What problem does it solve? Free users often never convert to paid because upgrade prompts appear at the wrong time, show weak value propositions, or use pushy patterns that erode trust. This Skill provides a structured framework for designing in-app paywalls and upgrade flows that convert without annoying users. ## Core Features & Use Cases - Paywall Type Playbooks: Ready-made layouts and copy patterns for feature locks, usage limits, and trial expiration screens, each with headline, value demonstration, comparison, CTA, and escape hatch components. - Trigger Timing & Frequency Rules: Guidance on when to show prompts (after aha moments, at genuine limits), when not to (during onboarding or active flows), and how to cap frequency with cool-down periods. - Experiment Backlog: A references file with dozens of A/B test ideas covering triggers, layout, pricing presentation, copy, trials, personalization, and dismiss behavior. - Use Case: A project management tool limits free users to 3 projects. When a user tries to create a 4th, the Skill helps design a usage-limit paywall that shows what Pro unlocks, addresses the user's frustration, and includes a clear escape hatch. ## Quick Start Ask the assistant to design an upgrade paywall for your product, describing your free plan limits, paid features, and the moment the prompt should appear.