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Datasette Apps: Host Custom HTML Applications Inside Datasette

Simon Willison has launched datasette-apps, a new Datasette plugin that embeds sandboxed HTML+JavaScript applications directly inside a Datasette instance, giving each app live read-only SQL access to the underlying SQLite data. Apps run inside tightly restricted iframes using a combination of the sandbox attribute and injected Content Security Policy headers, preventing untrusted code from accessing cookies, localStorage, or external hosts. The concept originated from Willison's effort to replicate a Claude Artifacts-style experience inside Datasette Agent, before being promoted to a standalone top-level plugin.