Datawrapper
datawrapper.de
Turns a pasted table into a publication-quality chart in four steps
observablehq.com
Reactive JavaScript notebooks for exploring data and building charts.
Notebooks where cells re-run automatically when anything they depend on changes, which makes building an interactive chart feel like editing a spreadsheet rather than writing a render loop. D3, Observable Plot and Inputs are available by default, and it can connect to DuckDB, Postgres, BigQuery and Snowflake. The reactive model is genuinely different from Jupyter and takes a session or two to stop fighting; an account is needed to create anything.
Questions
A genuinely usable free tier with paid plans for volume or team features. The reactive execution model is not Jupyter and will surprise you; creating notebooks requires an account.
Yes. Observable sends your input to its own servers to process it. That is fine for public material; for anything containing personal data, use one of the on-device tools instead.
The reactive execution model is not Jupyter and will surprise you; creating notebooks requires an account.
Alternatives
Same category or same task, ordered by how closely they overlap.
datawrapper.de
Turns a pasted table into a publication-quality chart in four steps
flourish.studio
Animated and scrollable data stories from a spreadsheet of numbers
rawgraphs.io
Makes the chart types nothing else offers — alluvial, beeswarm, treemap
datablist.com
Spreadsheet built for cleaning and deduplicating messy list exports
mockaroo.com
Generates realistic fake test data in CSV, JSON or SQL
ourworldindata.org
Long-run global data on health, energy and poverty, free to reuse