CompanionGPT

CompanionGPT is a small Chrome extension built around one simple habit: highlight something on a web page, then let an AI act on it. Instead of copying text into a separate chatbot window, the extension intercepts your selection and offers reply, rewrite, and summarize actions as a compact popup, so the workflow stays inside the page where the original conversation or article lives.

The reply mode is aimed at communication — it tries to produce a response that matches the tone and context of the thread you are reading, which makes it handy for inbox and chat work. Rewrite mode paraphrases or rephrases a block of text, and summarize mode compresses longer passages into shorter takeaways. There is also a persuasive tone option for shaping more convincing marketing or sales copy.

The extension is deliberately minimal: it is only a few dozen kilobytes, ships in English, and hands model access off to your own key. Two credentials are required before it will work — an active Companion-GPT license key, an email address, and a ChatGPT OpenAI API key. That means the extension itself is a thin client and your actual AI spend is billed by OpenAI. The listing has no user ratings and its last update was in July 2023, so treat it as a small, stable utility rather than a heavily maintained product.