Steel
Open-source browser API for large-scale cloud management, providing a REST/WebSocket service for AI agents and web crawlers
Visit Website ↗What is Steel
Steel (steel.dev) is an open-source headless browser API designed to provide a foundation for AI agents, web crawlers, and automation tools to interact with the web. It wraps Chromium in a managed REST and WebSocket API, handling the complexities of running browsers at scale, including session management and infrastructure complexity, allowing developers to focus on writing agent logic without worrying about maintaining a browser cluster.
Steel is fully open-source under the Apache 2.0 license, allowing for self-hosting without licensing fees, with only the cost of hosting; an official cloud-hosted version is also available. Developed by a team based in Toronto, Canada, co-founded by Hussien Hussien and Nasr Mohamed, with approximately $17 million in funding. For developers looking to create agents that can interact with the web or teams looking to scale their web crawling and automation efforts, Steel standardizes the browser infrastructure into an API.
Features and Use Cases
The open-source version of Steel is completely free (with self-hosting costs); the cloud-hosted version has a free tier (100 hours per month), with paid plans starting at approximately $29 per month, and a popular plan at around $99 per month, including credits, browser hours, proxy bandwidth, and CAPTCHA solving. The biggest advantage of Steel is its open-source nature and the ability to self-host, giving developers the choice: complete control with self-hosting or convenience with the cloud-hosted version. It's suitable for teams that want to automate web interactions with agents while retaining the flexibility to self-host and avoid vendor lock-in; less suitable for individuals running small crawlers that can be handled with local solutions like Playwright or those looking for fully managed services (for whom the cloud-hosted version might be more appropriate). Among the competition in browser infrastructure, Steel stands out with its open-source approach and transparent pricing.
Key Features
- Open-source headless browser API with Apache 2.0 license
- Wraps Chromium in a managed REST and WebSocket service
- Self-hosting available without licensing fees, with cloud-hosted version also available
- Supports large-scale parallel session management
- Cloud-hosted version includes proxy bandwidth and CAPTCHA solving credits
Pros
- Completely open-source and self-hostable, avoiding vendor lock-in
- Self-hosting only incurs hosting costs, with a free tier available for the cloud-hosted version
- Standardizes browser infrastructure into an API, reducing maintenance
Cons
- Self-hosting requires maintaining and scaling infrastructure
- Local solutions might be simpler for lightweight crawling needs
- Coverage for complex, multi-step tasks still needs improvement
Use Cases
- Providing a browser foundation for AI agents to interact with websites
- Scaling web crawlers and automation that require browser rendering
- Teams looking to self-host and control their browser infrastructure
- Adding 'AI-operated web functionality' to product backends
Editor's Note
Editor's note: The browser infrastructure space became highly competitive by 2025, with Steel differentiating itself through its open-source approach, Apache 2.0 licensing, and transparent pricing, giving developers the choice and control they desire. Rated 4.2; while self-hosting requires maintenance and there's room for improvement in handling complex tasks, for teams not wanting to be locked into a single vendor, Steel is a valuable option to consider.
FAQ
Does self-hosting Steel incur costs?
No licensing fees are required. The open-source version under Apache 2.0 means you only pay for your hosting costs; if you prefer not to manage infrastructure, you can use the cloud-hosted version, which includes a free tier.
How does Steel differ from Kernel and Browserbase?
Steel emphasizes its open-source nature and the option to self-host, putting the choice in the developer's hands. If rapid cold start or fully managed convenience is a priority, comparing Steel with Kernel, Browserbase, and other solutions based on these trade-offs is recommended.