flompt
Visual prompt builder: decompose, edit, and compile prompts into Claude-optimized XML.
A solid free tool for prompt engineers who want structure over guesswork. The visual blocks, quality scoring, and Claude Code MCP integration are genuinely useful. But it's clunky for quick one-liners and lacks collaboration features. Best for solo power users, not teams.
- Prompt engineers and AI hobbyists who want structured, reproducible prompts
- Developers using Claude Code who need programmatic prompt decomposition via MCP
- Content creators who write complex multi-section prompts (blog posts, scripts)
- Power users who want quality feedback and version control on prompts
- Users who prefer simple free-form text input or quick one-off prompts
- Teams who need collaborative prompt building or shared workspaces (none)
- Users who require optimization for non-Claude models (compiles to XML for Claude)
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In short
flompt — Visual prompt builder: decompose, edit, and compile prompts into Claude-optimized XML. Best for Prompt engineers and AI hobbyists who want structured, reproducible prompts, Developers using Claude Code who need programmatic prompt decomposition via MCP, Content creators who write complex multi-section prompts (blog posts, scripts). Free to use.
Viability Score
How likely is flompt to still be operational in 12 months? Based on 4 signals — momentum (how recently it shipped), wrapper dependency, revenue model, and web presence.
Last calculated: July 2026
How we score →Key Features
- Visual prompt builder with 16 typed blocks
- Compile prompts into Claude-optimized XML
- Browser extension for ChatGPT, Claude, Gemini
- Claude Code MCP integration (3 tools)
- Make.com webhook integration
- Prompt Audit tool (scan for gaps, one-click fix)
- Prompt Score tool (0-100 rating with tips)
- Version history with save, restore, diff view
- Context memory: persistent per-project facts
- 100+ ready-made prompt templates
- Resizable sidebar, stays hidden when not needed
- Open source, MIT licensed
- Self-hostable, Docker ready
- No account required to use
- English and French interface
About flompt
flompt is a free, open-source visual prompt builder that decomposes prompts into 16 typed blocks (role, objective, constraints, output format, etc.), lets you edit them on a canvas, and recompiles them into Claude-optimized XML. It's built for developers, power users, and AI enthusiasts who want systematic prompt engineering without guesswork. The tool ships a browser extension for ChatGPT, Claude, and Gemini, a native MCP server for Claude Code, and Make.com integration for automation. Built-in Audit and Score tools provide quality feedback, version history with side-by-side diff, and persistent context memory per project. Unlike plain text editors, flompt enforces structural thinking and compiles to structured XML, making it particularly effective for Claude models. It's MIT-licensed, requires no account, and works entirely in-browser or via self-hosted Docker.
Behind the Verdict
We'd reach for flompt when we want to move from 'vibes-based prompting' to something repeatable and testable. The 16-block system forces you to think about role, constraints, examples, and output format separately — which is exactly what makes Claude prompts work well. In practice, the Audit tool catches obvious holes (no role? no examples?) and the Score tool gives a 0-100 rating you can track version to version. Version history with diff is a nice touch for iterating. Where it bites: there's no team sharing, no workspaces, and no way to collaborate on prompts. If you're a solo developer or a power user who wants to build a library of bulletproof prompts for Claude, flompt is one of the best free options out there. The MCP integration means you can call decompose_prompt and compile_prompt from Claude Code, which is a genuine time-saver. But if you need to optimize for GPT or Gemini's XML formatting, flompt's Claude-specific XML might not be ideal. Compared to something like Poe or TypingMind, flompt is far more structured but has zero LLM chat built in — it's purely a prompt compiler. The browser extension is the easiest on-ramp: install it, and you get a flompt button inside ChatGPT/Claude/Gemini that lets you edit blocks and inject the result back. That workflow feels natural. If you're the kind of person who saves prompt templates as text files, flompt will feel like an upgrade. If you just type 'write a blog post' and go, it's overkill.
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Use Cases
- Structure a complex prompt into clear role, objective, constraints, and output sections
- Audit prompts for missing elements like examples or constraints before sending to an LLM
- Use the browser extension to improve prompts directly within ChatGPT, Claude, or Gemini
- Integrate prompt decomposition into Claude Code workflows via the MCP server
- Save and compare prompt versions to track improvements over time
- Send structured prompts to Make.com scenarios for automated processing
Models Under the Hood
Limitations
- flompt is free and open-source with no usage limits.
- However, it currently only compiles to Claude-optimized XML, not other model formats.
- The tool is in early development, so some features like collaboration or advanced plugins may be missing.
- The browser extension is only available for Chrome and Firefox.
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