Sigma
A private AI browser that brings agent automation, chat, local AI, and ad blocking into one app.
About Sigma
Sigma is a private AI browser that combines ordinary web browsing with an AI agent, an AI chat workspace, and a local language model called Eclipse. The agent can navigate pages, fill forms, and carry out multi-step browser tasks, while chat supports questions, page summaries, deep research, writing, file analysis, and image generation. Eclipse runs on the device for work that users do not want sent to cloud servers. A built-in ad blocker and mnemonic profile add browsing and identity controls. Sigma is available for macOS, Windows, and mobile platforms. The free tier covers the main chat experience with limits on agent runs, image generation, search, writing, and deep research. Plus raises those allowances for $8 per month at the displayed discounted rate, and Pro Unlimited costs $60 per month at the displayed discounted rate with unlimited access to most listed AI tools. Prospective users should weigh the convenience of AI inside the browser against usage caps on lower tiers and the fact that some tasks still depend on cloud-backed features.
Best for
Best use cases
Summarize a long page and ask follow-up questions without copying its contents elsewhere.
Delegate navigation and form entry during a repetitive, multi-step web task.
Draft or analyze sensitive material locally with Eclipse when cloud processing is unsuitable.
Compare before choosing
Choose Free to test the workflow when limited agent, research, and generation allowances are sufficient.
Choose Plus for higher recurring allowances and unlimited prompts or Text Writer at a lower monthly cost than Pro.
Choose Pro Unlimited when unlimited agent, search, research, file, and image use matters more than the $60 monthly price.
Features
Research and page reading
Question the current page, generate a detailed summary, analyze attached files, and continue a deeper web investigation without moving the work into a separate chat app.
Browser task automation
Ask the AI agent to navigate several pages, complete forms, manage intermediate steps, and carry a repetitive browser task through to a usable result.
Local private analysis
Use Eclipse for supported writing, reasoning, summaries, and page analysis while keeping prompts and source material on the user’s own device.
Pros
- The free plan lets users test chat, page analysis, research, and agent workflows before paying.
- Eclipse can process supported prompts locally, which reduces cloud exposure for sensitive browsing work.
- The browser combines page chat, file analysis, search, writing, images, and task automation in one workflow.
Cons
- The free plan limits AI Agent access, deep research, image generation, search, and writing usage.
- Plus still uses multiplied allowances for several tools instead of unlimited access, so heavy users may need Pro.
- Local processing applies to Eclipse, while other AI and web features may still rely on online services and require users to distinguish the two modes.
Pricing Plans
Free
- Chat on all platforms
- Analyze text, images and files
- Limited AI Agent access
- Limited image generation, TG Search and Text Writer
- Chat With Page
- Limited Deep Research
- Animate Images
Plus
- Unlimited prompts
- Unlimited Text Writer
- 50x more file uploads
- 10x more Web Searches
- 20x more Image Generations
- 12x more Deep Researches
- 25x more TG Searches
- 5 more AI Agent uses
- 5x more Animate Images
- Early access to new features
Pro Unlimited
- Unlimited file uploads
- Unlimited Web Search
- Unlimited Image Generation
- Unlimited Deep Research
- Unlimited TG Search
- Unlimited AI Agent
- 25x more Animate Images
- Early access to new features
* Pricing information is for reference only. Please refer to the latest announcement on Sigma's official website.