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+---
+epic: 15
+story: 15.1
+title: "Free Tier"
+status: draft
+---
+
+## Epic 15 — Monetization & Onboarding
+**Goal:** Establish sustainable revenue with a generous free tier and frictionless onboarding.
+
+### Story 15.1: Free Tier
+
+As a CalcPad user on the free tier,
+I want access to core calculation features without payment,
+So that I can evaluate CalcPad fully and use it for everyday calculations at no cost.
+
+**Acceptance Criteria:**
+
+**Given** a user is on the free tier
+**When** they use the application
+**Then** they can perform unlimited calculations with no daily or monthly cap
+**And** all built-in units and currency conversions are available
+**And** they can create and manage up to 10 sheets
+
+**Given** a free-tier user attempts to create an 11th sheet
+**When** the sheet creation action is triggered
+**Then** a non-intrusive prompt explains the 10-sheet limit
+**And** the prompt offers an upgrade path to Pro
+**And** existing sheets remain fully accessible and editable
+
+**Given** a free-tier user
+**When** they access appearance settings
+**Then** the basic set of built-in themes is available for selection
+**And** Pro-only themes are visible but marked with a Pro badge and are not selectable
+
+**Given** a free-tier user
+**When** they export a sheet
+**Then** export to plain text and Markdown formats is available
+**And** PDF and HTML export options are visible but marked as Pro features
+
+**Given** a free-tier user with no internet connection
+**When** they use CalcPad offline
+**Then** all free-tier features work fully offline including calculations, unit conversions, and local sheet storage