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+---
+epic: 12
+story: 12.3
+title: "Plugin Marketplace"
+status: draft
+---
+
+## Epic 12 — Plugin & Extension System
+**Goal:** Let power users extend CalcPad.
+
+### Story 12.3: Plugin Marketplace
+
+As a user,
+I want to browse and install community plugins from a marketplace,
+So that I can extend CalcPad with curated, ready-to-use capabilities.
+
+**Acceptance Criteria:**
+
+**Given** a user navigates to `calcpad.app/plugins`
+**When** the page loads
+**Then** a directory of available plugins is displayed
+**And** plugins are organized into categories (finance, science, engineering, crypto, dev)
+
+**Given** a user finds a plugin they want
+**When** they click the "Install" button
+**Then** the plugin is downloaded and placed in the correct plugin directory
+**And** it is available in CalcPad after the next reload or immediately if hot-reload is supported
+
+**Given** plugins are listed in the marketplace
+**When** a user views a plugin detail page
+**Then** they see: description, author, version, install count, user ratings, and a readme
+**And** they can submit their own star rating
+
+**Given** a user has installed a marketplace plugin
+**When** a new version is published by the author
+**Then** the user is notified of the available update
+**And** they can update with a single click