Hey PH, I built Crossagent in 3 days because I was tired of being my own copy-paste middleware between AI tabs. The core idea: type @claude inside ChatGPT, and Claude responds in a sidebar using your own account. No API key. No proxy. Completely native. Type @all, ChatGPT, Claude, Gemini, Perplexity, Grok, Mistral, and Copilot all answer at once, then Claude synthesises. Would love brutal feedback on what's broken, what's missing, and what would make you actually use this daily.

I built this in 3 days because I was tired of being my own copy-paste middleware between AI tabs. The core mechanic: type @claude inside ChatGPT, and Claude responds in a sidebar using your own existing account. No API key, no proxy, nothing touches our server. It injects into Claude's actual input DOM, waits for the real response, and pulls it back. Type @all and all 7 AIs (ChatGPT, Claude, Gemini, Perplexity, Grok, Mistral, and Copilot) answer simultaneously. Claude then synthesises all 7 into one final answer. There's also a memory layer (Engram) that stores facts about you across every session and every platform. Switch from ChatGPT to Claude mid-project, and it already knows your context. Would love to know: what would make you actually use this every day?

Crossagent.si

@mention any AI from inside any other AI

@mention any AI from inside any other AI