simon Willison
Runs pandas, numpy and matplotlib in the browser via Pyodide to draw a bar chart.
ArtifactNo sign-upIn-browservisualization
0.477score
Animated Word Cloud
Simon Willison
Draws a word cloud on a canvas where words spiral outward from the center until they find free space.
ArtifactNo sign-upvisualization
0.477score
CSV Marker Map
Simon Willison
Plots rows of a CSV with latitude and longitude columns as markers, configured through URL parameters.
ArtifactNo sign-upvisualization
0.477score
Gemini Bounding Box Viewer
Simon Willison
Asks Gemini to locate objects in an image and draws the returned bounding boxes on top.
ArtifactAINo sign-upvisualization
0.477score
Gemini Image Mask Viewer
Simon Willison
Requests segmentation masks from Gemini for objects in an image and overlays them for inspection.
ArtifactAINo sign-upvisualization
0.477score
Hacker News Term Histogram
Simon Willison
Charts how often several search terms appear in Hacker News stories per month over a date range you pick.
ArtifactNo sign-upvisualization
0.477score
Model Rating Race Chart
Simon Willison
Animated bar chart of Elo ratings over time that you can feed with your own JSON.
ArtifactNo sign-upvisualization