18th June 2026

Today we launched a new plugin for Datasette, datasette-apps , with this launch announcement post on the Datasette project blog. That post has the what , but I’m going to expand on that a little bit here to provide the why .

The TL;DR

Datasette Apps are self-contained HTML+JavaScript applications that run in a tightly constrained <iframe> sandbox hosted on your Datasette application. They can use JavaScript to run read-only SQL queries against data in Datasette, and can run write queries too if you configure them with some stored queries .

Here’s a very simple example and a more complex custom timeline example —the latter looks like this:

Apps are allowed to run JavaScript and render HTML and CSS.…