Official comparison · Free download

Tabbit vs Sigma

Two different visions of an AI browser. Sigma keeps your data local and private. Tabbit turns the browser into an autonomous coworker that completes tasks across the web.

Tabbit

Choose Sigma if you want a lightweight, privacy-first browser with local AI. Choose Tabbit if you want the browser to research, fill forms, and run workflows for you.

Opens tabbitbrowser.com or tabbit-ai.com based on your language.

Quick verdict

Which browser fits your workflow?

Privacy & local AI first

You want a private browser where sensitive data stays on-device and AI runs locally.

Sigma Browser

Automate web tasks

You need a browser that can research, summarize, fill forms, and run multi-step workflows.

Tabbit

Multi-model AI + workspaces

You want Agent mode, vertical tabs, workspaces, and access to several top-tier AI models.

Tabbit
Side-by-side

Tabbit vs Sigma at a glance

Both browsers add AI to browsing, but they optimize for very different goals.

FeatureTabbitTabbitSigma
Core promiseAI-native browser that executes web tasksPrivate AI browser with local, on-device intelligence
EngineChromium-basedChromium-based
Agent modeYes — autonomous multi-step tasks in parallel tab groupsLimited; mainly page chat and local assistants
AI modelsGemini, GPT, Claude, DeepSeek, GLM, Kimi, Qwen, Doubao, LongCatProprietary / local offline model
Tab managementVertical tabs + smart workspaces + AI groupingVertical tabs + private profiles
Context sharingOmnibox @ mentions for tabs, screenshots, filesTraditional copy-paste / local context
Automation scriptsSkills — prompt & script shortcuts, community galleryBuilt-in ad block, page chat, quick translate
Open sourceProprietary (free during public beta)Open-source components, privacy-first
Privacy focusUser data stays yours, standard product privacyPrivacy-first, local AI, mnemonic profile, minimal telemetry
PriceFree during public betaFree
PlatformsmacOS & WindowsmacOS, Windows, iOS & Android
Sigma Browser

What Sigma does best

Sigma Browser is a privacy-first AI browser that emphasizes local intelligence, light weight, and minimal data collection. It is a strong choice for users who want AI assistance without sending everything to the cloud.

  • Privacy-first design with local / offline AI processing
  • Built-in ad blocker and tracker protection
  • Mnemonic profile for secure, portable browser identity
  • Page chat, quick translate, and private profiles
  • Available on desktop and mobile
Tabbit

What Tabbit does best

Tabbit is an AI-native browser built by the GN06 team. It keeps familiar browser mechanics but adds an Agent mode that can open its own tab groups and execute complex web workflows from natural language.

  • Agent Mode runs multi-step tasks while you keep working
  • Omnibox with @ mentions — tabs, screenshots, and files become context
  • Skills marketplace for reusable prompts and scripts
  • Vertical tabs, smart workspaces, and knowledge-base bookmarks
  • Free access to top-tier AI models during public beta
Feature highlights

Where the two browsers diverge

Privacy vs productivity

Sigma optimizes for privacy and local AI. Tabbit optimizes for task execution and multi-model productivity.

Agentic execution

Tabbit can log into sites, fill forms, extract data, and deliver reports. Sigma focuses on page-level chat and local assistance.

Model ecosystem

Tabbit gives you a choice of global and domestic top models. Sigma uses a proprietary or offline model tuned for privacy.

Cross-platform reach

Sigma is available on mobile. Tabbit currently focuses on desktop macOS and Windows for deep work.

Use cases

Pick the right browser for your scenario

Privacy-sensitive browsing

You want local AI, minimal cloud data, and a lightweight browser.

Winner: Sigma

Research & reporting

You need the browser to search dozens of pages, summarize findings, and export a structured report.

Winner: Tabbit

Repetitive web workflows

You regularly fill forms, check dashboards, or move data between web apps.

Winner: Tabbit

Mobile AI browsing

You want an AI browser on iOS or Android.

Winner: Sigma
FAQ

Frequently asked questions

It depends on your priority. Tabbit is better for automating web tasks and using multiple top AI models. Sigma is better if you want a lightweight, privacy-first browser with local AI.
Sigma focuses on page chat, local AI, and privacy features. It does not currently offer the same autonomous multi-step task execution as Tabbit Agent Mode.
Yes. Tabbit is free during its public beta, with access to top-tier AI models including Gemini, GPT, Claude, DeepSeek, GLM, Kimi, Qwen, Doubao, and LongCat.
Sigma promotes open-source and privacy-first values. Check its official site for the latest licensing details.
Sigma is explicitly designed around privacy, local AI, and minimal telemetry. Tabbit also emphasizes that your data stays yours, but its Agent features may process context through cloud models.
Tabbit currently supports macOS and Windows. Sigma has desktop and mobile apps for iOS and Android.
Tabbit supports one-click import from Chrome, Edge, Safari, and other major browsers, including bookmarks, passwords, history, cookies, and extensions.
For work automation — such as research, data extraction, form filling, and multi-step workflows — Tabbit is the stronger choice thanks to its Agent Mode and Skills.

Try the browser that does the work for you

Download Tabbit free and see how Agent Mode, Skills, and multi-model AI can change the way you work on the web.