Agent SubstrateGoogle
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KitesurfCloudflare
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Related Products
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About
Agent Substrate is an open-source runtime for operating isolated, stateful agent and code-execution sandboxes on Kubernetes. It coordinates actor and worker lifecycles, places active workloads on a shared pool of ready capacity, and can suspend idle environments while preserving memory and filesystem state for later resumption. Sandboxes use gVisor or Cloud Hypervisor microVM isolation, with per-actor identity and network controls. Agent Substrate is designed for platform and infrastructure teams building agent-hosting services, coding environments, and other workloads that execute untrusted or intermittent tasks. The core project is Kubernetes-portable; Google Cloud also provides GKE-optimized deployment tooling. Optional Filestore agent volumes can persist workspaces across suspend and resume cycles.
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About
Kitesurf is an agent-first browser built specifically for AI agents and runs entirely on Cloudflare Workers instead of using Chromium. It is designed around what agents actually need: structured machine-readable content, scalable execution, low CPU and memory use, and safe interaction with untrusted web pages, rather than human-facing features such as tabs, themes, extensions, or pixel-perfect scrolling. Each page load is treated as untrusted input, every session starts fresh, and components are isolated with access only to the resources required for their function. Kitesurf uses native Rust compiled to WebAssembly where possible and is organized around an Engine, PageScript, and PageRenderer. The Engine exposes Chrome DevTools Protocol WebSocket and REST APIs and stores session state, while PageScript parses HTML and CSS and runs JavaScript and WebAssembly inside isolated Workers.
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Platforms Supported
Windows
Not Supported
Mac
Not Supported
Linux
Supported
Cloud
Not Supported
On-Premises
Supported
iPhone
Not Supported
iPad
Not Supported
Android
Not Supported
Chromebook
Not Supported
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Platforms Supported
Windows
Not Supported
Mac
Not Supported
Linux
Not Supported
Cloud
Supported
On-Premises
Not Supported
iPhone
Not Supported
iPad
Not Supported
Android
Not Supported
Chromebook
Not Supported
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Audience
Platform and infrastructure teams building services that run isolated agent or code-execution workloads on Kubernetes.
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Audience
AI agent developers that need a scalable browser runtime optimized for programmatic web navigation, structured content extraction, and automated browsing
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Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Not Supported
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Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Supported
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API
Offers API
Supported
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API
Offers API
Supported
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Screenshots and Videos |
Screenshots and Videos |
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Pricing
$0
Agent Substrate on GKE is offered at no extra charge. GKE pricing applies to the resources you create.
Free Version
Supported
Free Trial
Not Supported
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Pricing
$20
Free Version
Supported
Free Trial
Not Supported
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Reviews/
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Reviews/
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Training
Documentation
Supported
Webinars
Not Supported
Live Online
Not Supported
In Person
Not Supported
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Training
Documentation
Supported
Webinars
Supported
Live Online
Not Supported
In Person
Not Supported
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Company InformationGoogle
Founded: 1998
United States
github.com/agent-substrate/substrate
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Company InformationCloudflare
Founded: 2009
United States
blog.cloudflare.com/kitesurf/
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Alternatives |
Alternatives |
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Categories |
Categories |
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Integrations
CSS
Not Supported
Chrome DevTools
Not Supported
Chromium
Not Supported
Cloudflare
Not Supported
Google Cloud Filestore
Supported
Google Cloud Platform
Supported
HTML
Not Supported
JavaScript
Not Supported
Model Context Protocol (MCP)
Supported
WebAssembly
Not Supported
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Integrations
CSS
Supported
Chrome DevTools
Supported
Chromium
Supported
Cloudflare
Supported
Google Cloud Filestore
Not Supported
Google Cloud Platform
Not Supported
HTML
Supported
JavaScript
Supported
Model Context Protocol (MCP)
Not Supported
WebAssembly
Supported
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