Vellio is one workspace for every major AI model — GPT, Claude, Gemini, DeepSeek, Mistral, and more, side by side. Compare answers, search the web with real citations, and have the AI build downloadable spreadsheets and documents. Free to sign up and build your prompt library, synced to a Chrome/Firefox extension. Pro unlocks all live AI chat, search, and document creation — hosted credits included (2,000/month), no API key needed.