Best AI Browsers in 2026 (Including One That's Not a Browser)
Six months ago there were zero AI browsers. Now there are at least six, and every one of them wants you to stop using Chrome.
I spent the past few weeks switching between Comet, Atlas, Dia, Genspark, Sigma, and Fellou as my daily driver. Some are genuinely good. Some are confusing. And the biggest insight I walked away with has nothing to do with any of them.
But let’s start with what’s actually out there.
Comet (Perplexity)
Comet is the one most people have heard of. Built by Perplexity, Chromium-based, launched mid-2025. It’s free if you have a Perplexity account, with a $5/month Comet Plus tier that gives you access to paywalled articles from outlets like The Washington Post and CNN.
The AI assistant is baked into everything. You can ask it to summarize a page, research a topic, draft emails, compare products. It can interact with your tabs, navigate links, and handle multi-step tasks like booking a service or completing a shopping flow. Of all the AI browsers I tested, Comet was the strongest for research and shopping workflows specifically.
The good: it supports Chrome extensions, which is a huge deal. Most of your existing setup carries over. The research experience is notably better than chatting with an AI in a separate tab because the browser itself understands the page context.
The bad: it’s still buggy on complex pages. Multi-step agentic tasks fail more often than they should. And you’re locked into Perplexity as your AI provider — no switching to Claude or GPT if you prefer a different model.
Atlas (OpenAI)
Atlas is OpenAI’s browser. Chromium-based, launched October 2025, feels like Chrome with ChatGPT embedded everywhere. Instead of going to chatgpt.com, the AI lives in a sidebar and can see the page you’re on. You can @ mention other open tabs to pull cross-tab context into your queries, and your search history merges with ChatGPT’s memory about you — which is genuinely useful once it accumulates.
This is the most recognizable brand in the list, and the marketing makes it look incredible. But here’s the thing most reviews won’t say clearly: the features you see in the demos require ChatGPT Plus ($20/month) or Pro ($200/month). The free version is severely limited. The agentic Agent Mode — where it navigates, fills forms, compares products across tabs — is frequently unreliable. MIT Technology Review published a piece literally titled “I still don’t know what it’s for.” It’s also macOS only (Apple Silicon M1+) with Windows expected sometime in 2026.
If you’re already paying for ChatGPT Plus, Atlas gives you a tighter integration between GPT and your browsing. That’s real value. But it still locks you into one model (GPT), it only runs on Mac, and the browser itself doesn’t bring much beyond what a good Chrome extension could do with the same API access.
Dia (The Browser Company)
Dia comes from the team behind Arc, which was the darling of the productivity crowd for a while. They pivoted hard into AI, launched Dia in beta mid-2025, and then Atlassian acquired the company for $610 million.
The AI assistant lives in the URL bar, which is an interesting UX choice. Type a question instead of a URL and you get an AI answer. Dia is designed to feel more like Chrome than Arc did — less radical, more approachable. It’s starting to pull in Arc’s best features: sidebar mode, vertical tabs, custom shortcuts. It also has local data encryption and granular AI access controls, which is a nice touch.
Important distinction: Dia is intentionally not agentic. It’s a “high-context copilot” — it can read and summarize pages, transform text, and run tasks across your open tabs, but it won’t autonomously click buttons or fill forms on arbitrary websites. If you want AI that acts on pages for you, Dia isn’t trying to be that.
Pricing: $20/month for “Dialed In” with unlimited AI features. Free tier has usage limits. macOS only for now, and Chrome extension support is still limited.
The honest take: Dia has potential, but it’s still early. The Atlassian acquisition ($610M) positions it as a potential enterprise/workplace browser, which might mean it gets more polished or might mean it gets swallowed into Jira integrations. And $20/month for a non-agentic AI copilot feels steep when free alternatives exist.
Genspark
Genspark is trying to be more than a browser. It has AI Slides for building presentations, AI Sheets for data analysis, Deep Research that runs extensive multi-source investigations, and a feature called Call for Me that can literally place phone calls on your behalf.
The ambition is impressive. The credit system is confusing. Free users get 100-200 credits per day (enough for maybe 3-8 tasks), the Plus plan is $25/month with 12,000 credits, and Pro is $249/month for power users.
Of the six browsers, Genspark felt the most like a platform pretending to be a browser. If you need the full suite of AI productivity tools and want them all in one place, it’s worth trying. But as a browser replacement? It’s overkill for most people.
Sigma
Sigma positions itself as the privacy-focused AI browser. It includes SigmaGPT for content generation, a summarizer, an AI image generator, and Deep Research that pulls from journals and datasets. End-to-end encrypted AI conversations, no trackers, GDPR and CCPA compliant. It’s also open-source, which none of the others are.
Pricing is the most accessible: free tier with core features, Pro plan at $9.99/month. Available on Windows, macOS, iOS, and Android — the broadest platform support of any AI browser.
The privacy angle is genuine and welcome in a category where most competitors are building data moats. But the agentic features are still in early access and not as mature as Comet’s. If privacy is your top concern and you want a standalone AI browser, Sigma is the obvious choice. If you need reliable agentic capabilities today, it’s not quite there yet.
Fellou
Fellou is the most explicitly agentic of the bunch, built by ex-DeepMind and Mozilla engineers. Describe what you want done in natural language and it breaks it into steps and executes across multiple platforms simultaneously. It can do deep search across your logged-in accounts — X, Reddit, Salesforce, whatever.
Free for up to 4 tasks (yes, four total), then $20/month for the Plus plan, going up to $199/month for heavy usage. macOS only currently, Windows “coming soon.”
Performance is hit-or-miss. When it works, the cross-platform automation is genuinely impressive. When it doesn’t — and it gets stuck on complex layouts or loops more often than you’d like — you’re left with a half-completed task and no easy way to pick up where the AI left off.
The quick comparison
| Browser | Paid Price | Agentic | Platforms | Chrome Ext. Support | Model Lock-in |
|---|---|---|---|---|---|
| Comet | $5/mo (content add-on) | Yes | Mac, Win, Android, iOS | Yes | Perplexity only |
| Atlas | $20-200/mo (ChatGPT sub) | Yes (unreliable) | Mac only | Unknown | OpenAI only |
| Dia | $20/mo | No (copilot only) | Mac only | Limited | Proprietary |
| Genspark | $25-249/mo | Yes | Mac, Win, Android | Has Chrome ext. | Multi-model |
| Sigma | $9.99/mo | Early access | Mac, Win, iOS, Android | Unknown | SigmaGPT |
| Fellou | $20-199/mo | Yes (most aggressive) | Mac only | No | Multi-model |
The thing nobody is saying out loud
Every one of these AI browsers asks you to do something significant: abandon your current browser.
That means re-importing your bookmarks, re-installing your extensions (if they’re even supported), re-configuring your settings, re-learning the UI. And then trusting that this new browser — built by a startup that might get acquired, pivot, or shut down — will be your daily home for the foreseeable future.
Dia’s team got acquired by Atlassian seven months after launch. Arc, its predecessor, was effectively abandoned. The browser market is brutal and even well-funded teams struggle to maintain long-term commitment to a standalone browser product.
So here’s the question I kept coming back to:
Do you actually need a new browser? Or do you just need AI inside the browser you already use?
The extension approach
There’s a category of tools that takes the opposite approach: instead of building a new browser with AI baked in, add AI to the browser you already have.
Dassi is one of these. It’s a Chrome extension that lives in the side panel. It can see the page you’re on, interact with it, fill forms, extract data, navigate complex web UIs, draft emails — the same agentic capabilities that AI browsers are marketing as revolutionary.
The difference: you don’t switch browsers. You keep Chrome, keep your extensions, keep your settings. And you’re not locked into a single LLM — bring your own API key for GPT, Claude, Gemini, DeepSeek, or whatever model you prefer. You can even log in with your existing ChatGPT subscription with no API key needed.
Yes, I realize this is on the dassi blog, so take it with the appropriate grain of salt. But the architectural argument stands regardless of which specific extension you use: browser-native AI doesn’t require you to abandon your setup.
The AI browser pitch is “we built AI into a browser.” The extension pitch is “we brought AI to YOUR browser.” The end result is similar. The switching cost is not.
So which should you pick?
If you want the most polished standalone AI browser experience and don’t mind vendor lock-in: Comet. It’s free, the research features are strong, and Chrome extension support means less migration pain.
If you’re already deep in the OpenAI ecosystem and paying for ChatGPT: Atlas gives you tighter integration, though the free tier is underwhelming.
If you loved Arc and want its spiritual successor: Dia, but know that it’s deliberately not agentic, $20/month adds up, and the Atlassian acquisition makes the long-term roadmap uncertain.
If you need an AI platform more than a browser: Genspark, though the credit system is annoying.
If privacy matters most: Sigma — open-source, encrypted, and at $9.99/month the cheapest paid option.
If you want aggressive agentic automation: Fellou, but set expectations for reliability and know you’re on macOS only.
If you don’t want to switch browsers at all: an AI browser agent extension like dassi. No migration, no lock-in, works with any LLM.
The AI browser category is real and growing fast. But the question worth asking before you switch isn’t “which AI browser is best?” — it’s whether you need a new browser in the first place.