Merlin vs ChatGPT: Do You Actually Need an AI Browser Extension?

The honest version of the question this article is answering: is the thing you find annoying about using ChatGPT the fact that it is a separate tab, or is it something else?

If it is the tab — if the friction of copying text, switching, pasting, reading the response, switching back, and implementing it has started to feel like overhead — Merlin is a solution to that specific problem. It puts AI assistance inside the tab you are already in.

If the friction is something else — the quality of responses, the context window, the lack of memory — a browser extension does not fix those things. It just moves them into a different part of your browser.

What Merlin actually is

GetMerlin is a browser extension that gives you access to multiple AI models — GPT-4o, Claude, Gemini, and others — through a sidebar or keyboard shortcut (Ctrl/Cmd + M) that opens wherever you are. Highlight text on any page, invoke Merlin, and it can summarise, rewrite, translate, or respond to whatever is selected without you leaving the page.

The practical use cases it is genuinely good for: summarising a long article while staying on that article’s page, drafting a reply to an email while looking at the email, and writing LinkedIn posts or responses without opening a new tool. The context is the page you are on, which means you do not have to re-explain it.

Where each one wins

Merlin wins on in-context work. Email composition, web research, document drafting — any work that happens on a specific page benefits from having AI that can see that page without copy-paste. The free tier allows meaningful daily use — the model selector shows free-tier queries available at sign-in, and the limit covers most professional workflows for occasional use.

Merlin wins on model variety. If you want to try different AI models without maintaining separate subscriptions to each, one Merlin subscription surfaces several. For experimentation this has genuine value.

ChatGPT wins on depth. Longer conversations, uploaded documents, file analysis, persistent memory across sessions, Projects for organising ongoing work — these are capabilities that live in ChatGPT’s own interface and do not travel into an extension. The longer and more complex the task, the more ChatGPT’s interface serves it better.

ChatGPT wins on context length. In-context processing of large documents is limited in extension form. For research-heavy work, the native interface handles more.

The workflow this actually describes

The professionals who get the most from Merlin are the ones who spend most of their working time in their browser doing things other than AI prompting: reading, email, research, client portals, web-based tools. For them, having AI one keystroke away in the same window is a meaningful reduction in friction.

The professionals who get less from it are those who already have established AI workflows in ChatGPT or Claude’s native interfaces. For them, the extension adds a shortcut to a process that is not their bottleneck.

Both can coexist. Merlin for quick in-context help while working. ChatGPT for longer, more involved sessions. The practical question is whether your daily AI friction is “too many tab switches” or something the tab switch is not responsible for.

If you are testing Merlin, the free tier is enough to find out which category you are in before paying for anything.