The Aside Browser: An AI Agent That Completes Your Tasks Inside Your Accounts, No Integrations

"The browser is not just a window, but the place where work happens now." With this idea, the Y Combinator-backed startup Aside presents its new browser, launched this week, describing it as an "operating system for the AI era." The central idea: a browser that does not merely display pages, but completes your tasks within them on your behalf, through your actually logged-in accounts.

An Agent That Works From the Inside, Not the Outside

Aside criticizes current AI agents for "working from the outside": they ask you to connect dozens of integrations, ask about your context every time, and stop at every step requesting permission. Aside's approach is radically different: the browser uses websites and your accounts directly, exactly as you do by hand. No integrations, but actual logins to Gmail, Notion, Slack, Figma, and even banking apps and companies' internal tools.

In practice, this means you can ask the browser a complex task — like replying to comments, following up on conversations, or even completing a payment — and it executes it from start to finish. The company describes this as "the only wall is your imagination."

How Does It Achieve That?

Aside is built on several building blocks. It turns passwords, sessions, and passkeys into tools the agent acts with to log in and execute. It turns browsing history into "memory" that gives the agent persistent context across sessions, so it does not start from scratch each time. And it turns push notifications into a "heartbeat" that lets the agent react to events and resume work in real time. As for the user experience, it bets on the details: vertical tabs and a "Liquid Glass" design, with the ability to choose the AI engine among models like GPT or Claude.

Performance Claims... Between Enthusiasm and Caution

Aside says it ranked first on three browser-agent benchmarks — Online-Mind2Web, BU-Bench-V1, and Odysseys — surpassing agents from OpenAI, Anthropic, and Browser Use, and even outperforming the Claude Fable model. But these numbers deserve a careful reading: their source is the company itself, not yet verified by a neutral, independent party. Adding to the ambiguity, Fable 5 is itself disabled for the public after the US export controls, making a direct comparison with it hard to verify. Treating these claims as a promising signal rather than a proven fact is the safest stance.

Privacy: A Strength and a Source of Concern at Once

Aside heavily emphasizes privacy, an important angle because a browser that holds your passwords and acts with them raises obvious security questions. The company says everything runs locally on your device by default: tasks, memory, and data stay on the device and are not shared with model providers. Everything is encrypted via the Secure Enclave and post-quantum encryption, and the agent runs in a sandbox that isolates filesystem and network access. Most importantly, it asks for your review before sensitive actions rather than executing them silently.

Nonetheless, granting any program permission to use your passwords and complete payments on your behalf remains a decision requiring high trust and a precise understanding of the risks, however strong the encryption guarantees. Local privacy protects against data leaking outward, but it does not eliminate the risks of an error in executing a sensitive task.

Amid the "Browser Wars"

Aside does not arrive in a vacuum, but amid a rising wave of new browsers challenging the dominance of Chrome and Safari: Perplexity's Comet, Dia from the makers of Arc, the open-source Ladybird, and the "calm browser" Zen. What distinguishes Aside in this crowd is its bet on full automation without integrations — that is, the browser acting on your behalf rather than just helping you. The company, founded in 2024 by three engineers in San Francisco, bets that most modern software has become "just a tab," and that whoever controls the browser controls the entire work layer.

How Does It Compare to Its Rivals? Aside vs. Atlas and Comet

The three best-known agentic browsers share one goal — making the browser work on your behalf — but they differ radically in philosophy and execution. OpenAI's ChatGPT Atlas (launched October 2025) is built on Chromium and integrates ChatGPT into a persistent sidebar, with its strength in "Agent Mode" for multi-step tasks like filling forms and compiling research, but it requires manually activating the agentic mode for each task, and many independent reviews described it as slow and closer to "ChatGPT inside a browser" than a browser rebuilt from the ground up. Perplexity Comet (free since October 2025, also on Chromium) leans more toward research and source-grounded retrieval, is the fastest of the three for quick lookups, and handles tasks without requiring a separate mode to be activated, but it is weaker at long, complex automation.

By contrast, Aside, the newest of them, adopts the most radical approach: instead of "helping" the user, it acts entirely on their behalf inside their logged-in accounts with no integrations, using passwords and sessions directly as a human does, with encrypted local execution on the device setting it apart on privacy. The core difference can thus be summed up like this: Comet searches for you, Atlas helps you work, and Aside tries to work instead of you. The more delegation, the more capability — and with it, the more security risk, especially when it comes to handing over passwords and payments. It is worth noting that describing Atlas as slow comes from independent reviews, while Aside's full superiority remains a claim not yet verified by independent reviews given its recency.

The practical question remains open: does Aside actually succeed where other agents stumble — namely, completing a task to its end without stopping? That is precisely its core promise, and it is what real-world use and independent reviews in the coming weeks will judge, not the announcement alone.