AI browsers are starting to move from “interesting demo” to something you might actually use during the day. The question I wanted to answer was simple: if DIA and Perplexity Comet are both trying to bring AI into the browser, which one actually helps more in real life?
After using DIA for a week or two and spending about a day with Comet, the difference became pretty clear. They overlap in a few obvious ways, but they are not trying to solve the browser problem in exactly the same way.
Quick Answer
DIA feels like the cleaner, more intuitive research and writing assistant. It is good at working with the tabs you already have open, summarizing pages, using saved prompts called skills, and helping you write responses that you can review before posting.
Comet feels more powerful, but also more concerning. It can summarize and answer questions like DIA, but its bigger trick is that it can interact with webpages for you. It can click, type, wait for page changes, and in my testing even respond inside a live chat. That makes it useful, but it also raises real security and trust questions.
Both Are Still Early
DIA and Comet are both early-access AI browsers, and that shows. They are also both Chromium-based, which means they feel familiar if you use Chrome and can use Chrome extensions.
Pricing is also similar. Both have free options, a roughly $20-per-month tier, and a much more expensive top tier. At that price, one missing feature stood out immediately: neither browser currently syncs bookmarks, settings, skills, or shortcuts between computers.
That is a real workflow problem. If I create a DIA skill or a Comet shortcut on my desktop, I have to manually recreate or move it to my laptop. I ended up saving prompts in Bear just so I could copy them between machines. For a paid browser service, sync should not be missing.
What DIA Does Well
DIA is made by The Browser Company, the same team behind Arc. That background shows. DIA looks nice, feels thoughtful, and the AI sidebar is easy to understand.
The main idea is that DIA lets you chat with the current tab, selected tabs, open tabs, or sometimes tabs from the same domain. You can ask it to summarize an article, answer questions about a page, or compare information across multiple tabs.
The most useful part for me is DIA’s skills system. A skill is basically a saved prompt. For example, I created a simple skill to summarize with bullet points. I also have a YouTube summary prompt that looks at a video transcript, answers the main question first, gives a short summary, pulls out key points, and lists mentioned products when available.
That is where DIA starts to make sense. It is not just “summarize this page.” It becomes a reusable research assistant that can work the way you like to work.
DIA Across Multiple Tabs
One of the better DIA examples was opening several articles about the same topic and asking the sidebar to summarize information across those tabs.
Instead of reading each article separately and manually stitching together the answer, DIA can pull from the selected open tabs and give you a combined summary. That is useful when you are researching a topic, checking sources, or trying to understand what several sites are saying about the same event.
This is the kind of AI browser feature that feels practical to me. It saves time, but it still leaves the judgment with you.
DIA For Writing
DIA can also help with writing directly from the browser. In one example, I highlighted text in a Facebook group post and asked DIA to write a response saying Oakley has better battery life.
DIA noticed the highlighted text and generated a reply. Once I clicked inside the comment box, DIA offered an insert button and pasted the response into the field.
That is an important distinction: DIA prepared the response, but it did not post it for me. I still had to review it and decide whether to send it. For many people, that is probably the right balance.
Where DIA Falls Short
DIA’s biggest limitation is also part of why it feels safer: it does not really act on your behalf. It can help you research, summarize, draft, and insert text, but it is not taking over the webpage and clicking through tasks for you.
That makes DIA feel less risky, but it also means Comet can do things DIA cannot. If all you want is a smart sidebar for research and writing, DIA is very good. If you want an AI browser that can actually operate webpages, DIA is not that browser right now.
The other major downside is the lack of sync. No bookmark sync, no settings sync, and no skills sync makes it harder to use DIA across multiple computers.
What Comet Does Differently
Comet is Perplexity’s AI browser, and it feels much closer to Chrome with AI powers added on top. Visually, it is more familiar than DIA, but I personally prefer DIA’s layout and feel.
Comet has its own assistant sidebar, and it can do the basics you would expect: summarize a page, answer questions, and work from the current tab. It also has saved prompts, but Comet calls them shortcuts instead of skills.
Comet’s shortcuts have more advanced options. You can choose modes, models, and source types like web, academic, social, or finance. If you already like Perplexity, that may make Comet more appealing than replacing ChatGPT directly.
Comet Can Act On Pages
The big difference is that Comet can interact with the page. It can look at the webpage, figure out where the input fields and buttons are, type into them, and click.
In a Facebook example, I highlighted a person’s name and asked Comet to respond saying the glasses looked awesome. Comet lit up the page, found the comment field, pasted the response, and sent it.
That is impressive, but it is also the moment where I started thinking more seriously about safety. There is a big difference between an AI writing a draft for me and an AI posting something for me.
The Security Question
Comet’s ability to act on webpages is the feature that makes it powerful, and it is also the feature that makes me cautious.
If an AI browser can click buttons, type into fields, and operate logged-in websites, then we need to think carefully about what happens when it makes a mistake or gets pushed into doing something we did not intend.
The example that worries me is shopping or account access. If you are already logged into Amazon or another service and your browser can act on your behalf, I want a clear human confirmation step before anything important happens.
Right now, I am careful about leaving Comet running when I am not using it. I quit it when I am done because I do not want an AI-enabled browser sitting open in the background with access to logged-in sessions.
Live Chat Test
One of the most interesting tests was using Comet with a live chat page. I asked it to watch for a specific person’s next comment and reply with “hello.”
Comet monitored the chat, detected the next message, focused the input box, typed the response, and sent it. This was not a static webpage. It was reacting to something happening live.
That shows the potential of Comet-style AI browsing. It also shows why the security side matters. If the browser can wait, observe, and act, then the guardrails need to be very clear.
Could Comet Replace ChatGPT
One viewer asked whether a $20-per-month AI browser could replace ChatGPT. My answer is: it depends on what you use ChatGPT for.
I still use ChatGPT, and I still like it. Comet may cover a lot of browsing-related tasks, especially if you already prefer Perplexity for search and answers. But I would not automatically treat Comet as a one-to-one ChatGPT replacement.
For me, ChatGPT still feels like the more general-purpose tool. Comet is more about AI inside the browser, especially when the task involves the current webpage.
Voice And Developer Use
Comet also has a voice mode, which feels closer to talking to ChatGPT. DIA has microphone input, but in my testing that felt more like dictating text into the assistant instead of having a voice conversation.
For web development, both browsers can inspect a page in their own way and explain how to change something like a background color. Comet recognized that my LifeWithTech site was built on Squarespace and suggested where to make the change. DIA gave more general guidance around CSS, browser extensions, and developer tools.
Neither browser directly changed the live site background in my test. They were helpful for guidance, but not a replacement for knowing what you are changing.
Which One I Would Pick
If I had to describe the difference simply, DIA is the calmer research assistant and Comet is the more capable action assistant.
DIA is better if you want a nice browser that helps you summarize tabs, ask questions, create reusable prompts, and draft responses while keeping you in control.
Comet is better if you want the AI to actually operate webpages, fill fields, click buttons, and monitor what is happening on the page. That extra power is useful, but I would treat it carefully.
Right now, I am still torn. I like DIA’s design and workflow more. Comet can do more. The missing sync in both browsers is frustrating enough that it affects whether I would pay for either one yet.
Key Takeaways
- DIA and Comet are both Chromium-based AI browsers, so Chrome extensions and familiar browser behavior are part of the experience.
- DIA is stronger as a research, summarizing, and writing assistant, especially with reusable skills.
- Comet is more powerful because it can interact with webpages, including typing, clicking, and responding inside live pages.
- Comet’s action features are useful, but they raise real security and privacy concerns when you are logged into websites.
- Neither browser currently syncing bookmarks, settings, skills, or shortcuts is a major drawback, especially at paid subscription prices.
- Comet is not automatically a ChatGPT replacement; it depends whether your work is mostly browser-based or more general AI work.
Watch the Video
The video above for the full live walkthrough, including the DIA tab summaries, custom skills, Comet webpage actions, the live chat test, and the side-by-side reactions as each browser handled real tasks.
