Cuey.

Cuey is a Chrome extension that checks the answer your AI gives against more than twenty other models, side by side, and points out where they disagree or what your model missed. It also carries your chat history and context across ChatGPT, Claude and Gemini, so a second opinion starts from what you already told your first model. The extension runs in the sidebar of the AI tools you already use; comparing, cross-checking and multi-language support are free with no account required.

AI models answer in the same confident tone whether they are right or wrong, and getting a trustworthy second opinion means copying prompts between tabs and repeating the same context.