LLM Diff Viewer

Compare two LLM responses side by side with textual diff, semantic similarity scoring, and performance metrics.

Frontend only — No backend, no auth, no server. Runs entirely in the browser.

Stack

• React + TypeScript
• Tailwind CSS
• Vite
• Transformers.js (client-side embeddings)
• IndexedDB (local persistence)

Development

npm install
npm run dev

Build

npm run build

Note on API keys

API keys for LLM providers (OpenAI, Anthropic, Mistral) are stored in localStorage on the client side. They never transit through a server. This is a known limitation for a local-first tool.