Comparison: four AI browsers on the test bench

Comet, Fellou, Genspark AI Browser Plus and Opera Neon understand natural language, plan and execute autonomous actions to achieve a goal.

If we know about AI-boosted search engines, agentic browsers go much further. They interpret natural language, execute and adapt their actions. Their main aspects are autonomy, the ability to act towards a goal and adaptability to the environment. We selected 4, focusing on agentic features, available connectors, security and cost.

Comet

Comet, Perplexity’s browser, is gradually rolling out. It was built using the code base of Chromium, the open source web browser project primarily run by Google. Naturally, it uses Perplexity as its default search engine. Of the agentic browsers tested, this is the one that seemed the most operational to us. Even if the company created by four former Google AI employees believes it needs to further improve its tool.

Comet implements a series of agentic features via a side panel. The browser also includes a memory and organization module. The agent can thus interact directly with the DOM (Document Object Model) of the navigation environment. Among the possible tasks: manage the auto-filling of forms, execute e-commerce transactions (shopping cart management, application of promotional codes), or even generate content for social media platforms. The system incorporates frequent user validation mechanisms for actions deemed critical.

In addition, Comet offers connectors such as Gmail, Gmail with Calendar and WhatsApp, according to our tests. Natural language queries allow, for example, calendar analysis to suggest meeting slots. You can ask: “Check my calendar and come up with three slots for a meeting with Paul next week.” Or “Find my Amazon order confirmation email and let me know when it arrives.” However, be careful with the sensitive information communicated. If Comet explains that it stores history locally and does not use personal data to retrain its models, the browser remains vulnerable, for example, to phishing attacks and theft of identifiers.

Comet offers a freemium version, with a Pro subscription at $20 excluding tax per month. On the menu, extended access to Perplexity Research and image generation. The “Max” version, at $200 excluding tax per month, offers unlimited access to Perplexity Labs and Perplexity Research

Fellou

Recently launched, Fellou presents itself as the “world’s first agentic space navigator”. It claims to introduce “a revolutionary Z axis to the user interface, giving tangible depth to your screen.” He also explains having obtained a “success rate of 72% on complex automation tasks, outperforming Manus (60%) and OpenAI (59%) in the Hallluminate Web Bench.”

In theory, Fellou can search, move or organize documents. It can create visual reports, slides or a calibrated summary. Custom workflows are possible with the Eko framework functionality. It allows developers to create more or less complex agents. These can work in different virtual workspaces.

Fellou also aims to be capable of collecting data and automating actions on platforms like Notion or LinkedIn. For example, it must allow you to upload your CV, request to analyze job sites and receive a personalized preselection of corresponding positions in Excel. It can also produce market research with sentiment analysis. Unfortunately, much of this failed in our testing. Beyond these promises, still in beta, Fellou was mainly noted for its unstable version and an impressive number of bugs. On the security side, note that although Fellou claims a “Local-First, Privacy-First” approach, the data remains vulnerable.

Price-wise, the platform adopts a freemium model. The $19.90 per month “Plus” model offers approximately 8 tasks and 3 scheduled tasks. The “Pro” version at $39.9/month, 20 tasks and 5 scheduled tasks, the “ultra” version at $199.9/month has unlimited access.

Genspark AI Browser

Genspark AI Browser presents itself as a serious competitor to Chrome, powered by AI. Like Comet, it works like a classic browser, with an AI agent component. “Autopilot” mode allows the browser to take action to accomplish background tasks.

In terms of agentic features, it can chain actions, such as consulting several data sites, extracting information and compiling it into a summary table, without manual intervention. On a product page, the agent can automatically search for better deals on other sites, compare similar products, or summarize customer reviews from forums and marketplaces.

Genspark Browser also has access to many connectors. For example, Notion, Microsoft 365Outlook, Microsoft OneDrive and Slack. MCP servers are not left out. For example, “X/Twitter Content Explorer” allows you to explore X/Twitter content directly through browser automation. “Local Web Fetch” allows access to web content using the local browser session. Please note to pay attention to the data shared. Security vulnerabilities have been reported in Genspark’s Android app. Genspark Browser also remains vulnerable to sophisticated web attacks. According to our tests, however, it presents an unstable version.

Price-wise, the free plan is less generous than that of Comet and Fellou. “Plus” mode, at around $20 per month, offers 50 GB of storage with AI Drive, priority access to all AI agents, and the latest image and video generation models. The “Pro” option, at about $200 per month, offers 1TB of storage with AI Drive and about 12 times more credits than the “Plus” plan.

Opera Neon

Opera Software launches its Opera Neon agentic browser, available for Windows and macOS. It is aimed more at experienced AI users. “We built Opera Neon for ourselves and for everyone who uses AI extensively in their daily lives,” said Krystian Kolondra, executive vice president of browsers at Opera.

Several AI agents are available. “Neon Chat” features the classic sculpin. “Neon Make” allows you to code a project. “Neon Do” can act with relative autonomy. For example, you can go to YouTube and ask “Find the video where Steve Jobs takes a Macbook Air out of an envelope. Skip to the exact point where this happens in the video.” The “Cards” functionality allows you to benefit from ready-to-use prompts. For example, the “pull-details+comparison-table” card added to your prompt allows you to compare products across multiple prompts. The “Tasks” AI agent, for its part, offers the ability to organize your work in compatible spaces, including tabs and AI services. These different AI agents can act together. It is possible to enable a VPN to prevent third parties from tracking you, although this may affect connection speed.

According to our tests, the possibilities are numerous, from booking at a restaurant to filling out forms. Note, however, that the interface is not very intuitive. Surprisingly, for a “history” of browsers like Opera, the UX also leaves something to be desired. It’s difficult, for example, in “Neon Do” to find the posted prompt.

Access is currently in advance and by invitation. Subscription pricing starts at around $20 per month.