Tempest

A macOS developer tool built with Electrobun (Bun + native WebView). Tempest provides an integrated workspace with terminal emulation, a built-in browser, code editing, markdown preview, git/PR workflows, and session management -- all in a single native app.

Install

Homebrew (recommended)

brew tap MattFlower/recipes
brew install --cask tempest

Manual download

Grab the latest Tempest.dmg or Tempest.zip from the GitHub Releases page.

Features

• Terminal -- xterm.js with WebGL rendering, backed by Bun.Terminal PTY
• Browser -- Tabbed browsing via system WKWebView with bookmarks
• Editor -- Monaco editor with Vim bindings
• Markdown viewer -- Live-rendered markdown with Mermaid diagram support
• Git & Jujutsu integration -- Diff viewer, VCS status, file staging for both Git and Jujutsu
• PR monitor -- Track and review pull requests
• Session management -- Workspace persistence, session state restore, and terminal scrollback capture
• Workspaces -- Create, archive, and switch between workspaces, each with their own terminals, browser tabs, and sessions. Activity indicators show whether each workspace is idle, working, or waiting for input.
• Ask Claude -- Highlight text in Diff View or VCS View and send it to Claude Code with context automatically included
• Custom scripts -- Define parameterized scripts and run them with a button click
• Command palette -- Quick access to commands (Cmd+Shift+P) and files (Cmd+P), with arrow keys to target left or right pane
• Remote control server -- Optional HTTP server for controlling Tempest remotely, with bearer token auth, a web dashboard, and QR code for easy mobile access

Building Locally

Prerequisites

• macOS
• Bun >= 1.3.11

Setup

# Install dependencies
bun install

# Start in development mode
bun run dev

Common Commands

Command	Description
bun run dev	Build CSS and start the app in dev mode
bun run build:release	Build a release (stable) bundle
bun run build:css	Rebuild Tailwind CSS only
bun test	Run tests

Architecture

Two-process model:

• Bun process (src/bun/) -- Backend: PTY management, session state, file I/O, git operations, RPC handlers
• React webview (src/views/main/) -- Frontend: UI components, state management (Zustand), terminal/browser/editor rendering

The processes communicate over Electrobun's typed RPC bridge.

Tech Stack

• Electrobun 1.16.0
• React 19
• Tailwind CSS 4
• Zustand
• xterm.js 6
• Monaco Editor