Google Project Mariner vs Steel (2026)
Updated March 10, 2026
Overview
Google Project Mariner brings agentic browsing directly into Chrome, powered by Gemini. It can understand and interact with web pages — reading content, clicking buttons, filling forms, and navigating across sites. As a native Chrome feature for AI subscribers, Project Mariner represents the shift of browser agents from standalone tools to built-in browser capabilities, leveraging Google's unmatched understanding of web structure.
Steel is an open-source browser API and sandbox designed for AI agents. It provides managed browser sessions with authentication persistence, anti-detection, and debugging tools, handling the infrastructure complexity of running browsers at scale for autonomous AI workflows.
Strengths and tradeoffs
What each tool does well, and the limitations to keep in mind.
Pros
- Multimodal understanding allows parsing of text, images, buttons, forms, and code on web pages
- Teach & Repeat feature enables learning custom workflows by demonstration
- Can execute up to 10 parallel tasks for comparing prices or gathering data from multiple sources
- Powered by Gemini 2.0, providing advanced AI capabilities and reasoning
- Integration with Google's ecosystem provides access to additional tools and features
Cons
- Premium pricing at $249.99/month is significantly higher than most consumer AI subscriptions
- Currently limited to US users, though expanding to more countries
- Still experimental with slow performance and prone to roadblocks like CAPTCHA or login issues
- Cannot fill out credit card numbers, billing information, accept cookies, or sign terms of service
- Requires significant computational resources with virtual machine architecture
Pros
- Production-ready
- Good performance
- Active development
Cons
- Pricing varies
- Setup required
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