What is ai-bridge?

AI Bridge is a free desktop app that puts Claude, ChatGPT, Gemini, and Copilot side by side in one window, including multiple accounts of the same service at the same time, such as two separate Claude accounts. The idea is simple: when you run out of usage on one AI and need to keep going, you click Share, and your entire conversation, both your messages and the AI's replies, gets pasted straight into another AI's input box along with a short instruction telling it to pick up where the last one left off. You just press Enter and keep working. Everything runs locally on your own computer. There is no server involved, no stored passwords, and no automated logins. You sign into each AI service the normal way inside its own pane, and each pane keeps its own separate, persistent session, so nothing gets mixed up between accounts. The app can carry over very long conversations, up to about 120,000 characters, trimming the oldest part first if a conversation is bigger than that. Nothing is sent anywhere unless you personally press Enter in the destination chat. Getting started means installing Node.js if you do not already have it, then cloning the project, running npm install to fetch its dependencies including Electron, and running npm start to launch it. Logins are remembered between sessions, so you only sign in once per account. By default two panes open, one for Claude and one for ChatGPT, and you can add more panes for other platforms or extra accounts, each with its own label. Clicking a tab shows it on the left side, and holding Ctrl while clicking shows it on the right, so you can compare two conversations or hand one off to the other. For very long chats, scrolling up in the source pane first helps make sure older messages are loaded before sharing. The project notes that if a supported AI service changes its page layout, the part of the code that reads messages from that page may need updating. It is released under the MIT license.