Extism

Extism

Dylibso
Kitesurf

Kitesurf

Cloudflare
+
+

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About

Extism is an open-source, universal plug-in system to make all software programmable, and it's powered by WebAssembly. In-depth documentation, constantly updated as the project grows. 15+ officially supported Host SDKs, making Extism embeddable in the most popular languages. 7+ officially supported PDKs, to write plug-ins in whichever language a developer would like. A growing set of runtime features makes Extism an excellent plug-in system for apps of all types & sizes. Fully-featured canonical reference demo with Elixir host SDK, and plugins in Rust, TypeScript, & Javascript. Implementation of a turn-based multiplayer game platform and games included to play and review. Games are implemented as WebAssembly modules containing a specific set of exports. Check out the source code on GitHub, download the installer, and get started. 100% open-source code. Fork it, experiment, & run your own game server.

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
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Audience

Developers searching for a free solution to write plug-ins for apps of all types and sizes

Audience

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

Support

Phone Support
24/7 Live Support
Online

Support

Phone Support
24/7 Live Support
Online

API

Offers API

API

Offers API

Screenshots and Videos

Screenshots and Videos

Pricing

Free
Free Version
Free Trial

Pricing

$20
Free Version
Free Trial

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
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

Dylibso
United States
dylibso.com/products/extism/

Company Information

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

Alternatives

AssemblyScript

AssemblyScript

The AssemblyScript Project

Alternatives

AssemblyScript

AssemblyScript

The AssemblyScript Project
VibeSDK

VibeSDK

Cloudflare
Nakama

Nakama

Heroic Labs

Categories

Categories

Integrations

JavaScript
WebAssembly
.NET
AssemblyScript
C
C++
CSS
Chrome DevTools
Chromium
Cloudflare
Elixir
Erlang
Go
HTML
Haskell
Java
OCaml
PHP
R
Zig

Integrations

JavaScript
WebAssembly
.NET
AssemblyScript
C
C++
CSS
Chrome DevTools
Chromium
Cloudflare
Elixir
Erlang
Go
HTML
Haskell
Java
OCaml
PHP
R
Zig
Claim Extism and update features and information
Claim Extism and update features and information
Claim Kitesurf and update features and information
Claim Kitesurf and update features and information