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Aside is a YC-backed agent browser designed to complete real work inside your logged-in accounts, with local memory, a benchmark-topping browser agent, and an agent password manager. Sigma is a free private AI browser built around local and offline AI, a built-in ad blocker, and Chromium compatibility across macOS, Windows, and Android. Tabbit offers free multi-model Agent Mode and reusable Skills on Mac and Windows.
Opens tabbit.ai or tabbit.com based on your language.
30-second verdict
Choose Aside if your priority is an agent that signs into your real accounts and finishes multi-step work on a macOS-leaning product. Choose Sigma if you want a free, private, light browser with local AI and broad platform coverage. Choose Tabbit for free multi-model Agent Mode, reusable Skills, and Chrome-compatible extensions on both Windows and macOS.
The third option
You do not have to pick between "private first" and "agent first." Tabbit brings multi-model agentic work, reusable Skills, and Chromium extensions to the Windows and macOS machines your team already uses.
At a glance
These browsers answer different questions: an agent that works inside your accounts, a private AI browser that stays light and local, and multi-model agent workflows on desktop. Plans and platforms change, so confirm details on each official site before switching.
Aside
Sigma
TabbitHead-to-head
The real question is not which browser "has AI." It is whether you need an autonomous worker inside your logged-in accounts, a private and light browser with local AI, or a free multi-model desktop agent.
Aside is built around agents that sign in through your real accounts, complete multi-step tasks, and keep memory locally; it reports top scores on browser-agent benchmarks. Sigma has an AI agent that navigates pages and fills forms, but unlimited agent use requires its Pro plan. Tabbit Agent Mode is designed for multi-step, multi-tab execution with reusable Skills.
Sigma is positioned around local and offline AI, a built-in ad blocker, open-source transparency, and GDPR/CCPA compliance. Aside keeps memory local, encrypts with Secure Enclave, and gates sensitive actions behind human approval. Tabbit keeps task context deliberate rather than silently coupling every account.
Sigma covers macOS, Windows, and Android, with chat across platforms. Aside’s public download path has leaned macOS. Tabbit covers Windows and macOS, the two primary desktop environments, but is not a mobile browser.
Aside lets you bring your own ChatGPT or Claude subscription or API key, so agent work runs on the models you already pay for. Sigma keeps its own bundled AI with local and cloud options. Tabbit lets you switch between GPT, Claude, Gemini, DeepSeek, Qwen, and more by task.
Sigma has a genuinely free tier that includes chat and limited agent access. Aside starts free with 500 credits per month, but heavy agent work scales into paid plans. Tabbit’s public beta lets you try multi-model Agent Mode and Skills without a paid seat.
The fork in the road
Community threads ask whether Sigma is safe, whether Aside is the "strongest" agent browser, and whether you even need an agent at all. The honest answer: it is a route choice, not a winner. Private-first means a light browser where your data and AI stay local; agent-first means a browser that acts inside your accounts for you.
Sigma emphasizes privacy: local and offline AI, a built-in ad blocker, TLS 1.3, and claims of end-to-end encryption and GDPR/CCPA compliance. As with any browser, check its current privacy policy and open-source repo before relying on it for sensitive accounts.
They are different routes. Aside wins when you need an agent to complete real work inside your logged-in accounts and are comfortable with a macOS-leaning product. Sigma wins when you want a free, private, light browser with local AI and broader platform coverage.
If your work is research, forms, and multi-step workflows across tabs, an agent layer saves time. If you mainly want private everyday browsing with AI assist, a private AI browser may be enough. Tabbit is the middle path: private habits plus a free multi-model agent when you need it.
Yes. Many people keep a private, light browser for everyday browsing and use an agent browser for specific work. Tabbit aims to cover both on desktop: Chromium-compatible extensions and Agent Mode on macOS and Windows.
Which one for you
Aside and Sigma are both Chromium-based AI browsers, but they are built for different routes. The better choice depends on whether you want an agent in your accounts, a private light browser, or a free desktop agent.
You want an agent that acts inside your logged-in tools, keeps local memory, and asks before sensitive steps. Confirm platform availability and plan limits on Aside’s official site.
You want a free browser with local/offline AI, an ad blocker, open-source privacy, and coverage on macOS, Windows, and Android.
You need a multi-model agent, reusable Skills, and Chrome-compatible extensions on both Windows and macOS without committing to a paid agent plan.
The honest part
Why Tabbit
Keep the browser habits you trust while adding a practical agent layer. Tabbit is for people who want more than private browsing but want to evaluate agent workflows before paying.
Run the same browser-agent workflow across the two desktop systems most teams depend on, instead of waiting for a Mac-leaning product or a mobile-first private browser.
Choose GPT, Claude, Gemini, DeepSeek, Qwen, and more by task—from research and drafting to forms and multi-tab execution.
Turn recurring instructions and browser routines into Skills, so useful workflows do not start from a blank prompt every time.
Keep the extension ecosystem you know and test free Agent Mode before deciding whether a paid agent plan is worth it.
FAQ
Aside is an agent browser built to complete real work inside your logged-in accounts, with local memory, a benchmark-topping browser agent, and an agent password manager. Sigma is a free private AI browser centered on local/offline AI, an ad blocker, and Chromium compatibility across macOS, Windows, and Android.
Not overall—they take different routes. Aside wins on autonomous agent work inside accounts but leans macOS and gates heavy agent use behind credits. Sigma wins on privacy-focused local AI, free-tier access, and broader platform coverage. For a third option, Tabbit combines free multi-model Agent Mode with Chrome-compatible extensions on Windows and macOS.
Sigma has a genuinely free tier with chat, text/image analysis, and limited AI agent access. Unlimited AI agent use requires the Pro plan at $60/mo, with a Plus tier at $10/mo in between.
Aside’s public download has leaned macOS. Check aside.com for current Windows support before adopting it across a team. Sigma supports macOS, Windows, and Android; Tabbit is available on Windows and macOS.
Yes. Sigma’s agent can navigate pages, fill forms, and manage tasks, with local AI and chat-with-page features. Free and Plus tiers are credit-limited; unlimited agent use sits in the Pro plan.
Choose Aside for macOS-leaning agent work inside logged-in accounts. Choose Sigma for a free, private, light browser with local AI on multiple platforms. Choose Tabbit for free multi-model Agent Mode, Skills, and Chrome Web Store compatibility on Windows and macOS.
Download Tabbit free for multi-model Agent Mode and Skills on macOS and Windows.