# Alacritty — Cross-Platform GPU-Accelerated Terminal Emulator

> Alacritty is a cross-platform, GPU-accelerated terminal emulator written in Rust. Focuses on simplicity and performance — no tabs, no splits, just the fastest terminal rendering on the planet. Configuration via TOML file, works on macOS, Linux, Windows, and BSD.

## Install

Save the content below to `.claude/skills/` or append to your `CLAUDE.md`:

## Quick Use

```bash
# Install
brew install --cask alacritty              # macOS
sudo snap install alacritty --classic      # Linux
scoop install alacritty                    # Windows
cargo install alacritty                    # From source
```

Config `~/.config/alacritty/alacritty.toml`:
```toml
[font]
size = 14.0

[font.normal]
family = "JetBrainsMono Nerd Font"
style = "Regular"

[window]
decorations = "Buttonless"
opacity = 0.95
padding = { x = 8, y = 8 }

[colors.primary]
background = "#1e1e2e"
foreground = "#cdd6f4"

[terminal.shell]
program = "/bin/zsh"
args = ["-l"]
```

## Intro

Alacritty is the fastest terminal emulator in existence. Written in Rust, it uses OpenGL (and now WebGPU-capable via crossfont/glutin) for GPU-accelerated text rendering. Alacritty intentionally has no tabs or splits — it expects you to pair it with tmux or a tiling window manager. Focus on doing one thing well: rendering terminal output as fast as possible.

- **Repo**: https://github.com/alacritty/alacritty
- **Stars**: 63K+
- **Language**: Rust
- **License**: Apache 2.0

## What Alacritty Does

- **GPU rendering** — OpenGL/Metal for text rendering
- **Cross-platform** — macOS, Linux, Windows, FreeBSD
- **TOML config** — everything via `alacritty.toml`
- **Vi mode** — navigate and select text in terminal
- **Search** — incremental regex search
- **Hints** — clickable URLs and custom patterns
- **Live config reload** — edit config, terminal updates instantly
- **Scrollback** — configurable buffer size
- **True color** — 24-bit color support
- **Unicode** — full Unicode and emoji rendering

## Architecture

Rust binary using glutin/winit for windowing and crossfont for font rasterization. Rendering pipeline: parse ANSI escape codes → update grid state → render via OpenGL. Zero-copy where possible for maximum throughput.

## Self-Hosting

Terminal application — install and run.

## Key Features

- Fastest text rendering
- GPU-accelerated
- TOML configuration
- Vi mode navigation
- Live config reload
- True color and font ligatures
- Regex search
- URL hints
- Cross-platform
- Minimal by design

## Comparison

| Terminal | GPU | Tabs | Config | Language |
|---|---|---|---|---|
| Alacritty | OpenGL | No | TOML | Rust |
| Ghostty | Metal/OpenGL | Yes | INI-like | Zig |
| Kitty | OpenGL | Yes | kitty.conf | C+Python |
| WezTerm | OpenGL | Yes | Lua | Rust |
| iTerm2 | Metal | Yes | GUI | ObjC |

## FAQ

**Q: What about the lack of tabs?**
A: Use it with tmux or Zellij. Alacritty's philosophy is to be the best terminal renderer; window management is left to specialized tools.

**Q: Blurry fonts?**
A: On macOS, make sure Retina is properly detected. Set `[env] TERM = "xterm-256color"` and an appropriate font size.

**Q: Compared to Ghostty?**
A: Ghostty is more "batteries included" (native tabs, splits, platform UI); Alacritty is more minimal, faster, and more mature.

## Sources

- Docs: https://alacritty.org
- GitHub: https://github.com/alacritty/alacritty
- License: Apache 2.0

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Source: https://tokrepo.com/en/workflows/alacritty-cross-platform-gpu-accelerated-terminal-emulator-c457becc
Author: AI Open Source