Prompt Toolkit

Visual prompt diffing and composition toolkit. Compare LLM prompts with role-aware diff and build prompts with a drag-and-drop flow builder. 100% client-side.

Features

• Role-aware diff (system / user / assistant / tool)
• Token-level and message-level comparison
• OpenAI, Anthropic, Gemini, and LangChain formats
• Drag-and-drop prompt flow builder
• Curated prompt templates
• JSON unescape and normalization
• 100% client-side

Frequently Asked Questions

What is role-aware prompt diff?

LLM prompts are structured as message lists with roles (system, user, assistant, tool). A role-aware diff aligns messages by role and index before comparing content, so you see meaningful changes rather than naive text diffs that misalign the conversation.

Which message formats are supported?

OpenAI Chat Completions, Anthropic Messages, Gemini Contents, and LangChain message arrays. The diff normalizes each format so you can compare a prompt across providers.

Is my prompt content uploaded?

No. Diffing and composition run entirely in your browser. Prompts are never sent to a server, which matters because prompts often contain sensitive business logic or data.