CowCo

CowCo is a browser-based editor for opening local project folders and viewing or editing many file types in one place. It is designed to work alongside an AI agent while keeping files on your computer rather than in the cloud.

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Overview

CowCo is a browser-based everything editor for local project folders. You open a folder on your device, and CowCo gives each file a viewer or editor in the browser so you can inspect and edit the project without switching into separate desktop apps for every file type.

The product is designed for a hybrid AI and UI workflow. The site says it works alongside your AI agent, lets you review or touch up changes in the same folder, and keeps files local on your computer rather than uploading them to a cloud service.

Features

Local folder editing

Open a folder from your device and work on its files directly in the browser, with no cloud upload according to the site.

Fast project navigation

Use a built-in text search across the project and a command palette to jump to files, content, and actions quickly.

Create files inside the project

Create new files in place, including images from a camera and audio from a microphone, without leaving the editor.

Broad file-type coverage

Choose from 18 built-in editors and viewers for 136 file types, covering common documents, code, media, and structured data.

Hybrid AI and UI workflow

Edit alongside an AI agent in the same folder so you can review, touch up, and respond to changes in the browser UI.

Specialized editors for different formats

Open supported files with purpose-built editors such as markdown, spreadsheet, audio, video, SVG, Mermaid, and SQLite views.

Use cases

Inspect mixed project folders
Open a project folder and review many file types in one place instead of jumping between separate editors for documents, media, code, and data files.
Pair with an AI agent
Work with an AI coding assistant on the same folder, then inspect and adjust the changes directly in the browser UI.
Navigate a large codebase or content set
Search a large folder, use the command palette, and jump straight to files or matching lines when you need to move quickly through a project.
Create and convert files in place
Create or duplicate files in the right format, such as generating a new image, recording audio, or converting view-only files into editable copies where supported.

Pros and Cons

Pros

Keeps work local on your computer and does not present itself as a cloud service.
Provides dedicated viewers and editors for many common file types in one browser app.
Supports a workflow where a human and AI agent work in the same project folder.
Includes search and command-palette navigation for moving around large folders.
Covers a wide range of formats, including documents, spreadsheets, media, code, PDFs, and databases.

Cons

The product is offered as-is with no warranty and is described as a personal project, so it is not supported software.
The site says it may change or break at any time, so it should not be relied on for critical operations.
Some file types are view-only or require duplication into another format before editing.

FAQ

Does CowCo upload my files to the cloud?

CowCo opens a folder on your device directly in the browser and works on the files in place. The site states that nothing leaves your computer and that it is not a cloud solution.

Which browsers does CowCo support?

Yes. The release notes and about page say CowCo works in Chrome and Arc on the desktop.

How does CowCo fit with an AI coding workflow?

CowCo is built for a hybrid workflow where an AI agent edits the same folder while you review and adjust files in the browser. The about page names Claude Cowork and Claude Code as examples of agents people may use alongside it.

What kinds of files can CowCo handle?

CowCo lists 18 built-in editors and viewers covering 136 file types, including documents, spreadsheets, slides, images, audio, code, PDFs, and more. Some formats are view-only, while others can be edited or duplicated into an editable format.