Apache Superset ships with more than fifty chart types, and for most dashboards, that is plenty. But what happens when you need something more specific—a bullet chart against a target band, a Sankey with a custom node order, a map layer the built-in deck.gl charts do not offer, or a KPI tile that colours itself against three thresholds instead of one?

At that point, you have two options: bend an existing chart until it almost fits, or build a plugin that fits your needs. Plugins are how Superset itself is built.

Every chart in the Explore view, from the humble table to the ECharts time series, is a plugin registered through the same ChartPlugin API you are about to use. A custom plugin is not second-class. It gets the same query layer, the same control panel framework, the same dashboard filters and cross-filters, and the same theming.

This guide builds a small but complete plugin for Superset 4.x. The chart is deliberately simple: a bar per category with a configurable highlight threshold, keeping the focus on the plugin mechanics. Once the plumbing is in place, swap the rendering for ECharts, D3, or deck.gl.

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