PromptVault is a free Chrome extension built for anyone who uses AI chat tools daily and is tired of re-typing prompts or digging through Notion docs and old chat histories. It works directly inside ChatGPT, Claude, Gemini, and other AI interfaces — letting you store, browse, and insert saved prompts without leaving the tab. Ships with 48 ready-to-use prompts out of the box, supports dynamic variables for prompts you reuse with different inputs, and includes an AI Improve feature to refine your prompts on the fly. No account, no subscription, no setup beyond installing the extension.