Flompt

flompt, created by independent developer Nyrok, is a free, open-source, MIT-licensed visual prompt builder that decomposes prompts into more than a dozen reusable semantic blocks, including role, objective, constraints, and examples, letting users edit them visually before recompiling them into Claude-optimized XML. It includes a browser extension for ChatGPT, Claude, and Gemini with sidebar integration, a Claude Code MCP server integration for agent-based prompt decomposition, and Make.com webhook support for routing prompts into automation workflows. flompt also offers built-in audit and scoring tools to assess prompt quality, version history with diff comparison, persistent context memory across projects, and more than 100 ready-made templates across 10-plus categories. It is completely free, requires no account, is self-hostable, and is available in English and French.