Comparison

Comet Browser

Zen Browser

Comparison Summary

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Comet Browser gives you a free agent mode that can interact with your tabs, emails, calendar, and even browse the web for you, while Zen Browser just copies Arc's sidebar and runs into bugs and extension issues because it's built on Firefox.

Only use Zen Browser if avoiding Google and Chromium matters more than having agent features or reliable site support, otherwise, stick with Comet Browser.

Comet Browser
Recommended
Best free agentic mode option
Best free agentic mode option
Zen Browser
Firefox-based Arc Browser Spinoff
Firefox-based Arc Browser Spinoff

At a Glance

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See how Comet Browser and Zen Browser compare on the most important Browser criteria.

Embedded AI
Best
User Experience
Draw
Tab Management
Draw
Performance Efficiency
Draw
Data Protection
Best

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ChatGPT Atlas
Best
Best AI Browser for ChatGPT users
Best AI Browser for ChatGPT users

Editor's Verdict

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Comet Browser stands out because it brings real agentic browsing to the table, letting you talk to the assistant, have it interact with your tabs, emails, and calendar, and even take over web navigation like a human assistant. This isn't just surface-level AI search; it's the only browser here that actually does things for you, and you get all this for free.

Zen Browser is basically a Firefox-based Arc clone for people who want to avoid Google and Chromium, but you lose a ton of extension support and end up with more buggy website experiences. Unless you're a diehard Firefox fan who cares more about escaping Chromium than getting practical new features, there's no real advantage here.

If you care about having a browser that actually works for you and can handle deep research, shopping, or just making your life easier with AI, Comet is the obvious choice. Zen only makes sense if you're specifically loyal to Firefox and willing to accept missing extensions and a rougher experience. For everyone else, Comet is miles ahead.

Screenshots

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Comet Browser

Examples of what Perplexity Assistant can do

Summaries

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Comet Browser At a Glance

See how Comet Browser compares on the most important Browser criteria.

Embedded AI: 6/7
User Experience: 3/7
Tab Management: 3/7
Performance Efficiency: 4/7
Data Protection: 3/7

Comet Browser Editor's Verdict

User Experience

You get a glimpse of what an AI-native, purpose-driven browser can feel like with Comet, especially if you're the kind of power user who wants an assistant that clicks around the web for you and pulls in email or calendar context. The interface is built to showcase these agentic features in a way that feels more user-friendly than most early AI browsers.

But the experience is rough around the edges. You run into moments where the assistant can't actually take action on the page you're on, even though the demos suggest it should. The workflow sometimes breaks down when you expect the assistant to handle something and it just can't, so you're still jumping in to finish the job yourself.

If you're an early adopter who likes trying new things and doesn't mind dealing with unfinished features, you'll appreciate what's here. For anyone expecting a polished, efficient user experience that just works, you're going to feel the inconsistency and friction.

Zen Browser At a Glance

See how Zen Browser compares on the most important Browser criteria.

Embedded AI: 1/7
User Experience: 4/7
Tab Management: 4/7
Performance Efficiency: 3/7
Data Protection: 5/7

Zen Browser Editor's Verdict

What is Zen Browser?

Zen Browser is heavily inspired by Arc Browser, with one core difference. It was built for those who want a Chromium alternative, but love the idea of a modern browser with a powerful sidebar, like Arc.

That said, with it being built atop Firefox, if you're moving over to it from Google Chrome or Safari, you're most notably going to notice how many browser extensions you use that don't exist in Firefox more than anything:

Only 2 of 29 extensions ported over

It's also built by a much smaller team, so you really have to just be somebody that absolutely loves Firefox, and wants to use a modern spin on that. That said, if youwant an Arc-like experience without the bugs? Just use Arc instead.

Comet Browser vs Zen Browser

Comparison Summary

At a Glance

Recommended Alternatives

Editor's Verdict

Screenshots

Summaries

Browser Alternatives