Wails
By Wails contributors
Wails is a framework for building desktop applications using a Go backend paired with a web-technology front end rendered in an embedded native browser view, rather than a bundled Chromium runtime. It lets developers write application…
Definition
Wails is a framework for building desktop applications using a Go backend paired with a web-technology front end rendered in an embedded native browser view, rather than a bundled Chromium runtime. It lets developers write application logic in Go and the user interface in HTML, CSS, and JavaScript or a front-end framework like React or Vue, with Wails handling the bridge that lets JavaScript call Go functions and vice versa. Wails is used to build cross-platform desktop applications with a smaller binary and memory footprint than frameworks that ship a full embedded browser engine.
Overview
Wails was created to give Go developers a way to build desktop GUI applications using familiar web front-end tools, addressing the fact that Go's own native GUI options, such as Fyne or Gio, require learning a Go-specific widget API rather than reusing existing HTML, CSS, and JavaScript skills or an existing web front-end codebase. It positions itself most directly against Electron, the dominant framework for building desktop apps with web technologies, but takes a different approach to how the UI is actually rendered on screen. Mechanically, Wails compiles a Go backend into a native binary and renders the front end using each operating system's built-in web view component — WebView2 on Windows, WebKit on macOS and Linux — rather than bundling a full copy of the Chromium browser engine inside every application, which is what Electron does. This design choice is Wails's central technical differentiator: it produces smaller application binaries and lower baseline memory usage since it relies on a web-rendering engine already present on the operating system, at the cost of the front end sometimes behaving very slightly differently across platforms because each OS's web view implementation is not identical. Communication between the Go backend and the JavaScript front end happens through Wails's runtime bridge, which lets front-end code call bound Go methods asynchronously and lets Go code emit events that JavaScript listeners can subscribe to, without the developer hand-rolling an IPC protocol. Compared with Electron, Wails trades a fully consistent, bundled rendering engine for a smaller footprint and Go instead of Node.js as the backend language; teams already invested in a Go codebase, or who want to avoid Node.js entirely, often find this trade favorable. Compared with Go's native GUI toolkits like Fyne, Gio, or Qt bindings, Wails lets a team reuse an existing web front end or web development skill set directly, rather than rebuilding a UI with Go-native widgets, at the cost of depending on a system web view rather than a toolkit that renders identically everywhere. In practice, Wails is used for internal tools, developer utilities, and consumer desktop applications where a team already has web front-end code or expertise and wants a Go backend for system access, performance-sensitive logic, or reuse of existing Go libraries. Its scaffolding CLI generates a starter project wired for popular front-end frameworks, and it supports building native application menus, system tray icons, and file dialogs through its Go API. A known limitation is Wails's reliance on the operating system's installed web view, which on Windows requires the WebView2 runtime to be present — bundled with modern Windows versions but occasionally requiring separate installation on older systems — introducing a dependency that Electron's bundled-browser approach avoids. Teams targeting a broad range of older client machines should verify web view availability as part of their deployment plan rather than assuming universal presence.
Key Features
- Go backend paired with a web-technology front end for the UI
- Renders using the OS's native web view instead of a bundled browser
- Runtime bridge for calling Go functions from JavaScript and back
- Smaller binaries and lower memory footprint than Electron apps
- Scaffolding CLI with templates for React, Vue, and other frameworks
- Go APIs for native menus, system tray icons, and file dialogs
- Cross-platform builds for Windows, macOS, and Linux