FourLine
Chat with every AI at once, from one window.
FourLine launched on July 17, 2026 with 5 votes, #4,557 of 24,623 launches that month and more than 75% of that year's launches.
What it does
Bring all your AI chats into one place. FourLine is a powerful browser extension that lets you use multiple AI services side-by-side in a unified workspace, supercharging your research, writing, and coding workflows.
Stop switching tabs. Broadcast your prompts, compare every response side-by-side, and make faster decisions in one distraction-free control center. Stop switching tabs. Broadcast your prompts, compare every response side-by-side, and make faster decisions in one distraction-free control center. Fourline is built to handle however you decide to work. Single focus mode, broad comparison grids, or rapid-fire broadcast—you aren’t locked into one tool. Add any URL as a tab. Drag and drop to reorder. Fourline instantly fetches the title and favicon. Per-tab zoom controls save automatically, and live URL tracking ensures that you never lose your spot in a long session. Single-pane mode for focus,…from fourline.ai
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