Type in ChatGPT, Claude, Gemini, Perplexity or DeepSeek and the same prompt is typed into the others you switched on, using the tabs you're already logged into. No API keys, no server in between. Every answer is timed. Free for two AIs at a time.
Hi PH. I built this because I pay for more than one AI and kept pasting the same question into three tabs to see which answer I trusted.
WhileAI is a Chrome extension. You type in whichever chat you're in; it types the same prompt into the others you turned on, in your own logged-in tabs, and clicks send. What you type never goes through a server of mine, and there are no API keys because it uses the subscriptions you already have.
It also times every answer per model. I added that as an afterthought and now check it more than anything else.
What it doesn't do: store the answers. That felt like a privacy line, so comparing is still by eye.
Known weakness: it depends on each site's markup. When a site redesigns, it breaks until I push a selector fix, which reaches installs within hours without a store review.
The free plan sends to two other AIs at a time with no prompt limit. Pro ($5/mo, 14-day trial) unlocks all five and the full history. Chrome on desktop.
I'm here all day. Tell me what breaks and what you'd want next.