Kitesurf

Kitesurf

Cloudflare
+
+

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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.

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.

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

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

Audience

Platform and infrastructure teams building services that run isolated agent or code-execution workloads on Kubernetes.

Audience

AI agent developers that need a scalable browser runtime optimized for programmatic web navigation, structured content extraction, and automated browsing

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Not Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

API

Offers API Supported

API

Offers API Supported

Screenshots and Videos

Screenshots and Videos

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

Pricing

$20
Free Version Supported
Free Trial Not Supported

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Training

Documentation Supported
Webinars Supported
Live Online Not Supported
In Person Not Supported

Company Information

Google
Founded: 1998
United States
github.com/agent-substrate/substrate

Company Information

Cloudflare
Founded: 2009
United States
blog.cloudflare.com/kitesurf/

Alternatives

Alternatives

Human Browser

Human Browser

Virix Labs
AssemblyScript

AssemblyScript

The AssemblyScript Project
VibeSDK

VibeSDK

Cloudflare
Sprites

Sprites

Fly.io

Categories

Categories

AI Browsers Supported

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

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
Claim Agent Substrate and update features and information
Claim Agent Substrate and update features and information
Claim Kitesurf and update features and information
Claim Kitesurf and update features and information