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+---
+epic: 15
+story: 15.2
+title: "Pro Tier"
+status: draft
+---
+
+## Epic 15 — Monetization & Onboarding
+**Goal:** Establish sustainable revenue with a generous free tier and frictionless onboarding.
+
+### Story 15.2: Pro Tier
+
+As a CalcPad Pro subscriber,
+I want access to advanced features including unlimited sheets, cloud sync, and collaboration,
+So that I can use CalcPad as my primary professional calculation tool.
+
+**Acceptance Criteria:**
+
+**Given** a user has an active Pro subscription or one-time Pro purchase
+**When** they use the application
+**Then** they can create unlimited sheets with no cap
+**And** cloud sync is enabled across all their devices
+**And** all themes including premium themes are available
+**And** custom theme creation is unlocked
+
+**Given** a Pro user
+**When** they access currency and financial features
+**Then** historical currency rates are available for past-date conversions
+**And** stock/ticker lookups are available for real-time financial data
+
+**Given** a Pro user
+**When** they use collaboration features
+**Then** they can share sheets with other users for real-time collaborative editing
+**And** they can set view-only or edit permissions on shared sheets
+
+**Given** a Pro user
+**When** they export a sheet
+**Then** all export formats are available: plain text, Markdown, PDF, and HTML
+**And** exported PDFs include formatted results with proper typography
+
+**Given** a Pro user
+**When** they access developer features
+**Then** CLI access to calcpad-engine is available for scripting and automation
+**And** API access is available for programmatic sheet evaluation
+**And** the plugin system is available for extending CalcPad with custom functions
+
+**Given** a Pro subscription expires or is cancelled
+**When** the user continues using CalcPad
+**Then** sheets beyond the 10-sheet limit become read-only (not deleted)
+**And** cloud-synced data remains accessible locally
+**And** Pro-only features are gracefully disabled with clear upgrade prompts