Ratatui Has a Free API: The Rust Framework for Building Terminal Dashboards and Interactive TUI Apps

#ratatui #rust #terminal #tui

Rust is fast. Terminals are everywhere. Ratatui combines both to build terminal UIs that render complex dashboards, charts, and tables at 60+ FPS — all in safe, compiled Rust.

What Is Ratatui?

Ratatui is a Rust library for building terminal user interfaces. It is the actively maintained fork of tui-rs, with a growing ecosystem of widgets, layout tools, and integrations. Build dashboards, monitoring tools, or interactive applications that run in any terminal.

The Free Library

Ratatui is completely free and open source:

Immediate mode rendering: Efficient diff-based terminal updates
Rich widgets: Tables, charts, gauges, sparklines, lists, tabs
Flexible layouts: Constraint-based layout system
Multiple backends: Crossterm, Termion, Termwiz
Styling: Colors, bold, italic, underline, modifiers
Unicode: Full Unicode and emoji support

Quick Start

cargo add ratatui crossterm

Build a dashboard:

use ratatui::{
    prelude::*,
    widgets::{Block, Borders, Gauge, Paragraph, Sparkline},
};

fn ui(frame: &mut Frame, app: &App) {
    let chunks = Layout::default()
        .direction(Direction::Vertical)
        .constraints([
            Constraint::Length(3),
            Constraint::Length(3),
            Constraint::Min(0),
        ])
        .split(frame.area());

    // Title
    let title = Paragraph::new("System Monitor")
        .style(Style::default().fg(Color::Cyan).add_modifier(Modifier::BOLD))
        .block(Block::default().borders(Borders::ALL));
    frame.render_widget(title, chunks[0]);

    // CPU gauge
    let cpu = Gauge::default()
        .block(Block::default().title("CPU").borders(Borders::ALL))
        .gauge_style(Style::default().fg(Color::Green))
        .percent(app.cpu_usage);
    frame.render_widget(cpu, chunks[1]);

    // Sparkline
    let sparkline = Sparkline::default()
        .block(Block::default().title("Network").borders(Borders::ALL))
        .data(&app.network_data)
        .style(Style::default().fg(Color::Yellow));
    frame.render_widget(sparkline, chunks[2]);
}

Why Developers Choose Ratatui

An SRE team needed a monitoring dashboard for their on-call rotation. Web dashboards required a browser and VPN. With Ratatui, they built a terminal dashboard that shows system metrics, alerts, and log tails — accessible via SSH from any device. The compiled binary is 2MB and starts instantly.

Who Is This For?

Rust developers building monitoring and admin tools
SRE/DevOps teams needing SSH-accessible dashboards
CLI tool builders wanting rich interactive interfaces
Developers who love the terminal and want to push its limits

Start Building

Ratatui makes terminal UIs powerful and beautiful. Rust performance meets terminal accessibility.

Need help building terminal tools or monitoring dashboards? I build custom developer tools — reach out to discuss your project.

Found this useful? I publish daily deep-dives into developer tools and APIs. Follow for more.

DEV Community