GUST

Fast, dependency-free internet speed test & public-IP checker for your terminal.

gust shows your public IP, provider and location, then measures latency, download and upload speed. On an interactive terminal it opens a menu-driven interface with live animated bars, sparklines and a quality grade; piped or with flags it behaves as a classic one-shot command with plain-text or JSON output.

Written in pure Go: no third-party dependencies, just the standard library.

Features

• Public IP, ASN, provider and location (with automatic provider fallback)
• Latency, jitter and a per-sample sparkline
• Download & upload throughput over parallel connections
• Interactive menu — pick a test, tweak settings, all with arrow keys
• watch mode with a rolling speed sparkline
• Quality grade (A+…E) summarising the result
• Persistent defaults in ~/.config/gust/config.json
• Plain-text and JSON output for scripts

Install

Homebrew (macOS):

brew tap Tsunami43/gust https://github.com/Tsunami43/gust
brew trust --cask Tsunami43/gust/gust   # Homebrew 6+ requires trusting third-party taps
brew install --cask Tsunami43/gust/gust
gust -version

With Go (1.22+), on any platform:

go install github.com/Tsunami43/gust/cmd/gust@latest

Or build from source:

git clone https://github.com/Tsunami43/gust.git
cd gust
make build      # or: go build -o gust ./cmd/gust

Usage

Just run it on a terminal to open the interactive menu:

gust

   ██████╗ ██╗   ██╗███████╗████████╗
  ██╔════╝ ██║   ██║██╔════╝╚══██╔══╝
  ██║  ███╗██║   ██║███████╗   ██║
  ██║   ██║██║   ██║╚════██║   ██║
  ╚██████╔╝╚██████╔╝███████║   ██║
   ╚═════╝  ╚═════╝ ╚══════╝   ╚═╝
  internet speed test · vX.X.X

  main menu
  ❯ Full test       latency + download + upload
    Download only   measure download speed
    Upload only     measure upload speed
    Ping            latency and jitter
    Public IP       show network info
    Settings        size, streams, pings
    Quit            exit gust

  ↑↓ move   ↵ select   q back

The interface uses a calm violet colour theme with a gradient word-mark, a ❯ pointer and sparklines — colours are 24-bit and shown on any modern terminal.

A finished full test looks like this:

  ╭─ Network ───────────────────────────────────╮
  │ IP         203.0.113.7                       │
  │ Location   Berlin, Germany                   │
  │ Provider   AS3320 Deutsche Telekom AG        │
  │ Server     TXL · HTTP/2.0 · cloudflare       │
  ╰──────────────────────────────────────────────╯

  ✓ Latency   12.34 ms   · jitter 0.70 ms   ▂▃▁▂▄▁
  ✓ Download  ██████████████████████  94.21 Mbps
  ✓ Upload    ██████████████████████  18.44 Mbps

   A  great   ↓ 94.21 Mbps   ↑ 18.44 Mbps   · 12.34 ms

One-shot & scripting

gust -no-menu          # run a full test without the menu
gust -ip-only          # only show public IP / network info
gust -json             # machine-readable output (for jq & scripts)
gust -no-upload        # skip the upload test
gust -size 100 -streams 8   # heavier test over 8 connections

Watch mode

Repeat the download test on an interval and watch a rolling sparkline:

gust -watch 5s

  16:04:11  ↓    91.20 Mbps  ▅▆▄
  16:04:16  ↓    88.70 Mbps  ▄▅▃▂
  16:04:21  ↓    94.80 Mbps  ▆▇▅▃█

Saving defaults

Change settings interactively in Settings, or save flags as defaults:

gust -size 50 -streams 8 -pings 10 -save-config

Defaults are stored in ~/.config/gust/config.json and reused on every run.

Options

Flag	Default	Description
-ip-only	false	Only show public IP / network info.
-json	false	Output results as JSON.
-watch	0	Repeat the download test on this interval (e.g. 5s).
-no-download	false	Skip the download test.
-no-upload	false	Skip the upload test.
-no-menu	false	Never open the interactive menu.
-no-color	false	Disable coloured / animated output.
-size	25	Data to transfer per test, in MiB.
-streams	4	Parallel connections per test.
-pings	6	Number of latency samples.
-timeout	60s	Overall timeout for a single measurement.
-save-config	false	Save size/streams/pings as defaults and exit.
-version	false	Print version and exit.

Press Ctrl-C to cancel at any time.

Contributing

See CONTRIBUTING.md. In short: Go 1.22+, standard library only, make test and make vet before a PR.

License

MIT