rtop

A beautiful terminal system monitor in the style of top and bpytop, written in Rust with ratatui + crossterm. It renders a live dashboard of CPU, memory, GPU, network, disk, battery & sensors, and a sortable process table — themed with a built-in set of [Catppuccin], Dracula, Nord, and GitHub palettes.

Demo

Features

• Live CPU (global + per-core), memory & swap, GPU, network I/O rates (with private/WAN IP in the header), and disk usage
• Battery status (with cycle count and health), temperature sensors, and fan speeds (where available)
• Sortable, filterable process table with selection, mouse support, per-process details popup (with command line, CPU/memory history graphs), and process kill
• Seven built-in themes (Catppuccin ×4, Dracula, Nord, GitHub Dark) with runtime cycling and optional transparent background
• Sparkline history for CPU, GPU, and network; per-core CPU load, model, and load average
• Block-bar usage chart for memory; disk usage table (colored by fullness)
• In-app settings menu to change refresh rate, theme, transparency, and WAN IP live
• Config file for theme and refresh interval, overridable via CLI flags
• Non-blocking data collection on a background thread — a slow sensor never janks the UI

Install

From source

cargo install --path .

Prebuilt binaries (macOS)

Prebuilt binaries for Apple Silicon (aarch64-apple-darwin) and Intel (x86_64-apple-darwin) are attached to each GitHub release. Download the tarball for your architecture, extract it, and put rtop on your PATH:

tar -xzf rtop-v0.6.0-aarch64-apple-darwin.tar.gz
sudo mv rtop /usr/local/bin/

The binaries are unsigned, so macOS Gatekeeper may quarantine them on first launch. If you see a "cannot be opened" warning, clear the quarantine flag:

xattr -d com.apple.quarantine /usr/local/bin/rtop

Prebuilt binaries (Linux)

Prebuilt x86_64 Linux binaries are attached to each GitHub release in two variants:

• x86_64-unknown-linux-gnu — dynamically linked against glibc, for glibc-based distros (Arch, Ubuntu, Fedora, Debian, etc.)
• x86_64-unknown-linux-musl — statically linked, portable across any Linux distro regardless of installed libc

Download the tarball for your variant, extract it, and put rtop on your PATH:

tar -xzf rtop-v0.8.1-x86_64-unknown-linux-gnu.tar.gz
sudo install -m 755 rtop /usr/local/bin/rtop

Note: the WAN IP feature shells out to curl. Most distros ship it by default, but if the WAN address shows n/a, install curl.

Usage

Run from the repository:

cargo run

Or, once installed:

rtop

CLI flags override config values:

rtop --theme macchiato --interval 500

Flag	Description
--theme	Theme: latte, frappe, macchiato, mocha, dracula, nord, github-dark
--interval	Refresh interval in milliseconds

Keybindings

Key	Action
q	Quit
t	Cycle theme
c / m / p / n	Sort processes by CPU / memory / PID / name
↑ / ↓	Move process selection
k	Open the signal menu (Term / Kill / Interrupt)
f	Filter processes by name, user, or PID
i	Show per-interface network rates
space	Pause / resume live updates
s	Open the settings menu
z	Toggle full-screen process view
Enter	Show details for the selected process
?	Show the help popup
Esc	Close popup / cancel filter
Mouse click	Select the process under the cursor
Mouse scroll	Move process selection

While filtering, type to match process names (case-insensitive), usernames, or PIDs, Enter to apply, Esc to cancel, Backspace to delete.

The sort key and direction (set with c/m/p/n) persist across sessions along with the theme and settings.

Themes

rtop ships with seven built-in themes:

• latte, frappe, macchiato, mocha — Catppuccin
• dracula — Dracula
• nord — Nord
• github-dark — GitHub

Select one at startup with --theme <name>, or press t at any time to cycle through them. The chosen theme is persisted to the config file. Note that the light theme (latte) reads best with transparent = false or a light terminal.

Settings menu

Press s to open the in-app settings menu. Use ↑/↓ to pick a row and ←/→ to change its value; Esc closes it. Changes apply immediately and are persisted to the config file:

Setting	Values
Refresh	100, 250, 500, 1000, 2000, 5000 ms
Theme	latte, frappe, macchiato, mocha, dracula, nord, github-dark
Transparent	on / off (terminal background vs theme bg)
Time	on / off (show the clock in the footer)
Uptime	on / off (show uptime in the footer)
Labels	on / off (show Active/History chart labels)
Sort key	cpu, memory, pid, name
Sort dir	asc / desc
WAN IP	on / off (fetch public IP via the URL below)
WAN URL	endpoint returning your public IP (press Enter to edit)

The active refresh rate is shown in the footer next to the clock and uptime. When WAN IP is enabled, the Network panel header shows private and wan addresses (fetched with curl from the configured URL).

Config

Settings live in a TOML file at the platform config directory (via the dirs crate):

Platform	Path
macOS	~/Library/Application Support/rtop/config.toml
Linux	~/.config/rtop/config.toml
Windows	%APPDATA%\rtop\config.toml

Format:

[theme]
flavor = "mocha"        # latte | frappe | macchiato | mocha | dracula | nord | github-dark

[general]
interval_ms = 500       # sampling + render tick, in milliseconds
transparent = true      # use the terminal's background (false = theme bg)
show_time = true        # show the clock in the footer
show_uptime = true      # show system uptime in the footer
show_labels = true      # show Active/History chart labels
sort_key = "cpu"        # cpu | memory | pid | name
sort_dir = "desc"       # asc | desc
wan_enabled = false     # fetch and display the public (WAN) IP
wan_url = "https://echo.johansen.foo/api/ip"  # endpoint returning your public IP

The file is created automatically when you cycle themes (t).

Platform support

Feature	macOS	Linux	Windows
CPU, memory & swap	✓	✓	✓
Network & disk I/O	✓	✓	✓
Processes (list/sort/kill)	✓	✓	✓*
Battery	✓	✓	✓
Temperatures	✓	✓*	✓*
GPU utilization & memory	✓	✓	—
Fan speed	✓	✓	—

* — provided by the cross-platform sysinfo backend; platform-specific behavior may vary.

macOS is the reference platform and is fully supported, including GPU (IOKit PerformanceStatistics) and fan speed (SMC via smc-lib).

Linux supports GPU metrics through NVIDIA NVML or the DRM sysfs interface (AMD/Intel) and fan speed through hwmon. Windows supports CPU, memory, network, disk, battery, temperatures, and processes through sysinfo, but GPU and fan metrics are not yet implemented and render as n/a. Missing sensors degrade gracefully rather than crashing.